A New Stereoselective Route to the Unsymmetrical Tetraalkyldithiopyrophosphates

Abstract
The unsymmetrical dithiopyrophosphates 9 are formed in reaction of dialkoxythioxaphosphoranesulfenyl chlorides 1 with dialkyltrimethylsilylphosphites. The stereospecificity of this reaction is demonstrated on model derivatives of diastereoisomeric-4-methyl-1,3,2-dioxaphosphorinans ring system. The novel synthesis of 4a and 4b and their structural assignment is also described.