申请人:Himmler Thomas
公开号:US20050182274A1
公开(公告)日:2005-08-18
The present invention relates to a novel process for preparing 2,4,5-trimethylphenyl-acetic acid by reacting pseudocumene with dichloroacetyl chloride in a Friedel-Crafts reaction to give 2,2-dichloro-1-(2,4,5-trimethylphenyl)ethanone, converting the 2,2-dichloro-1-(2,4,5-trimethylphenyl)ethanone to 2,4,5-trimethylmandelic acid using an alkali metal hydroxide and reducing the 2,4,5-trimethylmandelic acid to 2,4,5-tri-methylphenylacetic acid.
本发明涉及一种新型的制备2,4,5-三甲基苯乙酸的方法,其通过将假双立克烷与二氯乙酰氯在弗里德尔-克拉夫茨反应中反应,得到2,2-二氯-1-(2,4,5-三甲基苯基)乙酮,将2,2-二氯-1-(2,4,5-三甲基苯基)乙酮转化为2,4,5-三甲基苯乙酸,使用碱金属氢氧化物,将2,2-二氯-1-(2,4,5-三甲基苯基)乙酮转化为2,4,5-三甲基苯甘酸,然后还原2,4,5-三甲基苯甘酸得到2,4,5-三甲基苯乙酸。