| 摘要 |
PCT No. PCT/GB94/00501 Sec. 371 Date Oct. 5, 1995 Sec. 102(e) Date Oct. 5, 1995 PCT Filed Mar. 15, 1994 PCT Pub. No. WO94/22881 PCT Pub. Date Oct. 13, 1994A process for the manufacture of an acid salt of an alkyl ester of N-phosphonomethylglycinonitrile is described which comprises reacting methyleneaminoacetonitrile trimer with a trialkylphosphite. The process is carried out under anhydrous conditions and in the presence of an anhydrous acid and an inert solvent in which methyleneaminoacetonitrile trimer is at least partially soluble and the acid salt of the alkyl ester of N-phosphonomethylglycinonitrile product is substantially insoluble. This is followed by recovering the precipitated acid salt of the alkyl ester of N-phosphonomethylglycinonitrile. |
