... for Heterocycles.“ Reaction of Ketene—S,N-acetals with Aryl Isocyanatesz' HIROKI TAKAHATA, TOMOKO NAKAJIMA, MASAHARU NAKANO, AKIRA TOMIGUCHI, and TAKAO ... A. Tomiguchi, and T. Yamazaki, Heterocycles, 17, 413 (1982); c) H. Takahata, T. Nakajima, and T ...