[EN] IMPROVED PROCESS FOR THE PREPARATION OF HALO-DIALKOXYBENZENES<br/>[FR] PROCÉDÉ AMÉLIORÉ POUR LA PRÉPARATION D'HALOGÉNO-DIALCOXYBENZÈNES
申请人:HIKAL LTD
公开号:WO2011064789A1
公开(公告)日:2011-06-03
The invention describes an improved method for producing halo-dialkoxybenzenes of formula (I) such as 1-fluoro-2, 3-dialkoxybenzene as well as 2-fluoro-1, 4-dialkoxybenzene, Formula (I) by reacting commercial 2-fluorophenol is reacted with an allyl halide in N-methylpyrrolidone (NMP) followed by rearranging the resultant 2-fluoroallylphenylether to form 2-allyl-6-fluorophenol and its para isomeric counterpart. This compound mixture is then directly alkylated to form isomeric substituted allyl alkoxybenzenes and subjected to isomerization to form the corresponding propenyl derivatives. All the above four steps are carried out without any workup except one filtration. 6-Fluoro-2-propenyl alkyl phenyl ether is separated from the other isomer by a fractional distillation in good yields. The isomers are oxidized to the corresponding benzaldehydes using oxidants in presence of a halo hydrocarbon solvent. The benzaldehydes is further oxidised with an organic or an inorganic peroxide in a halo hydrocarbon solvent to obtain the corresponding phenols, which is thereby alkylated to form compound of formula (I).
该发明描述了一种改进的生产卤代二烷氧基苯的方法,其中化学式为(I),例如1-氟-2,3-二烷氧基苯和2-氟-1,4-二烷氧基苯。通过将商业2-氟苯酚与烯丙基卤化物在N-甲基吡咯烷酮(NMP)中反应,然后重排得到的2-氟烯丙基苯醚形成2-烯丙基-6-氟苯酚及其对位异构体。然后,将这种化合物混合物直接烷基化以形成异构的烯丙基烷氧基苯,并进行异构化以形成相应的丙烯基衍生物。所有以上四个步骤都在除一个过滤之外不进行任何处理。6-氟-2-丙烯基烷基苯醚通过分馏以高收率与其他异构体分离。这些异构体在存在卤代烃溶剂中使用氧化剂氧化为相应的苯甲醛。苯甲醛进一步在卤代烃溶剂中与有机或无机过氧化物氧化以获得相应的酚,然后烷基化以形成化合物的化学式(I)。