1. To whom correspondence should be addressed
2. Sandler, S. R. and Karo, W. 1968.Organic Functional Group Preparations, Vol. I, 269–300. New York, N.Y.: Academic Press. C. A. Buehler and D. E. Pearson, “Survey of Organic Syntheses,” pp. 894–936, Wiley-Interscience, New York, N.Y., 1970
3. (Dimethylamido)phosphoryl Dichloride
4. Details of the mechanism remain to be determined
5. When a lesser quantity of DMPADC was used, varying amounts of carboxylic anhydrides were obtained. If desired, the excess reagent can be recovered by distillation prior to the work-up of the reaction mixture