Process for producing N-phosphonomethylglycine acid

Details Process for producing N-phosphonomethylglycine acid Process for producing N-phosphonomethylglycine acid

1984-05-11

1985-03-26

Evans, J. E.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

26050112, C07F 938

Patent

active

045072507

ABSTRACT:
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 ##STR1## wherein n is 1 or 2 and R.sub.5, R.sub.5', R.sub.6 and R.sub.6' are independently H, NH.sub.2, ##STR2## 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 R.sub.5, R.sub.5 ', R.sub.6 or R.sub.6 ' 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.

REFERENCES:
patent: 3907652 (1975-09-01), Wagenknecht et al.
patent: 3950402 (1976-04-01), Franz
patent: 3954848 (1976-05-01), Franz
patent: 3969398 (1976-07-01), Hershman
patent: 4147719 (1979-04-01), Franz

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