Patent ID: 6590120
Filing Date: 2003-07-08
Classification: C01B,C07C,C11D,D21C,G03C

Abstract:
A method for the preparation of an N-bis-(2-(1,2-dicarboxy-ethoxy)-ethyl)-amine derivative having the formula (I) characterized in that an alkali or earth alkali metal salt of maleic acid is brought to a reaction with an N-substituted diethanolamine with a substituent group R1, to react with the two ethanol groups of said diethanolamine while the substituent group R1 bound to the N atom is unreactive with said maleic acid salt and thus preserved in the derivative obtained as the final product, wherein R1 is an alkyl chain with a single carboxylic acid group, and R2 and R3 are hydrogen or alkali or earth alkali metal ions.