Gas-phase activation data were obtained for model sulfoxide elimination reactions. The activation enthalpy for methyl 3-phenylpropyl sulfoxide is 32.9 +/- 0.9 kcal/mol. Elimination by methyl vinyl sulfoxide to form acetylene has an enthalpic barrier of 41.6 +/- 0.8 kcal/mol and that of 3-phenylpropyl methanesulfinate to form hydrocinnamaldehyde is 34.6 +/- 0.6 kcal/mol. Calculations at the MP2/6-311+G(3df
获得了用于模型
亚砜消除反应的气相活化数据。3-
甲基苯基
丙亚砜的活化焓为32.9 +/- 0.9 kcal / mol。用
甲基乙烯基亚砜消除形成
乙炔的焓屏障为41.6 +/- 0.8kcal / mol,而3-亚
苯基丙基甲亚
磺酸盐形成
氢肉桂醛的焓屏障为34.6 +/- 0.6kcal / mol。对于这些反应的简化模型,在MP2 / 6-311 + G(3df,2p)// MP2 / 6-31G(d,p)级别进行的计算分别提供了32.3、40.3和32.7 kcal / mol的势垒。通过计算检查了一系列其他化合物,结果表明,除通常确定的DeltaH ++外,如果有可用的DeltaH数据,则对
亚砜消除反应的取代基影响要简单得多。