作者:J. Peter Guthrie、Junan Guo
DOI:10.1021/ja954247l
日期:1996.1.1
cyclization of 2,5-hexanedione is 2400 times slower than that of 2,6-heptanedione. As expected on the basis of intermolecular analogs, the addition step is less favorable and slower for 1-phenyl-1,5-hexanedione, and the addition step for 5-oxohexanal is more favorable though similar in rate to that for heptanedione. Detailed analysis of the kinetics and equilibrium for all of these compounds, as well
已经确定了 2,5-己二酮、2,6-庚二酮、1-苯基-1,5-己二酮和 5-氧代己醛的分子内缩合反应中的醛醇加成和消除步骤的速率和平衡常数。2,5-己二酮和2,6-庚二酮环化的整体热力学相似;2,5-己二酮转化为相应的烯酮实际上更有利,但2,5-己二酮的环化比2,6-庚二酮慢2400倍。正如基于分子间类似物所预期的那样,1-苯基-1,5-己二酮的加成步骤不太有利且较慢,5-氧代己醛的加成步骤更有利,但速率与庚二酮相似。详细分析所有这些化合物以及 2-(2-氧代丙基)苯甲醛的动力学和平衡,就马库斯理论而言,分子内反应导致与之前分子间反应相同的内在障碍。这我...