Patent ID: 9090536
Filing Date: 2015-07-28
Classification: C07C

Abstract:
1. A process for the preparation of a mixture of aspartic acid diethoxy succinate and an amino acid derivative of the general formula wherein n is 1-10, m is 0 or 1, and R is hydrogen or an alkali metal or alkaline earth metal ion, comprising reacting maleate with diethanol amine under alkaline conditions wherein the amount of the diethanol amine is substoichiometric in relationship to the amount of the maleate, in the presence of a lanthanoid catalyst to form aspartic acid diethoxy succinate followed by adding aspartic acid which reacts with unreacted maleate to form imino disuccinic acid, wherein the amino disuccinic acid is an amino acid derivative of formula I wherein m is 0, or by adding a diamine derivative of the general formula wherein n is as defined above, which reacts with unreacted maleate to form an amino acid derivative of formula I wherein m is 1 and n is as defined above.