Base-catalysed cleavage of allylic derivatives of group IVA elements. I
作者:R.M.G. Roberts、Faiq El Kaissi
DOI:10.1016/s0022-328x(00)90900-8
日期:1968.4
The mechanism of alkalicleavage of 3-phenallyl derivatives of silicon, germanium and tin in aqueous alcoholic media has been studied spectrophotometrically Both solventisotope and primary salt effects are consistent with a rate determining SN2 attack on the metal or metalloid atom with the expulsion of a carbanion. The product of reaction is β-methyl styrene, indicating that proton attack on the
用分光光度法研究了硅,锗和锡的3-酚烯丙基衍生物在水介质中的碱性裂解机理,溶剂同位素和伯盐效应均与S N 2随驱逐作用对金属或准金属原子的腐蚀速率有关。碳负离子。反应产物是β-甲基苯乙烯,表明质子对碳负离子的攻击发生在3位。该反应似乎受到很大的空间作用。
Base-catalysed cleavage of allylic derivatives of group EVA elements II. Reactions of cinnamyl and benzyl derivatives in strongly basic media
作者:W.J. Rennie、R.M.G. Roberts
DOI:10.1016/s0022-328x(00)89263-3
日期:1972.4
The rates of cleavage of cinnamyl and benzyl derivatives of silicon, germanium and tin in strongly basic media have been measured spectrophotometrically. Correlations between these rates and acidity functions H−, J− and HR− were made and kinetic solvent isotope effects evaluated. For the cinnamyl derivatives, the yield of allylbenzene (S'E product) was much greater in aqueous alcohol than in aqueous