| abstract |
The invention relates to a process for the preparation ofnN-phosphonomethyl-amino acids and their esters of formula I bynReaction of Hexahvdro-s-triazines of the formula II withnPhosphoric diesters in the molar ratio of at least 1: 3, whereinnby subsequent acid hydrolysis the freenN-phosphonomethyl-amino acids or by distillation ornNeutralization and extraction of the N-phosphonomethyl-amino acid estersnto be obtained. In formulas I and II, R, r \ R ^;nHydrogen or alkyl from C-j to C ^; R ', R3: SUbst.nAlkyl, aryl, subst. aryl; R3: alkyl from C-j to C4 or anAlkali metal; A: branched and unbranched, subst. and unsubst.nAlkylene of C2 to C-jq, cycloalkylene or anheterocyclic radical. - Formulas I and II - |