consistent with either radical or polar mechanisms, and a concerted pathway with differential rates of bond formation is proposed. With dimethyl ketene a similar reaction gives a vinyl ester enolate, which presumably results from an initially-formed aldehyde enolate. Finally, the reaction of diphenyl ketene with tri-n-butyltin oxide results in a tin carboxylate which adopts a polymeric structure in the solid
芳基取代的烯酮与三正丁基氢化
锡的反应产生O-键合的烯醇
锡。对于不对称取代的甲基苯基烯酮,该方法几乎没有或没有立体选择性。动力学混合物由几乎相同比例的E和Z烯酸酯异构体组成,然后平衡为Z / E热力学控制下的混合物。机理研究与自由基或极性机理均不一致,并且提出了具有不同键形成速率的协同途径。对于
二甲基乙烯酮,类似的反应得到
乙烯基酯烯醇化物,这大概是由最初形成的醛烯醇化物引起的。最后,二苯基
乙烯酮与三正丁基氧化
锡的反应产生了
羧酸锡,其在固态下采用聚合物结构。