Electron spin resonance studies of aryl-substituted cyclopolysilane anion-radicals
作者:A.C. Buchanan、Robert West
DOI:10.1016/s0022-328x(00)92358-1
日期:1979.6
associated with the biphenyl ring system. An analysis of 1H and 13Chyperfine coupling constants for Si5Me9X−. suggests that the principal effect of the aryl substituents is inductive. The anion-radicals of Si5Me9SiMe2X decay to Si5Me9H−., and the electronic nature of the aryl substituent has no major effect on the stability of the parent radical.
几种芳基取代的环聚硅烷已还原为阴离子基团,并已通过ESR光谱进行了研究。研究的化合物为Si 5 Me 9 X(X phenyl苯基,联苯,p -Me 3 SiC 6 H 4,p -MeC 6 H 4)和p -MeC 6 H 4)和Si 5 Me 9 SiMe 2 X(X苯基,p -Me 3 SiC 6 H 4和p- Me 2 NC 6 H4)。除联苯基九甲基环戊硅烷外,该物种具有典型的离域环戊硅烷阴离子自由基的ESR光谱,这给出了ESR图谱,表明未配对的电子主要与联苯环系统相关。Si 5 Me 9 X-的1 H和13 C超精细偶合常数的分析。这表明芳基取代基的主要作用是诱导性的。Si 5 Me 9 SiMe 2 X的阴离子基团衰减为Si 5 Me 9 H- 。,并且芳基取代基的电子性质对母体基团的稳定性没有重大影响。
Ring contraction of cyclohexasilanes to silylcyclopentasilanes and the preparation of monofunctional nonamethylcyclopentasilanes
作者:M. Ishikawa、M. Kumada
DOI:10.1039/c2969000567b
日期:——
Dodecamethylcyclohexasilane undergoes ringcontraction with aluminium chloride as catalyst in the presence or absence of trimethylchlorosilane to give, respectively, chlorodimethylsilyl- or trimethylsilyl-cyclo-pentasilane, the former being convertible into monofunctionalnonamethylcyclopentasilanes.
By use of salt elimination, the transition-metal-substituted cyclopentasilanes Me9Si5-Co(CO)3PPh3. Me9Si5-Fe(CO)2Cp, Me9Si5-SiMe2Co(CO)3PPh3 and Me9Si5-SiMe2Fe(CO)2Cp were prepared and characterized.
HELMER, B. J.;WEST, R., J. ORGANOMET. CHEM., 1982, 236, N 1, 21-32
作者:HELMER, B. J.、WEST, R.
DOI:——
日期:——
Ein neuer Weg zu Cyclopentasilanderivaten
作者:E. Hengge、P. K. Jenkner、A. Spielberger、P. Gspaltl
DOI:10.1007/bf00814146
日期:1993.10
By means of the new possibility to split a trimethylsilyl group from the methylated cyclopentasilane by action of EtONa, a new, simple, and effective pathway to valuable molecules for other syntheses was found.