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Studies of Highly Reactive Biradical and Cation Radicals

Research Project

Project/Area Number 06044014
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionJoint Research
Research InstitutionTohoku University

Principal Investigator

MIYASHI Tsutomu  Tohoku University, Graduate School of Science, Professor, 大学院・理学研究科, 教授 (20004442)

Co-Investigator(Kenkyū-buntansha) MARIANO P.S.  メリーランド大学, 化学科, 教授
MCBRIDE J.Michael  Yale University, Department of Chemistry, スターリング化学実験室, 教授
HILINSKI Edwin.F.  The Florida State University, Deparment of Chemistry, Associate Professor, 化学科, 助教授
DINNOCENZO J  ローチェスター大学, 化学科, 助教授
GOODMAN Joshua.L.  University of Rochester, Deparment of Chemistry, Associate Professor, 化学科, 助教授
WAGNER Peter J.  Michigan State University, Deparment of Chemistry, Professor, 化学科, 教授
BERSON J.A.  エール大学, 化学科, 教授
AKIYAMA Kimio  Tohoku University, Institute for Chemical Reaction Science, Associate Proffesor, 反応研, 助教授 (10167851)
SUZUKI Takanori  Hokkaido University, Graduate School of Science, Associate Professor, 理学部, 助教授 (70202132)
TAKAHASHI Yasutake  Tohoku University, Graduate School of Science, Associate, 大学院・理学研究科, 助手 (70197185)
IKEDA Hiroshi  Tohoku University, Graduate School of Science, Associate, 大学院・理学研究科, 助手 (30211717)
MARIANO Patrick S.  University of Maryland, Department of Chemistry and Biochemistry, Professor
DINNOCENZO Joseph P.  University of Rochester, Deparment of Chemistry, Associate Professor
BERSON Jerome A.  Yale University, Deparment of Chemistry, Professor
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥5,300,000 (Direct Cost: ¥5,300,000)
Fiscal Year 1995: ¥2,800,000 (Direct Cost: ¥2,800,000)
Fiscal Year 1994: ¥2,500,000 (Direct Cost: ¥2,500,000)
KeywordsBiradical / Cation Radical / Back Electron Transfer / Organic Photochemistry / Photoinduced Electron Transfer / Reaction Mechanism / Laser Flash Photolysis / Photoacousic Calorimetry / Solid State / 光音響法
Research Abstract

We have studied the relationship between biradical (BR) and cation radical(CR)intermediates in the photoinduced electron-tranfer(PET)skeletal rearrangement of organic compounds. In general, a nondistonic CR of a donor substrate generated by PET from the excited state of sensitizer (A)can undergo the bond formation or bond cleavage to give a more stable distonic CR intermediates (I^<・+>). Although free distonic CRs have been often observed spectroscopically and/or captured by a trapping reagent such as molecular oxygen or alcohol, reactions of a distonic CR in an ion pair [I^<・+>/A^<・->] have not been well understood yet. There are two possibilities for the decay of a distonic CR intermediate. One is back electron transfer (BET) from A^<・-> to give a singlet or triplet BR intermediate, which give final product (s) by the bond cleavage or formation. The other one is an alternative possible sequence, i.e., bond cleavage or formation in a CR stage followed by BET.In order to know which pro … More cess is operative, we use two complementary laser techniques, time-resolved absorption spectroscopy for the direct observation of CR and BR intermediates and time-resolved photoacoustic calorimetry for the determination of energy of [I^<・+>/A^<・->]. As result, we found three PET reactions that proceed through both CR and BR intermediates. The first is the PET degenerate Cope rearrangement of 2,5-diaryl-1,5-hexadiene, which proceeds in a CR cyclization-BR cleavage mechanism through 1,4-diarylcyclohexa-1,4-diyl CR and 1,4-diarylcyclohexa-1,4-diyl BR.The second example is the degenerate methylenecyclopropane rearrangement of 2,2-diarylmethylenecyclopropane induced by PET,which involves a trimethlenemethane CR (TMM^<・+>) and corresponding BR (TMM). The last case is the generation of singlet and triplet tetramethyleneethane BRs by cyclization of 5,5-dimethy1-2,3-bis (1-phenylvinyl) cyclopentadiene CR.
Those three PET reactions provided an intriguing conclusion that BET in an ion pair is an important key process which connects CR chemistry with BR chemistry. This conclusion is quite noteworthy since, up to the present, BET was usually considered as an energy wasting process. Less

Report

(2 results)
  • 1995 Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (158 results)

All Other

All Publications (158 results)

  • [Publications] C.Sato: "New aspects on fluorescence quenching by molecular oxygen. 2." J.Phys.Chem.99. 16925-16931 (1995)

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  • [Publications] Hiroshi Ikeda: "Striking contrast between photoinduced and non-photoinduced electrontransfer reactions of 1,4-diphenyl-2,3-diazabicyclo [2,2,2] oct-2-ene." J.Chem.Soc.,Chem.Commun.---. 297-298 (1994)

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  • [Publications] Yasutake Takahashi: "Cycloreversion of arene endoperoxides induced by electron transfer." J.Chem.Soc.,Chem.Commun.---. 13-14 (1994)

