Internal nucleophilic displacements within silanolate ions. A new mechanism of substitution at silicon
作者:Zakaria H. Aiube、Julian Chojnowski、Colin Eaborn、Wlodzimierz A. Stańczyk
DOI:10.1039/c39830000493
日期:——
Unimolecular dissociation of –O–(X)Si< species to give X– and OSi(which immediately reacts with the solvent) is postulated to account for (a) features of the base-catalysed cleavage of R–Si bonds in solutions of RSiMe2OMe (R =m-ClC6H4CH2 or PhCC) in 5% H2O–MeOH and (b) the rapid conversion of (Me3Si)3CSiPh(OH)I into (Me3Si)3CSiPh(OH)(OMe) by methanolic MeONa.
假定– O–(X)Si <物种单分子解离生成X –和O Si (立即与溶剂反应),以解释(a)碱溶液中R–Si键的碱催化裂解的特征。在5%H 2 O–MeOH中的RSiMe 2 OMe(R = m -ClC 6 H 4 CH 2或PhC C)和(b)将(Me 3 Si)3 CSiPh(OH)I快速转化为(Me 3 Si甲醇MeONa )3 CSiPh(OH)(OMe)。