The photoirradiation of thionophosphates, ROP(S)(OEt)2, derived from benzyl and vinylogously benzyl alcohols in CH3CN, with a Hanovia medium-pressure mercury lamp in a quartz vessel leads to the formation of the corresponding thiolophosphates, RSP(O)(OEt)2, through a non-chain radical pathway. This behavior of thionophosphates is unlike that of the related phosphates, which react through ionic dissociationârecombination processes. When the irradiation is conducted in solvents such as PriOH, THF and toluene, benzylation of these solvents takes place in synthetically respectable yields. Irradiation of thionophosphates in CH3CN leads to a convenient allylic benzylation of olefins.
从中式
苯甲醇和
苯乙烯式
苯甲醇衍生得到的
硫代磷酸酯ROP(S)(OEt)2,在CH3CN中使用Hanovia中压
汞灯在石英容器中进行光照射,通过非链自由基途径形成相应的
硫醇
磷酸酯R
SP(O)(OEt)2。
硫代磷酸酯的这种行为与相关的
磷酸酯不同,后者通过离子解离-
重组过程进行反应。当在PriOH、THF和
甲苯等溶剂中进行光照射时,这些溶剂会发生苯甲基化反应,产率可观。在CH3CN中对
硫代磷酸酯进行光照射,可方便地使烯烃进行烯丙基苯甲基化。