A process for preparing 2-{1-[2-(4-chlorophenoxy)propoxyimino]-butyl}-3-hydroxy-5-(tetrahydrothiopyran-3-yl)cyclohex-2-enone lithium salt by reacting the corresponding acid 2-{1-[2-(4-chlorophenoxy)-propoxyimino]butyl}-3-hydroxy-5-(tetrahydrothiopyran-3-yl)-cyclohex-2-enone and lithium hydroxide and the isolation of the lithium salt are described. Here, it is advantageous to use a solvent mixture which comprises methanol and at least one aromatic hydrocarbon and to remove at least some of the solvent prior to the isolation. It is particularly preferred to dissolve the acid in an aromatic hydrocarbon, preferably toluene, and to use a methanolic lithium hydroxide solution.
The product, which can be obtained in a more efficient manner by this process, furthermore has considerable advantages with respect to formulation.
一种制备 2-{1-[2-(
4-氯苯氧基)丙氧基亚
氨基]-丁基}-3-羟基-5-(
四氢噻喃-3-基)环己-2-烯酮
锂盐的工艺,通过将相应的酸 2-{描述了 1-[2-(
4-氯苯氧基)-丙氧基亚
氨基]丁基}-3-羟基-5-(
四氢噻喃-3-基)-环己-2-烯酮和
氢氧化锂的反应以及
锂盐的分离。在此,最好使用一种由
甲醇和至少一种
芳香烃组成的混合溶剂,并在分离前除去至少部分溶剂。特别优选的是将酸溶解在
芳香烃中,最好是
甲苯,并使用
甲醇氢氧化锂溶液。
通过这种工艺可以更有效地获得产品,而且在配方方面也有相当大的优势。