PROCESS FOR MANUFACTURING HERBICIDAL PHOSPHORUS COMPOUNDS,IN WHICH PHOSPHORUS ATOM IS LINKED WITH NITROGEN ATOM VIA CARBON ATOM

摘要

The invention relates to compounds containing phosphorus- carbon-nitrogen bond of the general formula I IMAGE wherein R1 and R2 are the same or different and stand for hydrogen or an organic radical, R3 and R4 are the same or different and stand for hydrogen, hydroxy or an organic radical. The compounds are prepared by reacting a phosphorus halide with ammonia, water soluble ammonium salts, primary or secondary amine in the presence of water and further with aldehyde or ketone. The product is recovered by reducing the reaction volume or by adding a water miscible organic solvent to the reaction mixture. The process is preferably suitable for the preparation of N-phosphono- methylglycine and derivatives thereof, which are significant in plant protection as herbicidally active compounds.