2-Aryloxy-2-halopropionic acid compounds are prepared by reacting 2-aryloxypropionic acid compounds with N-halocarboxylic acid imides in the presence of aliphatic halohydrocarbons as solvents, and of from 0.0001 to 0.001 mole of halogen per mole of N-halocarboxylic acid imide, from 0.005 to 0.05 per cent by weight of water, based on N-halocarboxylic acid imide, and from 0.0005 to 0.005 mole of azo-bis-isobutyronitrile and/or dibenzoyl peroxide, per mole of N-halocarboxylic acid imide. The end products obtainable by the process of the invention are valuable starting materials for the preparation of drugs, crop protection agents and dyes.
                            2-芳氧基-2-卤代
丙酸化合物是通过在脂肪族卤代烃溶剂存在下,将2-芳氧基
丙酸化合物与N-卤代
羧酸亚胺反应制备而成。在每摩尔N-卤代
羧酸亚胺中添加0.0001至0.001摩尔卤素,以及基于N-卤代
羧酸亚胺的0.005至0.05重量百分比的
水和0.0005至0.005摩尔的偶氮双(
异丁腈)和/或过苯甲酰过氧化物。该发明的终产物是制备药物、农药和
染料的有价值的起始材料。