1993 Fiscal Year Final Research Report Summary
Formation of Unusual Valency by Heteroatom Interaction and Its Functional Capability
| Project/Area Number |
03640435
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
有機化学一般
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| Research Institution | University of Tsukuba |
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Principal Investigator |
FUJIHARA Hisashi University of Tsukuba, Chemistry Assist.Professor, 化学系, 講師 (30190101)
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| Project Period (FY) |
1991 – 1993
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| Keywords | Hypervalent bond / Heteroatom / Transannular interaction |
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| Research Abstract |
I have found that the transannular interaction between multi heteroatoms of cyclic chalcogenides can produce the dications and the hypervalent species. The results are summarized as follows.
The chemistry of hypervalent selenuranes is much less developed than that of sulfuranes, and sulfuranes with apical nitrogen ligands are little known. The three-center transannular interaction betwee selenium and two-nitrogen atoms of new N-benzyl derivatives of 1,11-(methanoaminomethano)-5H, 7H-dibenzo[b, g][1,5]selenazocine provides the stable aminoammonioselenurane which is a new type of an isolable cyclic diazaselenurane with two unsymmetrical apical nitrogen ligands of tertiary alkylamino and quaternary alkylammonio groups. Generally, selenuranes have two symmetrical electronegative groups such as oxygen or halogen atoms at the apical positions.
Much less is known about the chemistry of bis-hypervalent bouns with two adjacent hypervalent bonding species. Cyclic bis-telluride, 1,5-ditelluracyclo-octane reacted with halogens to give new dihalogenoditelluranes with a Te(IV)-Te(IV) bond. Reduction of the latter with aqueous NaOH, PhSH and SmI2 gave the neutral bis-telluride.
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[Publications] Hisashi Fujihara: "Preparation and X-Ray Structure of 8,9,19,20-Tetrahydrodinaphtho[1',8'-jk;1,8-bc][1,5,9,13]tetraselenacyclohexadecine,and its Novel Ring Contraction in Concentrated Sulfuric Acid" J.Chem.Soc.,Perkin Trans.1. 2145-2146 (1993)
Description
「研究成果報告書概要(和文)」より
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[Publications] Hisashi Fujihara: "Preparation and X-Ray Structure of 8,9,19,20-Tetrahydrodinaphtho[1', 8'-jk ; 1,8-bc][1,5,9,13]tetraselenacyclohexadecine, and its Novel Ring Contraction in Concentrated Sulfuric Acid" J.Chem.Soc., Perkin Trans.1. 2145-2146 (1993)
Description
「研究成果報告書概要(欧文)」より
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