Synthesis and X-ray crystal structures of 2,3-dihydro-2-mercapto-2,1,3-benzophosphadiazine-4(1H)-thione 2-sulphide derivatives

Abstract

2-Amino-benzamide or -thiobenzamide, with phosphorus pentasulphide in pyridine, gave the pyridine complex (1) of 2,3-dihydro-2-mercapto-2,1,3-benzophosphadiazine-4(1H)-thione 2-sulphide (2), which with alkali and dimethyl sulphate yielded 1,2-dihydro-1-methyl-2,4-bismethylthio-2,1,3-benzophosphadiazine 2-sulphide (3). The ³¹P, ¹³C, and ¹H n.m.r. and mass spectra and some reactions of (1) and (3) were investigated, and their crystal structures were determined by direct methods.