0-Aryl phosphorodichloridothioates on reaction with ammonia and aliphatic amines gave 0- aryl phosphoramidochloridothioates and 0-aryl phosphorodiamidothioates in high yields. 0- Aryl phosphorodichloridothioates also react with substituted hydrazines to give 0-aryl phosphorohydrazidochloridothioates and 0-aryl phosphorodihydrazidothioates in high yields. The reactions were found to be dependent on temperature of reaction, mole ratio, ...