作者:Toshihiko Migita、Kiyoshi Kurino、Wataru Ando
DOI:10.1039/p29770001094
日期:——
Relative rate constant for the addition of several carbenes to a series of allylic compounds have been determined by means of competititive experiments. These results and derived Hammett–Taft parameters show that polar selectivities of carbenes are generally low, but correlate with the polar natures of the carbene substituents. The selectivity of a singlet carbene was even lower than that of the corresponding
已经通过竞争性实验确定了将几种卡宾加入一系列烯丙基化合物中的相对速率常数。这些结果和推导的Hammett-Taft参数表明,碳烯的极性选择性通常较低,但与卡宾取代基的极性相关。单线态卡宾的选择性甚至低于相应的三线态。这些事实支持了加成单线碳烯的机理,该单线碳烯涉及由极性结构贡献很小的过渡态。烷氧羰基卡宾的低选择性表明,烷氧羰基的– R效应不会影响卡宾的加成反应性。