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  • [Publications] Yasutake Takahashi: "Triplet-state electron-transfer reactions of phenylcyclopropane with quinones." J.Chem.Soc.,Chem.Commun.---. 1127-1128 (1994)

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  • [Publications] Yasutake Takahashi: "Electron-transfer induced intramolecular [2+2] cycloaddition of 2,6-diarylhepta-1,6-dienes." Tetrahedron Lett.35. 3953-3956 (1994)

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  • [Publications] Yasutake Takahashi: "Electron transfer induced isomerization of cis,trans-and trans,trans-1,4-diphenyl-1,3-butadiene." Tetrahedron Lett.35. 5681-5684 (1994)

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  • [Publications] Yasutake Takahashi: "Stepwise but potentially stereoselective intramolecular [2+2] cycloaddition via 1,4-cation radical intermediates." J.Chem.Soc.,Chem.Commun.---. 521-522 (1995)

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  • [Publications] Yasutake Takahashi: "Photoinduced skeletal rearrangement of 1,1-diphenylspiropentanes." Tetrahedron Lett.36. 5207-5210 (1995)

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  • [Publications] Yasutake Takahashi: "Electron-transfer photochemistry of 2,3-diphenyl-1,3-butadiene." Res.Chem.Intermed.21. 765-775 (1995)

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  • [Publications] Yasutake Takahashi: "Generation of an o-xylylene : electrocyclization of 1,2-bis (1-phenylivinyl) benzene promoted by photoinduced electron transfer." J.Chem.Soc.,Chem.Commun.---. 1749-1750 (1995)

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  • [Publications] Yasutake Takahashi: "Photoinduced electron-transfer reactions of 2,7-diarylocta-1,7-dienes and 2,8-diarylnona-1,8-dienes." Tetrahedron Lett.36. 1889-1892 (1995)

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  • [Publications] Yasutake Takahashi: "Photoinduced skeletal rearrangement of 1,1-diarylspiropentanes." J.Chem.Soc.,Perkin Trans 1.(印刷中). ------- (---)

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  • [Publications] Yasutake Takahashi: "Phenylcyclopropane cation radical revisited : generation,direct observation,and determination of the rates of nucleophilic capture." Tetrahedron Lett.(印刷中). ------- (---)

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  • [Publications] Takanori Suzuki: "An absolute asymmetric synthesis of the [2+2] cycloadduct via single crystal-to-single crystal transformation by charge-transfer excitation of solid-state molecular complexes composed of arylolefins and bis [1,2,5] thiadiazolotetracyanoquinodimethane." J.Am.Chem.Soc.116. 2793-2803 (1994)

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  • [Publications] Takanori Suzuki: "2- (Thiopyran-4′-ylidene) 1,3-dithioles fused with thiophene units : intramolecular S・・・S interaction affecting the redox properties and molecular geometries." J.Chem.Soc.,Chem.Commum.---. 1431-1432 (1994)

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  • [Publications] Masatoshi Hirayama: "The π-trianion radical of 2,3,6,7-tetracyanobenzo [1,2-b : 4,5-b′] bisdithiole-4,8-dione,Observation of ESR with ^<13>C-Satellites in Natural Abundance" Chem.Lett.---. 511-512 (1995)

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  • [Publications] Masatoshi Hirayama: "ESR of the trianion and anion radicals of benzo [g] [1,2,5] thiadiazolo [3,4-b] quinoxaline-5,10-dione and its selenium analogue" Chem.Lett.---. 837-838 (1995)

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  • [Publications] Masatoshi Hirayama: "ESR of the π-radical formed by photoreduction of bis (1,2,5-selena-diazolo) tetracyanoquinodimethane in methanol. Observation of a large ^<77>Se Hfs" Chem.Lett.---. 1021-1022 (1995)

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  • [Publications] Masatoshi Hirayama: "ESR of the anion radical of 2,6-dithioxobenzo [1,2-d : 4,5-d′] bis [1,3] -dithiole-4,8-dione.Observation of the Satellites of ^<17>O,^<13>C,and ^<33>S and the second-generation satellites due to both ^<13>C and ^<33>S in Natural Abundance" Bull.Chem.Soc.Jpn.68. 3337-3339 (1995)

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  • [Publications] Takanori Suzuki: "Weak intermolecular interaction in crystal affecting the recognition properties and the solid-state reactivity" J.Synth.Org.Chem.,Jpn.53. 403-412 (1995)

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  • [Publications] Takanori Suzuki: "Photoreactions of crystalline charge-transfer complexes" Pure Appl.Chem.68. in press (1996)

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  • [Publications] Kazuko Takahashi: "Novel Amphoteric 2,5-Furoquinonide-Containing p-Terphenoquinone Analogues Giving Both a Stable Radical Anion and a Stable Radical Cation." Chem.Lett.---. 863-866 (1994)

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  • [Publications] Kimio Akiyama: "Spin polarization conservation during intramolecular triplet-triplet energy transfer studied by time-resolved EPR spectroscopy." J.Am.Chem.Soc.116. 5324-5327 (1994)

