Patent ID: 6025490
Filing Date: 2000-02-15
Classification: C07D,C11D

Abstract:
A process for the preparation of a compound of the formula (I) in whichn represents 0, 1, or 2,M represents hydrogen, an alkali metal ion, or an unsubstituted or substituted ammonium ion, andX represents (i) anilino, (ii) N-alkylamino wherein the alkyl groups are optionally substituted and/or optionally interrupted by a heteroatom selected from the group consisting of O, N, and S, or (iii) N,N-dialkylamino wherein the alkyl groups independently are optionally substituted and/or optionally interrupted by a heteroatom selected from the group consisting of O, N, and S or the alkyl groups together with the nitrogen atom to which they are bonded form a saturated 5- or 6-membered heterocyclic ring,comprising reacting in an aqueous reaction medium having a temperature of at least 40.degree. C. and a pH of 5 to 10(1) a compound of the formula (IV) ##STR13## wherein M and n have the same meaning as above, with (2) an amine of the formula (V)X--H (V)wherein X has the same meaning as above, and(3) optionally, an acid-trapping agent other than an amine of formula (V),wherein the temperature of the aqueous reaction medium is at least 20.degree. C. higher than the temperature of the compound of formula (IV) being added and wherein the amine of formula (V) and the optional acid-trapping agent are independently added to the aqueous reaction medium before and/or during and/or after the addition of the compound of formula (IV).