The present invention relates to alanine N-acetic acid precursors of formula (i) COOM-CH(CH3)-NH-(CH2CN), wherein M is hydrogen (alanine N-monoacetonitrile), or (ii) COOM-CH(CH3)-N-(CH2CN)2, wherein 0 to 50% of all M is sodium or potassium and 50 to 100% of all M is hydrogen (alanine Ν,Ν-diacetonitrile and its partial sodium or potassium salts) comprising L-alanine to D-alanine in a range of from 75:25 to 50:50 (L:D), or (iii) COOM-CH(CH3)-N-(CH2CONH2)2, wherein M is hydrogen (alanine Ν,Ν-diacetamide), in the form of crystals, and relates to a process to prepare these precursors and their use, especially to give MGMA or MGDA.
本发明涉及公式(i)COOM-CH(
CH3)-NH-(CH2CN)的丙
氨酸N-乙酰基前体,其中M为氢(丙
氨酸N-单
乙腈基),或(ii)COOM-CH( )-N-(CH2CN)2的丙
氨酸N-乙酰基前体,其中所有M的0至50%为
钠或
钾,所有M的50至100%为氢(丙
氨酸Ν,Ν-二
乙腈基及其部分
钠或
钾盐),包括
L-丙氨酸到
D-丙氨酸的比例范围为75:25至50:50(L:D),或(iii)COOM-CH( )-N-(CH2CONH2)2的丙
氨酸N,Ν-二乙酰胺前体,其中M为氢(丙
氨酸Ν,Ν-二乙酰胺),以晶体形式存在,并涉及一种制备这些前体及其用途的方法,特别是用于制备M
GMA或MG
DA。