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  • [Publications] Kimio Akiyama: "Spin polarization Transfer during Intramolecular T-T Energy Transfer as Studied Time-Resolved EPR Spectroscopy" Mol.Phys.83. 1091-1097 (1994)

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  • [Publications] Seigo Yamauchi: "Fluorescence studies on the photo-induced ligation in the excited singlet state of magnesium tetraphenylporphine." Chem.Phys.Lett.232. 121-126 (1994)

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  • [Publications] Akio Katsuki: "Spin-orbit coupling electron epin polirization observed in photosensitized electron transfer reactions between dyes and p-quinones." J.Am.Chem.Soc.116. 12065-12066 (1994)

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  • [Publications] Seigo Yamauchi: "The Lowest Excited Triplet States of Lanthanide Bisphthalocyanine Complexes Studied by Time Resolved Electron Paramagnetic Reconance." Mol.Phys.83. 335-344 (1994)

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  • [Publications] Takashi Ehara: "Effects of Geometry and Hydrogen Bonding on the Excited Triplet States of 4-Nitropyridine N-oxide and Derivatives." J.Phys.Chem.99. 2292-2295 (1995)

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  • [Publications] Keiji Okada: "Preparations and Spin-spin Interactions of 1,3-Bis (2′,6′-diphenylpyridiny 1-4′-y1) benzene and Its Analogue." Tetrahedron Lett.36. 6689-6692 (1995)

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  • [Publications] Keiji Okada: "Preparations and Spin-spin Interactions of 1,8-Bis (2′,6′-diphenylpyridiny 1-4′-y1) anthracene." Tetrahedron Lett.36. 6693-6696 (1995)

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  • [Publications] Ryuji Hanaishi: "Observation of Spin-correlated Radical Pairs via Two-dimentional EPR Nutation Spectroscopy." J.Chem.Phys.103. 4819-4872 (1995)

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  • [Publications] Ryuji Hanaishi: "Two-dimentinal Fourier Transform EPR Nutation Spectroscopy of Spincorrelated Radical Pairs." J.Magn,Reson.116. 196-205 (1995)

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  • [Publications] Akiko Katsuki: "Echo FT-EPR Study on the photochemical Reduction and Oxidation Reactions of 2,5-di-t-Buty1-1,4-benzoquinone and 2,5-di-t-Butylhydroquinone by Xanthene Dyes." Bull.Chem.Soc.Jpn.68. 3383-3389 (1995)

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  • [Publications] Kimio Akiyama: "Time-resolved and Fourier Transform EPR Studies of Type I Photochemical Reaction. Direct Determination of Kinetic Parameters of C-C-Bond Cleavage." Res.Chem.Intermed.,. (in press.). ------- (---)

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  • [Publications] Kimio Akiyama: "Origin of an Absorptive Electron spin Polariczation Observed in Photochemical Hydrogen Abstraction Reaction by Benzophenone Derivatives. CW and Pulsed EPR Studies." J.Phys.Chem.,. (in press.). ------- (---)

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  • [Publications] Tatsuya Miyamoto: "Intramolecular Singlet and Triplet Eximer States of Qunoxaline-annelated Dimers." Chem.Phys.Lett.,. (in press.). ------- (---)

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  • [Publications] Matthew H.J.Cordes: "Stereochemistry of a cyclopropanone by crystal structure analysis. The exo-configuration of the Diels-Alder adducts of cyclopropenone and 1,3-diphenylisobenzofuran appears to be stabilized relative to the endo by an attractive ether-carbonyl interaction." J.Am.Chem.Soc.116. 11161-11162 (1994)

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  • [Publications] Jerome A.Berson: "Diradicals : conceptual,inferential,and direct methods for the study of chemical reactions." Science. 266. 1338-1339 (1994)

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  • [Publications] Tania Elaine Wessel: "Stabilization of a putive cycclohexane-1,4-dil intermediate slicits an antrafacial Cope rearrangement via a stepwise mechansim. Pyrolysis of (R,E) -5-methyl-1,2,6-octatriene to 4-methyl-3-methylene-1,5-heheptadiene." J.Am.Chem.Soc.116. 495-565 (1994)

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  • [Publications] Weston Thatcher Borden: "Violations of Hund's Rule in Non-Kekule Hydrocarbons : Theoretical Prediction and Experimental Verification." Acc.Chem.Res.27. 109-116 (1994)

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  • [Publications] Peter J.Wagner: "Acetone sensitized intramolecular ortho photocyclization of substituted 4-phenoxybut-1-enes and 5-phenoxypent-1-enes." Tetrahedron Lett.36. 5135-5138 (1994)

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  • [Publications] Robert P.Smart: "Regioselectivity in intramolecular cycloaddition of double bonds to triplet acylbenzenes. II Effects of substituents meta to the tether." Tetrahedron Lett.36. 5131-5134 (1994)

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  • [Publications] Peter.J.Wagner: "Chiral auxiliaries promote both diasteroselective cycloadditions and kinetic resolutions of products in the ortho photocycloaddition of double bondes to benzene rings." J.Am.Chem.Soc.116. 10827-10828 (1994)

