A process of the preparation of the salts of N,N'-disubstituted ethylenediamine-N,N'-diacetic acid derivatives of the formula (IA), by alkylation of N-substituted glycine derivative of the formula (II) with 1,2-dichloroethane; and a process the preparation of acid addition salts of the formula (IB), by acidification of the salt of the formula (IB) with a suitable acid; and the use of the salts of the formula (IA) and (IB) thus obtained in the preparation of iron(III) or zinc(II) chelates. In the formulae, R represents hydrogen atom or CH3 group, M represents sodium or potassium cation and X represents HCl or H2SO4.
一种通过用
1,2-二氯乙烷对式(II)的 N-取代甘
氨酸衍
生物进行烷基化而制备式(IA)的 N,N'-二取代
乙二胺-N,N'-二
乙酸衍
生物盐的工艺;以及制备式(IB)的酸加成盐的工艺,方法是用适当的酸将式(IB)的
盐酸化;并将由此获得的式(IA)和(IB)的盐用于制备
铁(III)或
锌(II)螯合物。式中,R 代表氢原子或
CH3 基团,M 代表
钠或
钾阳离子,X 代表 HCl 或 H2SO4。