申请人:Daiei Chemical Co., Ltd.
公开号:US05012015A1
公开(公告)日:1991-04-30
2,4-Dichloro-3-alkyl-6-nitrophenol, which is a precursor of 2,4-dichloro-3-alkyl-6-aminophenol useful for the production of a cyan coupler to be used with a sensitive material in the field of a photography in color, is industrially advantageously produced by (a) nitration of 2,4,5-trichloro-3-alkylbenzene, followed by hydrolysis of the resulting 2,4,5-trichloro-3-alkyl-6-nitrobenzene, or (b) hydrolysis of 2,4,5-trichloro-3-alkylbenzene-6-sulfonic acid or a salt thereof, followed by nitration of the resulting 2,4-dichloro-3-alkylphenol-6-sulfonic acid or a salt thereof, the starting material usable for these processes being 4-alkylbenzenesulfonic acid or a salt thereof, which is easily available.
2,4-二氯-3-烷基-6-硝基苯酚是2,4-二氯-3-烷基-6-氨基苯酚的前体,可用于生产一种青色偶合剂,用于彩色摄影中的敏感材料。该化合物可以通过以下两种工业优势方法制备:(a)硝化2,4,5-三氯-3-烷基苯,然后水解得到2,4,5-三氯-3-烷基-6-硝基苯,或(b)水解2,4,5-三氯-3-烷基苯-6-磺酸或其盐,然后硝化得到2,4-二氯-3-烷基苯酚-6-磺酸或其盐。这些过程的起始材料是4-烷基苯磺酸或其盐,易于获取。