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  • [Publications] Peter.J.Wagner: "Photocyclization of 2,4,6,2',4',6'-Hexaalkylbenzils." J.Am.Chem.Soc.117. 7619-7629 (1995)

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  • [Publications] Peter.J.Wagner: "Photoinduced radical cleavage of acylphenyl halides : Different mechansims for C-I and C-Br Bonds." J.Am.Chem.Soc.116. 10284-10285 (1994)

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  • [Publications] Kung-Lung Cheng: "Biradical rearrangements during intramolecular cycloaddition of double bonds to triplet benzenes." J.Am.Chem.Soc.116. 7945-7946 (1994)

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  • [Publications] Peter.J.Wagner: "The regioselectivity of internal hydrogene abstraction by triplet o-tertamylbenzophenone." J.Am.Chem.Soc.116. 589-596 (1994)

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  • [Publications] Thomas A.Zona: "Stereospecific Hydrogen Rearrangement of a 1,4 Cation Radical." J.Am.Chem.Soc.117. 5879-5880 (1995)

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  • [Publications] M.I.Khan: "Picosecond Optical Grating Calorimetry of Singlet Methylene in Benzene." J.Am.Chem.Soc.117. 6635-6636 (1995)

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  • [Publications] Bradley R.Arnold: "Dynamics of Interconversion of Contact and Solvent-Separated Radical-Ion Pairs." J.Am.Chem.Soc.117. 4399-4400 (1995)

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  • [Publications] Edward J.Dix: "Protonation of Diarylcarbenes by Alcohols : The Importance of Ion Pair Dynamics." J.Phys.Chem.98. 12609-12612 (1994)

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  • [Publications] M.I.Khan: "Picosecond Optical Grating Calorimetry of Diradicals : Singlet-Triplet Separation in m-Naphthoquinomethane." J.Am.Chem.Soc.116. 10342-10343 (1994)

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  • [Publications] J.P.Dinnocenzo: "The cation radical vinylcyclopropane.fwdarw.cyclopentene rearrangement : reaction mechanism and periselectivity." Tetrahedron Lett.36. 7415-7418 (1995)

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  • [Publications] S.B.Karki: "On the mechanism of amine oxidations by P450." Xenobiotica. 25. 711-724 (1995)

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  • [Publications] Sason Shaik: "Reactivity Paradigms : Transition State Structure,Mechanisms of Barrier Formation,and Stereospecificity of Nucleophilic Substitutions on.sigma.-Cation Radicals." J.Am.Chem.Soc.117. 3205-3222 (1995)

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  • [Publications] S.B.Karki: "TI Mechanism of Oxidative Amine Dealkylation of Substituted N.N-Dimethylanilines by Cytochrome P-450 : Application of Isotope Effect profiles." J.Am.Chem.Soc.117. 3657-3664 (1995)

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  • [Publications] Ung Chan Yoon: "Novel and Efficient Azomethine Ylide Forming Photoreactions of N- (Silylmethyl) phthalimides and Related Acid and Alcohol Derivatives." J.Am.Chem.Soc.117. 2698-2710 (1995)

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  • [Publications] Ung Chan Yoon: "Investigations of Novel Azomethine Ylide-Forming Photoreactions of N-Silylmethylimides." J.Org.Chem.60. 2353-2360 (1995)

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  • [Publications] Ung Chan Yoon: "Photoinduced electron transfer chemistry of amines and related electron donors." Adv.Electron Transfer Chem.4. 117-205 (1994)

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  • [Publications] Xiaodong Lin: "A cephalotaxine synthesis founded on a mechanistically interesting,quasi-biomimetic strategy." J.Am.Chem.Soc.116. 9791-9792 (1994)

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  • [Publications] Yuan Xu: "Location of the Catalytic Site for Phosphoenolpyruvate Formation within the primary Structure of Clostridium symbiosum Pyruvate Phosphate Dikinase. 1. Identification of an Essential Cysteine by Chemical Modification with [1-14C] Bromopyruvate and Site-Directed Mutagenesis." Biochemistry. 34. 2181-2187 (1995)

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  • [Publications] Susan E.Hoegy: "Indolizidine and quinolizidine ring formation in the SET-photochemistry of .alpha.-silyl amines." Tetrahedron Lett.35. 8319-8322 (1994)

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  • [Publications] Jong-Man Kim: "Flavin Chemical Models of Monoamine Oxidase Inactivation by Cyclopropylamines,. alpha.-Silylamines,and Hydrazines." J.Am.Chem.Soc.117. 100-105 (1995)

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      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ung Chan Yoon: "Exploratory study of photocyclization reactions of N- (trimethylsilylmethylthioalkyl) phthalimides." Bull.Korean Chem.Soc.15. 154-161 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Xiaoming Zhang: "Dynamics of a-CH deprotonation and a-desilylation reactions of tertially aminecation radicals" J.Am.Chem.Soc.116. 4211-4220 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Seock Kyu Khim: "A novel method for synthesis of functionalized piperidines." Tetrahedron Lett.35. 999-1002 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.Fasani: "SET Photochemical Reactions between 1,4-Naphthalenedicarbonitrile and Benzylic Donors. Medium Effects." J.Org.Chem.59. 829-835 (1994)

