The monoepoxidation of acyclic, conjugated aliphatic dienes by dimethyldioxirane: kinetics
作者:Alfons L. Baumstark、Pedro C. Vasquez、Elba Michelena-Baez、Hsin-Hung Chen
DOI:10.1515/hc-2011-0125
日期:2012.4.1
marked contrast to those of simple aliphatic alkenes. The relative reactivities were modeled using a density function approach. Consistent with previous calculations on alkene systems, a concerted process with a spiro transition state was obtained for diene epoxidation regardless of the initial orientation of the reactants. The relative reactivities for monoepoxidation of 2c–e were calculated based on the
摘要 报道了二甲基二环氧乙烷 (1) 与一系列无环脂肪族共轭二烯 2a-f 反应的动力学数据。单环氧化是优选的方法,只要二烯过量,单环氧化物就会以高产率形成。结果表明,与简单烯烃相比,二烯的环氧化对结构效应的敏感性较低。此外,与简单的脂肪族烯烃相比,这些单环氧化对顺式/反式取代几乎没有敏感性。使用密度函数方法对相对反应性进行建模。与之前对烯烃系统的计算一致,无论反应物的初始取向如何,二烯环氧化都获得了具有螺过渡态的协同过程。