Reaction of bis(trimethylsiloxy)phosphine with methyl(phenyl)divinylsilane

Bis(trimethylsiloxy)phosphine is successfully used in various addition reactions to unsaturated synthons, leading to promising types of organophosphorus compounds [1]. We showed that the reaction of an excess of bis(trimethylsiloxy)phosphine with methyl(phenyl)divinylsilane provides a mixture of phosphonite I and bisphosphonite II in equal amounts. Phosphonites I and II were isolated in high yield. The reaction was initiated with 2,2 -azobisisobutyronitrile (AIBN) under conditions of its thermolysis (100 130 C).