Several α-hydroxyphosphonates have been prepared by the Pudovik reaction of the cyclic phosphite 5,5-dimethyl-1,3,2-dioxaphosphinan-2-one with aldehydes and β-oxo aldehydes. These can be readily converted to α-chloro- or α-bromophosphonates in excellent yield by simply treating them with thionyl chloride or bromide. Reaction with phosphorus triiodide gave α-iodophosphonates and α-hydridophosphonates. The Pudovik products are obtained from β-oxo aldehydes can be readily dehydrated to give vinylphosphonates.
通过环状
亚磷酸酯 5,
5-二甲基-1,3,2-二氧
磷杂环-2-酮与醛和δ-氧代醛的普多维克反应,制备了几种δ-羟基
膦酸盐。只需用亚
硫酰氯或
溴处理这些物质,就能很容易地将其转化为δ-
氯或δ-
溴膦酸盐,而且收率极高。与
三碘化磷反应可得到δ-
碘膦酸盐和δ-氢
膦酸盐。从 δ-oxo 醛中得到的 Pudovik 产物很容易脱
水,从而得到
乙烯基膦酸盐。