have been studied in methanol as a function of piperidine and methoxide ion concentrations. The reactions are catalysed by both piperidine and methoxide. Evidence is presented that the departure of the methoxy group is general-acid-catalysed, indicating a specific base-general acid mechanism for base catalysis.
已经研究了
甲醇中2-甲氧基-
3-硝基噻吩-5-
羧酸甲酯(1b)和5-乙酰基-2-甲氧基-
3-硝基噻吩(lc)的
哌啶子基取代动力学,它们是
哌啶和
甲醇盐的函数离子浓度。该反应由
哌啶和
甲醇盐催化。证据表明甲氧基的离去是一般酸催化的,表明碱催化的特定碱-一般酸机理。