SYNTHESIS AND STRUCTURE OF NOVEL PHOSPHOROHYDRAZIDES AND HEXAHYDRO-1,3,4,2-THIADIAZAPHOSPHORIN-2,5-DIONE(OR 2-THION-5-ONES

Abstract O-Aryl,S-(ethoxycarbony1)methyl.N1-methyl (di)thiophosphorohydrazides (21) were prepared in high yield from sodium ethyl 2mercaptoacetate and O-ary1.N1-methyl (thio)phosphorochlorohydrazides derived from O-aryl (thio)phosphorodichloridates and methyl hydrazine. The thermal reaction of (21) resulted in the formation of hexahydro-l,3,4,2-thiadiazaphosphorin-2,5-dione(or 2-thion-5-ones) (22). The X-ray diffraction analysis of (22a) indicated the ring containing P atom has a boat conformation.