Elimination and addition reactions. Part 33. Formation and behaviour of carbanions derived from sulphones and nitriles bearing β-′onium substituents
作者:Kenneth N. Barlow、Donald R. Marshall、Charles J. M. Stirling
DOI:10.1039/p29770001920
日期:——
Kinetics of elimination reactions of β-arylsulphonylethyl- and β-cyanoethyl-ammonium and -sulphonium salts have been measured in ethanolic triethylamine buffers. The reactions show buffer saturation kinetics; at low buffer base concentrations ionisation to form the intermediate carbanion is rate-determining, but at higher buffer base concentrations the intermediate carbanion is formed in a rapidly
已经在乙醇三乙胺缓冲液中测量了β-芳基磺酰基乙基-和β-氰基乙基铵和-磺酸盐的消除反应的动力学。反应显示出缓冲液饱和动力学。在低缓冲碱浓度下,电离形成中间碳负离子是决定速率的,但是在较高缓冲碱浓度下,中间碳负离子是在快速建立的预平衡步骤中形成的,在恒定缓冲液下,观察到的速率常数不会随碱浓度的增加而变化。比率。