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Studies on Synthetic Utilities, Properties, and Functionalities of Novel Acylsilanes

Research Project

Project/Area Number 13650922
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Synthetic chemistry
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

OHSHITA Joji  KYUSHU UNIVERSITY, Institute for Fundamental Research of Organic Chemistry, Associate Professor, 有機化学基礎研究センター, 助教授 (90201376)

Project Period (FY) 2001 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2002: ¥1,600,000 (Direct Cost: ¥1,600,000)
Fiscal Year 2001: ¥1,900,000 (Direct Cost: ¥1,900,000)
KeywordsAcylsilane / Silene / Cope rearrangement / Thermal isomerization / Enolate anion / 有機ケイ素化合物 / 有機リチウム / Cope転位
Research Abstract

To know the synthetic utilities of acylpolysilanes, three novel types of acylpolysilanes were prepared and their thermal isomerization was studied and found that they may be useful precursors for linear conjugated silenes, as summarized bellow. In addition, it was found that the reactions of silaenolates prepared from acylpolysilanes with benzophenone readily produced dioxasilacyclopentane derivatives in good yields. These results clearly indicate that the acylpolysilanes are useful for the preparation of novel silicon reactive species as well as that of cyclic organosilicon compounds.
1) It was found that the reactions of lithium silaenolates with phenyl-substituted acetylenes afforded acyl-(Z)-ethenyldisilane as the first example of α-functionalized acylpolysilanes. Acylethenyldisilanes thus obtained underwent unique isomerization at >100 degree C via 2-siladiene intermediates. This appears to be an important methodology to produce siladiene at rather low temperature.
2) Thermal isomerization of a bis(acyl)disilane involving a 2,3-disiladiene intermediate, leading to the formation of a 1,2-disilacyclobuene derivative was investigated
3) Thermal isomerization of compounds having two acyl groups linked by a cycloalkane bridge took place at >120 degree C to give the respective ring-enlarged products. This is the first observation of oxa-Cope rearrangement of silenes.

Report

(3 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • Research Products

    (12 results)

All Other

All Publications (12 results)

  • [Publications] Joji Ohshita: "Reactions of Lithium Silenolates with Benzophenone"Journal of Organometallic Chemistry. 633. 131-136 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshita: "Oxa-Cope Rearrangement of Silenes Thermally Generated from 1,2-Bis[tris(trimethylsilyl)silylcarbonyl]alkanes"Journal of the American Chemical Society. 123. 8400-9401 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshita: "Thermal Isomerization of 1,2-Diadamantoyltetrakis(trimethylsilyl)disilane via a 2,3-Disilabutadiene Intermediate"Journal of Organometallic Chemistry. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshita: "Thermal Isomerization of an Acyl(ethenyl)disilane via 2-Siladiene Intermediates"Journal of Organometallic Chemistry. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshita: "Reactions of Lithium Silenolates with Benzophenone"Journal of Organometallic Chemistry. 633. 131-136 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshima: "Oxa-Cope Rearrangement of Silenes Thermally Generated from 1,2-Bis[tris(trimethylsilyl)silylcarbonyl]alkanes"Journal of the American Chemical Society. 123. 8400-8401 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshima: "Thermal Isomerization of 1,2-Diadamantoyltetrakis(trimethylsilyl)disilane via a 2,3-Disilabutadiene Intermediate"Journal of Organometallic Chemistry. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshima: "Thermal Isomerization of an Acyl(ethenyl)disilane via 2-Siladiene Intermediates"Organometallics. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Joji Ohshita: "Thermal isomerization of 1,2-diadamantoyltetrakis(trimethylsilyl)disilane via a 2,3-disilabutadiene intermediate"J. Organomet. Chem.. (印刷中).

    • Related Report
      2002 Annual Research Report
  • [Publications] Joji Ohshita: "Oxa-Cope Rearrangement of Silenes Thermally Generated from 1,2-Bis [tris (trimethylsilyl) silylcarbonyl] alkanes"J. Am. Chem. Soc.. 123・34. 8400-8401 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Joji Ohshita: "Reactions of Lithium Silenolates with Acetylenes, Formation and Characterization of 2-Siladienes"Organometallics. 20・6. 1065-1070 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Joji Ohshita: "Reactions of Lithium Silenolates with Benzophenone"J. Organomet. Chem.. 633・1-2. 131-136 (2001)

    • Related Report
      2001 Annual Research Report

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Published: 2001-04-01   Modified: 2016-04-21  

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