Method for reducing 3-dimethylamnio-2-phenylpropion-acid ethyl ester-content in solutions of 2-dimethylamino-1-phenyl-3-cyclohexene-1-carboxylic acid ethyl ester
申请人:BASF Aktiengesellschaft
公开号:US07273947B1
公开(公告)日:2007-09-25
A process for reducing the content of ethyl 3-dimethylamino-2-phenylpropionate in a solution, contaminated therewith, of ethyl 2-dimethylamino-1-phenyl-3-cyclohexene-1-carboxylate in a water-immiscible solvent, which comprises adding from 0.5 to 2.0 equivalents of a carboxylic acid per mole of ethyl 2-dimethylamino-1-phenyl-3-cyclohexene-1-carboxylate to this solution, and stirring this mixture at a temperature of from 50° C. to 100° C., is described.
本发明涉及一种用于减少含有乙酰2-二甲氨基-1-苯基-3-环己烯-1-羧酸乙酯的溶液中乙酰3-二甲氨基-2-苯基丙酸乙酯含量的方法,该溶液被污染在不溶于水的溶剂中,包括向该溶液中加入每摩尔乙酰2-二甲氨基-1-苯基-3-环己烯-1-羧酸乙酯0.5至2.0当量的羧酸,并在50℃至100℃的温度下搅拌该混合物。