Cleavage of α-halo-substituted alkyl groups from silicon. The mechanism of catalysis by ammonia buffer
作者:J. Chojnowski、W. Stańczyk
DOI:10.1016/s0022-328x(00)86286-5
日期:1975.10
from silicon in n-propanol—water in the presence of ammonia buffer. The separate rate constants for the concurrent base-catalysed and base-plus-nucleophile-catalysed processes have been determined for the compounds XC6H4(Me2)SiCHCl2 with X = H, p-MeO, p-Me, p-Cl, m-Cl, m-CF3 and a good correlation with σ-constants found for both types of catalysis. Solvent isotope effects and steric effects of substituents
在氨缓冲液的存在下,已经进行了动力学研究,研究了碱催化从正丙醇-水中的硅上裂解α-二卤代烷基的过程。单独的速率常数并发碱催化和基址加的亲核试剂催化的方法已经确定了化合物XC 6 H ^ 4(ME 2)SiCHCl 2,其中X = H,p -MeO,p -Me,p - Cl,m -Cl,m -CF 3且与两种催化类型的σ常数均具有良好的相关性。还研究了取代基的溶剂同位素效应和空间效应。讨论了可能的机制。