Patent ID: 6818793
Filing Date: 2004-11-16
Classification: C07F

Abstract:
A process for the preparation of N-phosphonomethylglycine of the formula whereina) a hexahydrotriazine derivative of the formula II â€ƒin which X is CN, COOZ, CONR1R2 or CH2OY Y is H or a radical which is readily exchangeable for H, Z is H, an alkali metal, alkaline earth metal, C1-C18-alkyl or aryl, which is unsubstituted or substituted by C1-C4-alkyl, NO2 or OC1-C4-alkyl, R1 and R2 can be identical or different and are H or C1-C4-alkyl, is reacted with a triacyl phosphite of the formula III P(OCOR3)3â€ƒâ€ƒ(III) â€ƒin which radicals R3, which can be identical or different, are C1-C18-alkyl or aryl which is unsubstituted or substituted by C1-C4-alkyl, NO2 or OC1-C4-alkyl, and b) the product obtained is hydrolyzed, and if X is CH2OY, oxidized.