Process for the optical resolution of mixtures of d-and 1-2-(6-methoxy-2-naphthyl)-propionic acids, which comprises preparing a solution of a mixture of d- and 1-2-(6-methoxy-2-naphthyl)-propionic acids and an optically active organic base in a predetermined organic solvent, slowly cooling the obtained solution and seeding with crystals of a salt of d-2-(6-methoxy-2-naphthyl)-propionic acid with the optically active organic base containing an amount by weight of the employed organic solvent, varying between about 9.5% and 14% and treating the obtained product with mineral acids in suitable organic solvents to obtain the free d-2-(6-methoxy-2-naphthyl)-propionic acid.
The cinchonidine salt of d-2-(6-methoxy-2-naphthyl)-propionic acid containing about 9.5% to about 14% by weight of an amide selected from formamide, monomethylformamide, dimethylformamide, monoehtylformamide, diethylformamide, monomethylacetamide and dimethylacetamide and the preparation thereof.
对 d-和 1-2-(6-甲氧基-2-
萘基)-
丙酸混合物进行光学解析的工艺,包括在预定的有机溶剂中制备 d-和 1-2-(6-甲氧基-2-
萘基)-
丙酸混合物以及光学活性有机碱的溶液、缓慢冷却所得到的溶液,并将 d-2-(6-甲氧基-2-
萘基)-
丙酸与光学活性有机碱的盐的结晶播种,其中光学活性有机碱的含量按所使用有机溶剂的重量计在约 9.5%到14%之间,然后在合适的有机溶剂中用矿物酸处理得到的产物,得到游离的d-2-(6-甲氧基-2-
萘基)-
丙酸。
d-2-(6-甲氧基-2-
萘基)-
丙酸的
辛可尼丁盐,含有选自甲酰胺、一甲基甲酰胺、二甲基甲酰胺、一甲基甲酰胺、
二乙基甲酰胺、一甲基乙酰胺和二甲基乙酰胺中的酰胺重量的约9.5%至约14%及其制备方法。