    • Description
      「研究成果報告書概要(和文)」より
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      1995 Final Research Report Summary
  • [Publications] Jack Saltiel: "Photocycloaddition of 9,10-Dichloroanthracene to 2,5-Dimethy1-2,4-hexadiene. The Singlet Pathway for [4+2] -Adduct Formation in Benzene." J.Am.Chem.Soc.117. 9129-9138 (1995)

    • Description
      「研究成果報告書概要(和文)」より
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      1995 Final Research Report Summary
  • [Publications] William M.McGowan: "Competitive Bond Homolysis and Intersystem Crossing in the Picosecond Time Regime. Photodissociation of 9-Bromo-and 9-Chlorofluorene in Cyclohexane." J.Am.Chem.Soc.115. 9019-9025 (19945)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Lev R.Ryzhkov: "Low-Temperature Reactions in Single Crystals of Two Polymorphs of the Polycyclic Nitramine 15N-HNIW." J.Phys.Chem.100. 163-169 (1996)

    • Description
      「研究成果報告書概要(和文)」より
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      1995 Final Research Report Summary
  • [Publications] Chikako Sato: "New aspects on fluorescence quenching by nolecular oxygen.2." J.Phys.Chem. 99. 16925-16931 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Hiroshi Ikeda: "Striking Contrast between Photoinduced and Non-photoinduced Electron-transfer Reactions of 1,4-Diphenyl-2,3-diazabicyclo[2.2.2]oct-ene." J.Chem.Soc., Chem.Commun.297-298 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Cycloreversion of arene endoperoxides induced by electron transfer." J.Chem.Soc., Chem.Commun.13-14 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Triplet-state electron-transfer reactions of phenylcyclopropane with quinones" J.Chem.Soc., Chem.Commun.1127-1128 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Electron-transfer induced intramolecular[2+2]cycloaddition of 2,6-diarylhepta-1,6-dienes." Tetrahedron Lett.35. 3593-3596 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Electron transfer induced isomerization of cis, trans-and trans, trans-1,4-diphenyl-1,3-butadiene." Tetrahedron Lett.35. 5681-5684 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Stepwise but potentially stereoselective intramolecular[2+2]cycloaddition via 1,4-cation radical intermediates." J.Chem. Soc., Chem. Commun.521-522 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Photoinduced skeletal rearrangement of 1,1-diphenylspiropentanes." Tetrahedron Lett.36. 5207-5210 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Electron-transfer photochemistry of 2,3-diphenyl-1,3-butadiene." Res. Chem. Intermed.21. 765-775 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Generation of an o-xylylene : electrocyclization of 1,2-bis (1-phenylvinyl) benzene promoted by photoinduced electron transfer." J.Chem. Soc. Commun.1749-1750 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Photoinduced electron-transfer reactions of 2,7-diarylocta-1,7-dienes and 2,8-diarylnona-1,8-dienes." Tetrahedron Lett.36. 1889-1892 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Photoinduced skeletal rearrangement of 1,1-diarylspiropentanes." J.Chem.Soc., Perkin Trans 1., in press.

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yasutake Takahashi: "Phenylcyclopropane cation radical revisited : generation, direct obervation, and determination of the rates of nucleophilic capture" Tetrahidron Lett., in press.

