申请人:SUMITOMO CHEMICAL COMPANY, LIMITED
公开号:EP0405928A1
公开(公告)日:1991-01-02
Pure 1,4-dihydroxy-2-arylnaphthoate is prepared in high yield by allowing 1,4-dihydroxy-2-naphthoic acid to react with triarylphosphite in the presence of an acid catalyst selected from organic and inorganic acids and crystallizing from a mixed solvent consisting essentially of lower alcohols and water until 1,4-dihydroxy-2-naphthoic acid is isolated and is further purified by crystallization from a mixed solvent consisting essencially of lower alcohols, water and extraction solvent, i.e., alkyl-substituted aromatic hydrocarbons or halogen-substituted aliphatic or aromatic hydrocarbons.
通过让 1,4-二羟基-2-萘甲酸与三芳基亚磷酸酯在选自有机酸和无机酸的酸催化剂存在下发生反应,并从主要由低级醇和水组成的混合溶剂中结晶,以高产率制备纯的 1,4-二羟基-2-芳基萘甲酸酯,直到分离出 1,4-二羟基-2-萘甲酸、4-二羟基-2-萘甲酸分离出来,并通过从主要由低级醇、水和萃取溶剂组成的混合溶剂中结晶进一步提纯。e.,烷基取代的芳香烃或卤素取代的脂肪族或芳香烃。