this invention pertains to novel processes for preparing phosphorus derivatives of aminothiomethylcarbamates using as intermediates corresponding phosphorus derivatives of aminothiocarbamic halides . the carbamates are useful as pesticides against insects , mites , and nematodes . two processes for preparing the corresponding intermediates are described . one preparation generally reacts an appropriate n - chlorothiophosphoramide with n - methylcarbamoyl halide . the other preparation generally reacts an n - chlorothiomethylcarbamoyl halide with an appropriate phosphoramide . the intermediate will react with various alcohols to produce the desired carbamates in the process of the invention .