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:EP2289867A3
公开(公告)日:2012-04-25
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.
本发明涉及一种用于大规模生产纯4-(4-卤代-1-氧丁基)-α,α-二甲基苯乙酸或其烷基酯的过程,其中该过程包括将(2-卤代-1,1-二甲基乙基)苯与醋酸盐缩合,然后用ω-卤代化合物酰化,水解和环化得到产物的区域异构体,随后氧化和纯化以获得纯的区域异构体,进一步卤代和/或酯化对位区域异构体,以生产4-(4-卤代-1-氧丁基)-α,α-二甲基苯乙酸或其烷基酯。