作者:Robert A. Moss、Song Xue、Weiguo Liu、Karsten Krogh-Jespersen
DOI:10.1021/ja9626244
日期:1996.1.1
phenyl(benzoyloxy)carbene, photolytically generated from diazirine precursors in pentane at 25 °C, efficiently rearranged by 1,2-acyl migrations to give high yields of the appropriate 1,2-diketones. The kinetics of these rearrangements were determined by laser flash photolysis. Substituent effects on the acyl migrations and ab initio electronic structure calculations on ground state carbenes and transition
苯基乙酰氧基卡宾、苯基(新戊酰氧基)卡宾和苯基(苯甲酰氧基)卡宾,在 25 °C 下从戊烷中的二氮嗪前体光解生成,通过 1,2-酰基迁移有效地重排,以高产率获得合适的 1,2-二酮。这些重排的动力学由激光闪光光解确定。取代基对酰基迁移的影响和基态卡宾和过渡态的从头电子结构计算被用来分析重排机制。苯乙酰氧基卡宾向烯烃的加成以良好的产率进行,代替了 1,2-酰基转移;获得了两亲性卡宾的这些反应的绝对速率常数。(苯氧基甲基)乙酰氧基卡宾仅产生 1,2-H 位移;潜在的竞争性 1,2-乙酰基迁移受到抑制。