Process for the preparation of fluorinated benzoic acids
    9.
    发明授权
    Process for the preparation of fluorinated benzoic acids 失效
    氟代苯甲酸的制备方法

    公开(公告)号:US5637765A

    公开(公告)日:1997-06-10

    申请号:US462235

    申请日:1995-06-05

    摘要: A process for the preparation of 2-chloro-4,5-difluorobenzoic acid and 2,4,5-trifluorobenzoic acid as well as synthetic intermediates useful in and prepared according thereto, comprising reacting a nitrobenzene having the formula ##STR1## wherein X is chloro or fluoro, with an appropriate carbanion to form a compound having the formula ##STR2## wherein one of Y and Z is chloro and the other is nitro, and R is a radical selected from the group consisting of --CCl.sub.3, --CH.sub.2 NO.sub.2, --CH(NO.sub.2)R.sup.1, --CH(CO.sub.2 R.sup.1).sub.2, --CH(C(O)R.sup.2).sub.2, --CH(CN)CO.sub.2 R.sup.1, --CH(CO.sub.2 R.sup.1)COR.sup.2 and --COR.sup.2 where R.sup.1 is alkyl or arylalkyl and R.sup.2 is alkyl, aryl or arylalkyl and, where appearing more than once in such a radical, R.sup.1 and R.sup.2 may be the same or different at each occurrence.

    摘要翻译: 一种制备2-氯-4,5-二氟苯甲酸和2,4,5-三氟苯甲酸的方法,以及可用于和制备的合成中间体,包括使具有下式的硝基苯:其中X为 氯或氟,与适当的碳负离子形成具有下式的化合物:硝基,R是选自-CCl 3,-CH 2 NO 2,-CH(NO 2)R 1,-CH(CO 2 R 1) 2,-CH(C(O)R 2)2,-CH(CN)CO 2 R 1,-CH(CO 2 R 1)COR 2和-COR 2,其中R 1是烷基或芳基烷基,R 2是烷基,芳基或芳烷基,并且其中出现多于一次 在这样的基团中,R 1和R 2可以在每次出现时相同或不同。