Organometallic reagents attack the S S bonds of phosphorothionyl disulphides (V) to give high yields of the corresponding S-substituted phosphorodithioates. S-alkenyl and S-alkynyl phosphorodithioates, previously unknown, were prepared in this manner. No indication of attack at phosphorus atoms, of reduction of S S bonds, or of benzylic rearrangements of the organo-metallic reagents were observed.
