NEW GENERAL-SYNTHESIS OF MIXED PHOSPHORUS AND SULFONIC-ACIDS ANHYDRIDES VIA REACTION OF PHOSPHORUS-ACIDS BROMIDES AND IODIDES WITH SILVER SALTS OF SULFONIC-ACIDS - A ROUTE TO P-CHIRAL ANHYDRIDES

Reaction of phosphorus acids bromides and iodides with silver salts of sulfonic acids leads to the formation of mixed phosphorus and sulfoni c acids anhydrides 3 in excellent yield. This method allowed the first synthesis of mixed anhydrides containing a P-chiral centre; they were subsequently separated into pure diastereoisomers.