Alkylation of cyclic ß-oxophosphonates using the ion pair extractive-phase transfer catalysis method was studied using 2-(diethoxyphosphinyl) cyclohexanone as the model compound. Unlike related phosphonic acid derivatives, the cyclic ß-oxophosphonates exhibited ambident character under phase transfer conditions when dichloromethane was used as the solvent. Carbon alkylation was most effective when activated and sterically less demanding alkyl halides were utilized.
以 2-(二乙氧基膦酰基)
环己酮为模型化合物,利用离子对萃取-相转移催化法研究了环ß-氧
膦酸盐的烷基化反应。与相关的
膦酸衍
生物不同,当使用
二氯甲烷作为溶剂时,环状ß-氧
膦酸盐在相转移条件下表现出惰性。 当使用活化且立体要求较低的烷基卤化物时,碳烷基化最为有效。