Thiophosphoryl chloride changed triphenyl phosphite into triphenyl thiophosphate, tri-o- cresyl phosphite into tri-o-cresyl thiophosphate and diphenylmonochlorophosphite into diphenylmonochloro thiophosphate. The method of preparation consisted in mixing equimolecular amounts of organic phosphite and thiophosphoryl chloride, warming the mixture until reaction occurred, which was very violent at the start. It was completed by ...