| 摘要 |
The invention provides a process for producing N-phosphonomethylglycine acid (NPMG) comprising (a) oxidizing an N-(phosphonomethyl) iminodiacetic acid (NPMIDA) derivative of the general formula I <IMAGE> (I) wherein n is 1 or 2 and R5, R5', R6 and R6'are independently H, NH2, <IMAGE> or an aryl, cycloalkyl or straight or branched chain alkyl or alkenyl group optionally substituted by hydroxy or halogen, or an alkylaryl group, provided that at least one of R5, R5', R6 or R6' is hydrogen, to produce a corresponding iminourea salt of NPMG and then (b) reacting the salt with an acid stronger than NPMG whereby NPMG is produced and there remains in solution the iminourea salt of the stronger acid. |
