首页> 外文期刊>Bulletin of the Chemical Society of Japan >Novel Stable Silicon-Based pi-Electron Systems:Synthesis,Unique Structure,and Properties of Cyclic,Spiroconjugated,and Cumulative Silicon-Silicon Doubly-Bonded Compounds
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Novel Stable Silicon-Based pi-Electron Systems:Synthesis,Unique Structure,and Properties of Cyclic,Spiroconjugated,and Cumulative Silicon-Silicon Doubly-Bonded Compounds

机译:新型稳定的硅基π电子体系:环状,螺共轭和累积硅-硅双键化合物的合成,独特的结构和性质

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摘要

In this account,the synthesis,structure,and reactions of cyclic,spiro-conjugated,and cumulative silicon-silicon doubly-bonded compounds are described.Photochemical and thermal interconversion among Si_4R_6 isomers including cyclotetrasilene 1,cyclotrisilene 2,and bicyclo[1.1.0]tetrasilane 7 occur without apparent participation of the corresponding tetrasila-l,3-diene,in contrast to the related interconversion among C_4H_6 isomers.Whereas parent spiropen-tadiene,the simplest spiroconjugation system,is known to survive only below -100 deg C,spiropentasiladiene 3 is thermally very stable and shows remarkable spiroconjugation between the two ring pi systems.The skeleton of isolable tri-silaallene 4,the first stable silicon compound with tetracoordinate divalent(formally sp-hybridized)silicon atom,is not linear but remarkably bent.The considerable conjugation between two cumulative Si=Si double bonds was observed.The structural feature of 4 is quite different from that of carbon-based allenes having linear structure without conjugation between two pi-bonds.
机译:为此,描述了环状,螺旋共轭和累积的硅-硅双键化合物的合成,结构和反应。Si_4R_6异构体包括环四硅1,环三硅2和双环[1.1.0]之间的光化学和热互变与C_4H_6异构体之间相关的相互转化相反,四硅烷7的出现没有相应的四硅-1,3-二烯的明显参与。而已知的最简单的螺共轭体系母体spiropen-tadiene仅能在-100℃以下存活, spiropentasiladiene 3具有很高的热稳定性,并且在两个环pi系统之间显示出显着的螺共轭共轭。可分离的三硅丙二烯4的骨架是第一个具有四配位二价(形式为sp杂化的)硅原子的稳定硅化合物,它不是线性的,但弯曲明显。观察到两个累积的Si = Si双键之间存在相当大的共轭.4的结构特征与碳基内六角烯的结构特征有很大不同具有线性结构的两个π键之间没有共轭。

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