The direct esterification of phosphinicacids has been extended to the preparation of thiophosphinates using thiols, but the conversions are only ca. 50%. The outcome is in agreement with the unexpectedly high enthalpy of activation and endothermicity suggested by quantum chemical calculations. At the same time, formation of the thiophosphinates confirms the AAC2 (phosphinylation) mechanism and excludes
次膦酸的直接酯化作用已扩展到使用硫醇制备硫代次膦酸酯的过程,但转化率仅为约2。50%。结果与量子化学计算所暗示的活化焓和吸热性出乎意料的高一致。同时,硫代次膦酸酯的形成证实了A AC 2(次膦酸酯化)的机理,并且排除了S N反应路径。在实验条件下也排除了在反应条件下形成烯烃中间体的可能性。