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Takanori Suzuki: "An absolute asymmetric synthesis of the [2+2] cycoadduct via single crystal-to-single crystal transformation by charge-transfer excitation of solid-state molecular complexes composed of arylolefins and bis[1,2,5]thiadiazolotetracyanoquinodimethane." J.Am.Chem.Soc.116. 2793-2803 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Takanori Suzuki: "2-(Thiopyran-4'-yliden)-1,3-dithioles fused with thiophene units : Intramolecular S・・・S interaction affecting the redox properties and molecular geometries." J.Chem.Soc., Chem.Commun.1431-1432 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Masatoshi Hirayama: "The p-trianion radical of 2,3,6,7-tetracyanobenzo [1,2-b : 4,5-b']bisdithiole-4,8-dione. Observation of ESR with 13C-Satellites in Natural Abundance." Chem.Lett. 511-512 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Masatoshi Hirayama, Toshitaka Terasaka, Manabu Itasaka, Takanori Suzuki, Yoshiro Yamashita, Tsutomu Miyashi: "ESR of the trianion and anion radicals of benzo [g][1,2,5]thiadiazolo[3,4-b]-quinoxaline-5,10-dione and its selenium analogue." Chem.Lett.837-838 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Masatoshi Hirayama: "ESR of the p-radical formed by photoreduction of bis(1,2,5-selenadiazolo) tetracyanoquinodimethane in methanol. Observation of a large 77Se Hfs." Chem.Lett.1021-1022 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Masatoshi Hirayama: "ESR of the anion radical of 2,6-dithioxobenzo[1,2-d : 4,5-d']bis[1,3]dithiole-4,8-dione. Observation of the Satellites of ^<12>C, and ^<17>O,^<33>S and the second-generation satellites due to both ^<13>C and ^<33> S in Natural Abundance." Bull. Chem. Soc. Jpn.68. 3337-3339 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Takanori Suzuki: "Weak intermolecular interaction in crystal affecting the recognition properties and the solid-state reactivity." J.Synth. Org. Chem., Jpn.53. 403-412 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Takanori Suzuki: "Photoreactions of crystalline charge-transfer complexes." Pure Appl. Chem., in press.68. (1996)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Kazuko Takahashi: "Novel Amphoteric 2,5-Furoquinonide-Containing p-Terphenoquinone Analogues Giving Both a Stable Radical Anion and a Stable Radical Cation." Chem. Lett.863-866 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Kimio Akiyama: "Spin Polarization Conservation during Intramolecular Triplet-Triplet Energy Transfer Studied by Time-Resolved EPR Spectroscopy." J.Am. Chem. Soc.116. 5324-5327 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Kimio Akiyama: "Spin Polarization Transfer during Intramolecular T-T Energy Transfer as Studied Time-Resolved EPR Spectroscopy." Mol. Phys.83. 1091-1097 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Seigo Yamaushi: "Fluorescence studies on the photo-induced ligation in the excited singlet state of magnesium tetraphenylporphine." Chem. Phys. Lett.232. 121-126 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Akio Katsuki: "Spin-Orbit Coupling Induced Electron Spin Polarization Observed in Photosensitized Electron Transfer Reaction between Xanthene Dyes and p-Quinones." J.Am. Chem. Soc.116. 12065-12066 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Seigo Yamaushi: "The Lowest Excited Triplet States of Lanthanide Bisphthalocyanine Complexes Studied by Time Resolved Electron Paramagnetic Resonance." Mol. Phys.83. 335-344 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Takashi Ehara: "Effects of Geometry and Hydrogen Bonding on the Excited Triplet States of 4-Nitropyridine N-oxide and Derivatives." J.Phys. Chem.99. 2292-2295 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Keiji Okada: "Preparations and Spin-Spin Interactions of 1,3-Bis(2', 6'-diphenylpyridinyl-4'-yl)benzene and Its Analogue." Tetrahedron Lett.36. 6689-6692 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Keiji Okada: "Preparations and Spin-Spin Interactions of 1,8-Bis(2', 6'-diphenylpyridinyl-4'-yl)anthracene." Tetrahedron Lett.36. 6693-6696 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Ryuji Hanaishi: "Observation of Spin-correlated Radical Pairs via Two-dimentional EPR Nutation Spectroscopy." J.Chem. Phys.103. 4819-4822 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Ryuji Hanaishi: "Two-dimentinal Fourier Transform EPR Nutation Spectroscopy of Spin-correlated Radical Pairs." J.Magn. Reson.116. 196-205 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Akio Katsuki: "Echo FT-EPR Study on the Photochemical Reduction and Oxidation Reactions of 2,5-di-t-Butyl-, 4-benzoquinone and 2,5-di-t-Butylhydroquinone by Xanthene Dyes." Bull. Chem. Soc. Jpn.68. 3383-3389 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Kimio Akiyama: "Time-resolved and Fourier Transform EPR Studies of Type I Photochemical Reaction. Direct Determination of Kinetic Parameters of C-C Bond Cleavage." Res. Chem. Intermed.22. 103-113 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Kimio Akiyama: "Origin of an Absorptive Electron Spin Polarization Observed in Photochemical Hydrogen Abstraction Reaction by Benzophenone Derivatives. CW and Pulsed EPR Studies." J.Phys. Chem.100. 180-183 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Tatsuya Miyamoto: "Intramolecular Singlet and Triplet Eximer States of Qunoxaline-annelated Dimers." Chem. Phys. Lett., in press.

