Abstract
Lawesson's reagent reacts with dialkyl disulfides to form S,S-alkyl-S'-alkyl (4-methoxyphenyl) phos phonotrithiolothionoates with P-S-S-Alk bonds. The reactions of 2,4-bis(4-alkoxyphenyl)-2,4-dithioxo-1,3,2λ5,4λ5-dithiadiphosphetanes with thioacetals and acetals were reinvestigated and were shown to give trithio- and dithiophosphonates including an aldehyde fragment in their composition.