作者:Hervé Bibas、Rainer Koch、Curt Wentrup
DOI:10.1021/jo972137m
日期:1998.4.1
case of 4c the reaction was also monitored by online mass spectrometry. A lower temperature for the retro-ene reaction of 4c, eliminating an imine, than for 4a, eliminating formaldehyde, is in agreement with a lower calculated activation barrier (167 and 181 kJ mol(-1), respectively, at the G2(MP2,SVP) level of theory). The allenic amide 11 undergoes an analogous retro-ene reaction to the (unobserved)
在闪蒸真空热解(FVT)的条件下,烯丙酸酯和酰胺4经历逆烯反应,生成乙烯酮(6)和醛或亚胺(5)。通过环丁烯酮7的FVT通过环戊烷或氨基乙烯基乙烯酮3的开环和乙烯酮3至烯丙基1的1,3-重排而获得相同的产物。所有中间体和产物均通过基质分离红外光谱进行表征,在这种情况下对于4c,反应也通过在线质谱监测。消除亚胺的4c逆向烯反应的温度低于消除甲醛的4a的逆向反应温度,与在G2(MP2)上计算出的较低的活化势垒(分别为167和181 kJ mol(-1)一致,SVP)理论水平)。烯丙酰胺11与(未观察到的)乙烯基乙烯酮13经历类似的逆烯反应。