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Matthew H.J.Cordes: "Stereochemistry of a Cyclopropanone by Crystal Structure Analysis. The Exo Configuration of the Diels-Alder Adduct of Cyclopropenone and 1,3-Diphenylisobenzofuran Appears To Be Stabilized Relative to the Endo by an Attractive Ether-Carbonyl Interaction." J.Am. Chem. Soc.116. 11161-11162 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Jerome A.Berson: "Diradicals : conceptual, inferential, and direct methods for the study of chemical reactions." Science. 266. 1338-1339 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Tania Elaine Wessel: "Stabilization of a putative cyclohexane-1,4-diyl intermediate elicits an antarafacial Cope rearrangement via a stepwise mechanism. Pyrolysis of(R,E)-5-methyl-1,2,6-octatriene to 4-methyl-3-methylene-1,5-heptadiene." J.Am. Chem. Soc.116. 495-505 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Weston Thatcher Borden: "Violations of Hund's Rule in Non-Kekule Hydrocarbons : Theoretical Prediction and Experimental Verification." Acc. Chem. Res.27. 109-116 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Peter J.Wagner: "Acetone sensitized intramolecular ortho photocyclization of substituted 4-phenoxybut-1-enes and 5-phenoxypent-1-enes." Tetrahedron Lett.36. 5135-5138 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Robert P.Smart: "Regioselectivity in intramolecular cycloaddition of double bonds to triplet acylbenzenes. II.Effects of substituents meta to the tether." Tetrahedron Lett.36. 5131-5134 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Peter J.Wagner: "Chiral Auxiliaries Promote both Diastereoselective Cycloaddition and Kinetic Resolution of Products in the Ortho Photocycloaddition of Double Bonds to Benzene Rings." J.Am. Chem. Soc.116. 10827-10828 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Peter J.Wagner: "Photocyclization of 2,4,6,2', 4', 6'-Hexaalkylbenzils." J.Am. Chem. Soc.117. 7619-7629 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Peter J.Wagner: "Photoinduced Radical Cleavage of Iodobenzophenones." J.Phys. Chem.99. 7388-7394 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Peter J.Wagner: "Photoinduced Radical Cleavage of Acylphenyl Halides : Different Mechanisms for C-I and C-Br Bonds." J.Am. Chem. Soc.116. 10284-10285 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Kung-Lung Cheng: "Biradical Rearrangements during Intramolecular Cycloaddition of Double Bonds to Triplet Benzenes." J.Am. Chem. Soc.116. 7945-7946 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Peter J.Wagner: "The Regioselectivity of Internal Hydrogen Abstraction by Triplet o-tert-Amylbenzophenone." J.Am. Chem. Soc.116. 589-596 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Thomas A.Zona: "Stereospecific Hydrogen Rearrangement of a 1,4 Cation Radical." J.Am. Chem. Soc.117. 5879-5880 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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  • [Publications] M.I.Khan: "Picosecond Optical Grating Calorimetry of Singlet Methylene in Benzene." J.Am. Chem. Soc.117. 6635-6636 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Bradley R.Arnold: "Dynamics of Interconversion of Contact and Solvent-Separated Radical-Ion Pairs." J.Am. Chem. Soc.117. 4399-4400 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Edward J.Dix: "Protonation of Diarylcarbenes by Alcohols : The Importance of Ion Pair Dynamics." J.Phys. Chem.98. 12609-12612 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] M.I.Khan: "Picosecond Optical Grating Calorimetry of Diradicals : Singlet-Triplet Separation in m-Naphthoquinomethane." J.Am. Chem. Soc.116. 10342-10343 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] J.P.Dinnocenzo: "The cation radical vinycyclopropane. fwdarw. cyclopentene rearrangement : reaction mechanism and periselectivity." Tetrahedron Lett.36. 7415-7418 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] S.B.Karki: "On the mechanism of amine oxidations by P450." Xenobiotica. 25. 711-724 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Sason Shaik: "Reactivity Paradigms : Transition State Structure, Mechanisms of Barrier Formation, and Stereospecificity of Nucleophilic Substitutions on .sigma.-Cation Radicals." J.Am. Chem. Soc.117. 3205-3222 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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  • [Publications] S.B.Karki: "TI Mechanism of Oxidative Amine Dealkylation of Substituted N,N-Dimethylanilines by Cytochrome P-450 : Application of Isotope Effect Profiles." J.Am. Chem. Soc.117. 3657-3664 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Ung Chan Yoon: "Novel and Efficient Azomethine Ylide Forming Photoreactions of N-(Silylmethyl) phthalimides and Related Acid and Alcohol Derivatives." J.Am. Chem. Soc.117. 2698-2710 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Ung Chan Yoon: "Investigations of Novel Azomethine Ylide-Forming Photoreactions of N-Silylmethylimides." J.Org. Chem.60. 2353-2360 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Ung Chan Yoon: "Photoinduced electron transfer chemistry of amines and related electron donors." Adv. Electron Transfer Chem.4. 117-205 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Xiaodong Lin: "A Cephalotaxine Synthesis Founded on a Mechanistically Interesting, Quasi-biomimetic Strategy." J.Am. Chem. Soc.116. 9791-9792 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Yuan Xu: "Location of the Catalytic Site for Phosphoenolpyruvate Formation within the Primary Structure of Clostridium symbiosum Pyruvate Phosphate Dikinase. 1. Identification of an Essential Cysteine by Chemical Modification with [1-14C]Bromopyruvate and Site-Directed Mutagenesis." Biochemistry. 34. 2181-2187 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
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      1995 Final Research Report Summary
  • [Publications] Susan E.Hoegy: "Indolizidine and quinolizidine ring formation in the SET-photochemistry of.alpha.-silyl amines." Tetrahedron Lett.35. 8319-8322 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Jong-Man Kim: "Flavin Chemical Models for Monoamine Oxidase Inactivation by Cyclopropylamines, .alpha.-Silylamines, and Hydrazines." J.Am. Chem. Soc.117. 100-105 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Ung Chan Yoon: "Exploratory study of photocyclization reactions of N-(trimethylsilylmethylthioalkyl) phthalimides." Bull. Korean Chem. Soc.15. 154-161 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Xiaoming Zhang: "Dynamics of .alpha.-CH Deprotonation and .alpha.-Desilylation Reactions of Tertiary Amine Cation Radicals." J.Am. Chem. Soc.116. 4211-4220 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Seock Kyu Khim: "A novel method for synthesis of functionalized piperidines." Tetrahedron Lett.35. 999-1002 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] E.Fasani: "SET Photochemical Reactions between 1,4-Naphthalenedicarbonitrile and Benzylic Donors. Medium Effects." J.Org. Chem.59. 829-835 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Jack Saltiel: "Photocycloaddition of 9,10-Dichloroanthracene to 2,5-Dimethyl-2,4-hexadiene. The Singlet Pathway for [4+2]-Adduct Formation in Benzene." J.Am. Chem. Soc.117. 9129-9138 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] William M.McGowan: "Competitive Bond Homolysis and Intersystem Crossing in the Picosecond Time Regime. Photodissociation of 9-Bromo-and 9-Chlorofluorene in Cyclohexane." J.Am. Chem. Soc.115. 9019-9025 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Lev R.Ryzhkov: "Low-Temperature Reactions in Single Crystals of Two Polymorphs of the Polycyclic Nitramine 15N-HNIW." J.Phys. Chem.100. 163-169 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Takanori Suzuki: "An absolute asymmetric synthesis of the [2+2] cycloadduct via single crystal-to-single crystal transformation by charge-transfer excitation of solid-state molecular complexes composed of arylolefins and bis[1,2,5]thiadiazolotetracyano-quinodimethane." J.Am.Chem.Soc.116. 2793-2803 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Hiroshi Ikeda: "Striking contrast between photoinduced and non-photoinduced electron-transfer reactions of 1,4-diphyenyl-2,3-diazabicyclo[2.2.2]oct-2-ene." J.Chem.Soc.,Chem.Commun.297-298 (1994)

