The Wittig reaction of nonstabilized ylides with benzaldehyde and benzophenone was investigated in detail by means of carbonyl- 14 C kinetic isotope effects, substituenteffects, and isotope-scrambling and probe experiments. The reaction with benzophenone gave the carbon isotope effects and the Hammett p values of considerable magnitude both in Li salt-free and salt-present conditions. In contrast
通过羰基- 14 C 动力学同位素效应、取代基效应以及同位素加扰和探针实验,详细研究了不稳定叶立德与苯甲醛和二苯甲酮的 Wittig 反应。与二苯甲酮的反应在无锂和含盐条件下都产生了相当大的碳同位素效应和哈米特 p 值。相比之下,它们与苯甲醛的反应非常小。烯酮异构化和脱卤探针实验表明不稳定的叶立德有足够的能力将电子转移给苯甲醛和二苯甲酮
Electron transfer in the reaction of benzaldehyde with a nonstabilized ylide