psyloxy (Hive Addict) 11-13-03 16:53 No 470665				acetic / propionic anhydride from NaO(Me)Ac + TsCl (Rated as: excellent)
						Patent DE123052 Ac2O 382 parts by weiht of TsCl are well mixed with 328 parts of dry NaOAc and heated / cooled by a reflux condenser. Temperature quickly rises to 140°C. After a couple of hours the produced Ac2O is distilled from the salt mass . MeAc2O Equal parts TsCl and sodium propionate are well mixed and held refluxing at ~150°C for multiple hours. The propionic anhydride is  removed by vac. distillation. There's also methods for the preparation of AcCl, salicylic acid chloride and benzoic acid anhydride in the patent. --psyloxy-- "I'd rather be a small part of something great, than a big part of a pile of shit" - Josh Homme