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      1994 Annual Research Report
  • [Publications] Yasutake Takahashi: "Cycloreversion of arene endoperoxides induced by electron transfer." J.Chem.Soc.,Chem.Commun.13-14 (1994)

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      1994 Annual Research Report
  • [Publications] Yasutake Takahashi: "Triplet-state electron-transfer reactions of phyenylcyclopropane with quinones." J.Chme.Soc.,Chem.Commun.1127-1128 (1994)

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      1994 Annual Research Report
  • [Publications] Yasutake Takahashi: "Electron-transfer induced intramolecular [2+2] cycloaddition of 2,6-diarylhepta-1,6-dienes." Tetrahedron Lett.35. 3953-3956 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Yasutake Takahashi: "Electron transfer induced isomerization of cis,trans- and trans,trans-1,4-diphenyl-1,3-butadiene." Tetrahedron Lett.35. 5681-5684 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Takanori Suzuki: "2-(Thiopyran-4'-ylidene)-1,3-dithioles fused with thiophene units:intramolecular S・・・S interaction affecting the redox properties and molecular geometries." J.Chem.Soc.,Chem.Commun.13-14 (1994)

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      1994 Annual Research Report
  • [Publications] Akio Katsuki: "Spin-orbit coupling electron epin polirization observed in photosensitized electron transfer reactions between dyes and p-quinones." J.Am.Chem.Soc.116. 12065-12066 (1994)

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      1994 Annual Research Report
  • [Publications] Kimiko Akiyama: "Spin polarization conservation during intramolecular triplet-triplet energy transfer studied by time-resolved EPR spectroscopy." J.Am.Chem.Soc.116. 5324-5327 (1994)

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      1994 Annual Research Report
  • [Publications] Tania Elaine Wessel: "Stabilization of a putive cycclohexane-1,4-dil intermediate slicits an antrafacial Cope rearrangement via a stepwise mechansim.Phyrolysis of (R,E)-5-methyl-1,2,6-octatriene to 4-methyl-3-methylene-1,5-heheptadiene." J.Am.Chem.Soc.116. 495-565 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Matthew H.J.Cordes: "Stereochemistry of a cyclopropanone by crystal structure analysis.The exo-configuration of the Diels-Alder adducts of cyclopropenone and 1,3-diphenylisobenzofuran appears to be stabilized relative to the endo by an attractive ether-carbonyl interaction." J.Am.Chem.Soc.116. 11161-11162 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] P.J.Wagner: "The regioselectivity of internal hydrogene abstraction by triplet o-tert-amylbenzophenone." J.Am.Chem.Soc.116. 589-596 (1994)

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      1994 Annual Research Report
  • [Publications] Kung-Lung Cheng: "Biradical rearrangements during intramolecular cycloaddition of doble bonds to triplet benzenes." J.Am.Chem.Soc.116. 7945-7946 (1994)

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      1994 Annual Research Report
  • [Publications] P.J.Wagner: "Photoinduced radical cleavage of acylphenyl halides:Different mechansims for C-I and C-Br Bonds." J.Am.Chem.Soc.116. 10284-10285 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] P.J.Wagner: "Chiral auxiliaries promote both diasteroselective cycloadditions and kinetic resolutions of products in the ortho photocycloaddition of double bondes to benzene rings." J.Am.Chem.Soc.116. 10827-10828 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Xiaoming Zhang: "Dynamics of a-CH deprotonation and a-desilylation reactions of tertially aminecation radicals" J.Am.Chem.Soc.116. 4211-4220 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] Xiadong Lin: "A cephalotaxine synthesis founded on a mechanistically interesting,quasi-biomimetic strategy." J.Am.Chem.Soc.116. 9791-9792 (1994)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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