ments made as well as indicating the functional similarity of the two ring systems. Reaction of I in cold glacial acetic acid with aqueous sodium nitrite resulted in the precipitation of a golden yellow solid, 2-nitrosoiminothiazolidine (11). This compound gave a positive Liebermann's nitrosoamine test and was decomposed by concentrated HC1 to nitrous acid and the hydrochloride of I. Treatment of I1 with ethanolic KOH resulted in the formation of ...
