A process for producing 4-(4-halo-1-oxybutyl)-alpha,alpha-dimethylbenzene acetic acid or alkyl esters thereof
申请人:Jubilant Organosys Limited
公开号:EP2289867A2
公开(公告)日:2011-03-02
Disclosed herein is a process for large scale production of pure 4-(4-halo-1-oxybutyl)-α,α-dimethylbenzene acetic acid or alkyl esters thereof, wherein the process comprises of condensing (2-halo-1,1-dimethyl-ethyl)benzene with acetate salt followed by acylation with ω-halo compound, hydrolyzing and cyclizing the resultant regioisomers, subsequently oxidizing and purifying to obtain pure regioisomer, further halogenating and/or esterifying the para regioisomer to produce 4-(4-halo-1-oxybutyl)-α,α-dimethylbenzene acetic acid or their alkyl esters.
本文公开了一种大规模生产纯 4-(4-卤代-1-氧丁基)-α,α-二甲基苯乙酸或其烷基酯的工艺,其中该工艺包括将(2-卤代-1,1-二甲基乙基)苯与乙酸盐缩合,然后与ω-卤代化合物酰化、水解和环化得到的对位异构体,然后氧化和纯化得到纯的对位异构体,进一步卤化和/或酯化对位异构体,得到 4-(4-卤代-1-氧丁基)-α,α-二甲基苯乙酸或其烷基酯。