The compounds O,O-diethyl- and O,O-diisopropyl-S-benzylthiophosphite, 2-benzyl-thio-4,5-benzo-1,3,2-dioxaphospholane, diphenyl-S-benzylthiophosphinite, and S,S-dibenzylphenyldithiophosphonite were obtained. It was found that the thiophosphites enter into isomerization initiated by oxygen in the air; substitution together with isomerization is thereby observed in the case of thioesters of P(III) with the P-C bond. The interaction of thioesters of P(III) with oxygen is inhibited by spin traps.
Preparation of benzylphosphonates via a palladium(0)-catalyzed cross-coupling of H-phosphonate diesters with benzyl halides. Synthetic and mechanistic studies
We have developed a new, efficient method for the synthesis of benzylphosphonate and benzylphosphonothioate diesters via a palladium(0)-catalyzedcross-couplingreaction between benzyl halides and H-phosphonate or H-phosphonothioate diesters, using Pd2(dba)3(CHCl3) as a palladium source and Xantphos as a supporting ligand. Some mechanistic aspects of these reactions were investigated using 31P NMR