Rongalite-promoted transition metal-free synthesis of S-aryl phosphorothioates

The improved procedure for the synthesis of S-aryl phosphorothioates from dialkyl phosphites (H-phosphonates), aryl iodides and elemental sulfur deals with the application of rongalite (sodium hydroxy-methanesulfinate) as the radical promoter. The reactions proceeded smoothly to give S-aryl phosphorothioates in good yields.