3-Cyano-2,4,5-trifluorobenoxyl fluoride and intermediate products for the production thereof
    117.
    发明授权
    3-Cyano-2,4,5-trifluorobenoxyl fluoride and intermediate products for the production thereof 有权
    3-氰基-2,4,5-三氟丁氧基氟及其制备的中间产物

    公开(公告)号:US07268248B2

    公开(公告)日:2007-09-11

    申请号:US10749593

    申请日:2003-12-31

    摘要: The present invention relates to 3-cyano-2,4,5-trifluorobenzoyl fluoride and to intermediates for its preparation and to the process for the preparation of 3-cyano-2,4,5-trifluoro-benzoyl fluoride, which starts from 5-fluoro-1,3-xylene (VIII); which is bichlorinated in the ring in the presence of a catalyst under ionic conditions to give 2,4-dichloro-5-fluoro-1,3-dimethylbenzene (VII). The latter is chlorinated in the side chains under free-radical conditions to give 2,4-dichloro-5-fluoro-3-dichloromethyl-1-trichloromethylbenzene (VI). The latter is hydrolysed via 2,4-dichloro-5-fluoro-3-dichloromethylbenzoic acid (V), which can be isolated if necessary, to give 2,4-dichloro-5-fluoro-3-formyl-benzoic acid (IV), the aldehyde group of which is reacted to give 2,4-dichloro-5-fluoro-3-N-hydroxyiminomethyl-benzoic acid (III), from which, with simultaneous conversion of the carboxyl group into the chlorocarbonyl group, water is eliminated using an acid chloride to give the nitrile 2,4-dichloro-3-cyano-5-fluoro-benzoyl chloride (II). Finally, the nitrile is subjected to fluorine/chlorine exchange.

    摘要翻译: 本发明涉及3-氰基-2,4,5-三氟苯甲酰氟及其制备中间体以及制备3-氰基-2,4,5-三氟 - 苯甲酰氟的方法,其从5 - 氟-1,3-二甲苯(VIII); 其在离子条件下在催化剂存在下在环中二氯化,得到2,4-二氯-5-氟-1,3-二甲基苯(VII)。 后者在自由基条件下在侧链中氯化,得到2,4-二氯-5-氟-3-二氯甲基-1-三氯甲基苯(VI)。 后者通过2,4-二氯-5-氟-3-二氯甲基苯甲酸(V)水解,如果需要可以分离,得到2,4-二氯-5-氟-3-甲酰基 - 苯甲酸(IV ),其醛基反应得到2,4-二氯-5-氟-3-N-羟基亚氨基甲基 - 苯甲酸(III),其中通过同时将羧基转化为氯羰基,水是 使用酰氯除去得到腈2,4-二氯-3-氰基-5-氟 - 苯甲酰氯(II)。 最后,腈进行氟/氯交换。