The novel highly efficient synthesis of sym-tetra-alkyl monothiopyrophosphates (RO)2P(O)SP(O) (OR′)2 based on the condensation of dialkoxyoxophosphoranesulphenyl chlorides with dialkyltrimethylsilyl phosphites is described.
remarkably selective reaction of O,O,O-dialkyltrimethylsilylselenophosphates (1) in the presence of equimolar amounts of dialkyltrimethylsilyl phosphites (2) with sulphuryl chloride leading to tetra-alkylsymmetrical selenopyrophosphates (3) in excellent yields is reported.