α-Lithio-α-phosphoryl dithioacetals 2 react with aldehydes and ketones to give conjugated ketene dithioacetals in moderate to good yields. Monitoring the reaction course by 31P NMR spectra revealed that the reaction with aldehydes involves a 1,2-addition followed by decomposition to the Horner-Wittig reaction products. Ketones react in a different way forming at first the 1,4-adducts that undergo isomerization
α-
硫代-α-
磷酰基二
硫缩醛2与醛和酮反应,以中等至良好的产率得到共轭的烯酮二
硫缩醛。通过31 P NMR光谱监测反应过程,发现与醛的反应涉及1,2-加成反应,然后分解为Horner-Wittig反应产物。酮以不同的方式反应,首先形成1,4-加成物,这些加成物异构化为1,2-加成物,后者分解为共轭烯酮二
硫缩醛。α-
硫代α-
磷酰基甲基甲
硫醚6与酮(
查尔酮)的反应已由31表示通过1 H NMR谱图可知,1,2-加成产物为中间体,不会分解为Horner-Wittig反应产物,但会重排为相应的1,4-加合物。