Preparation of ortho-aminobenzotrifluoride
    3.
    发明授权
    Preparation of ortho-aminobenzotrifluoride 失效
    邻氨基三氟甲苯的制备

    公开(公告)号:US4469890A

    公开(公告)日:1984-09-04

    申请号:US530152

    申请日:1983-09-07

    摘要: This invention relates to a process for the preparation of ortho-aminobenzotrifluoride (OABT) from benzotrifluoride (BTF). The process provides an overall route employing non-isolation of intermediates which can be run smoothly and which results in the preparation of OABT in high yields with less contamination. This process includes a catalytic halogenation step in which BTF is converted to meta-halo BTF and other mono and di-halo isomers of BTF followed by nitration in the same reaction vessel under conditions which do not favor nitration of the di-halo isomers of BTF to produce a mixture which predominates in 5-halo-2-nitro BTF. In the final step the 5-halo-2-nitro BTF present is reduced and hydrodehalogenated with H.sub.2 in the presence of a catalyst to form OABT. Recyclable BTF is also obtained from the final reaction.

    摘要翻译: 本发明涉及从三氟甲苯(BTF)制备邻氨基三氟甲苯(OABT)的方法。 该方法提供了使用不分离中间体的总体途径,其可以顺利运行,并且其导致OABT的制备成品率高,污染少。 该方法包括催化卤化步骤,其中BTF转化为间位卤素BTF和BTF的其它单和二卤代异构体,然后在不利于BTF的二卤代异构体硝化的相同反应容器中硝化 以产生在5-卤代-2-硝基BTF中占优势的混合物。 在最终步骤中,存在的5-卤代-2-硝基BTF在催化剂存在下用H 2还原并加氢脱卤以形成OABT。 也可从最终反应中获得可循环的BTF。