Fluorine-containing acetophenones optionally halogenated on the CH.sub.3
-group and their precurser fluorine-containing benzonitriles
    35.
    发明授权
    Fluorine-containing acetophenones optionally halogenated on the CH.sub.3 -group and their precurser fluorine-containing benzonitriles 失效
    任选在CH3-基上卤化的含氟苯乙酮及其前体含氟苯腈

    公开(公告)号:US5142092A

    公开(公告)日:1992-08-25

    申请号:US739738

    申请日:1991-07-30

    摘要: Fluorine-containing acetophenones, optionally halogenated on the CH.sub.3 group, of the formula ##STR1## in which X represents hydrogen, chlorine or bromine and the radicals R.sub.1 to R.sub.5 have the following meaning,a) R.sub.1 and R.sub.4 denote fluorine, R.sub.2 and R.sub.5 denote chlorine and R.sub.3 denotes CF.sub.3, orb) R.sub.1, R.sub.3 and R.sub.4 denote fluorine and R.sub.2 and R.sub.5 denote hydrogen, orc) R.sub.1, R.sub.4 and R.sub.5 denote hydrogen, R.sub.2 denotes chlorine and R.sub.3 denotes CF.sub.3, ord) R.sub.1, R.sub.4 and R.sub.5 denote hydrogen, R.sub.2 denotes chlorine and R.sub.3 denotes OCF.sub.3, ore) R.sub.1, R.sub.4 and R.sub.5 denote hydrogen and R.sub.2 and R.sub.3 denote CF.sub.3, orf) R.sub.1 denotes chlorine, R.sub.2 denotes CF.sub.3 and R.sub.3, R.sub.4 and R.sub.5 denote hydrogen, org) R.sub.1 denotes chlorine, R.sub.2, R.sub.3 and R.sub.4 denote hydrogen and R.sub.5 denotes CF.sub.3, orh) R.sub.1 denotes chlorine, R.sub.2, R.sub.4 and R.sub.5 denote hydrogen and R.sub.3 denotes CF.sub.3and a process for their preparation from the corresponding fluorinated benzonitriles or benzyl halides by reaction with an organomagnesium compound capable of introducing methyl groups and subsequent hydrolysis, if appropriate followed by a chlorination or bromination.

    摘要翻译: 其中X表示氢,氯或溴,R 1至R 5基团的式(I)中任选卤代的含氟苯乙酮具有下列含义:a)R 1和R 4表示氟,R 2 或R 3表示CF 3,或b)R 1,R 3和R 4表示氟,R 2和R 5表示氢,或c)R 1,R 4和R 5表示氢,R 2表示氯,R 3表示CF 3,或d) R4和R5表示氢,R2表示氯,R3表示OCF3,或e)R1,R4和R5表示氢,R2和R3表示CF3,或f)R1表示氯,R2表示CF3和R3,R4和R5表示氢, 或g)R 1表示氯,R 2,R 3和R 4表示氢,R 5表示CF 3,或h)R 1表示氯,R 2,R 4和R 5表示氢,R 3表示CF 3,以及由相应的氟化苯腈或苄基 通过与能够引入甲基的有机镁化合物反应并随后h进行卤化反应 如果合适,然后进行氯解或溴化。

    Preparation of 3-bromo-4-fluorotoluene
    40.
    发明授权
    Preparation of 3-bromo-4-fluorotoluene 失效
    3-溴-4-氟甲苯的制备

    公开(公告)号:US4351974A

    公开(公告)日:1982-09-28

    申请号:US233413

    申请日:1981-02-11

    CPC分类号: C07C17/12

    摘要: In the preparation of 3-bromo-4-fluorotoluene by reacting 4-fluorotoluene with bromine, the improvement which comprises effecting the bromination in glacial acetic acid in the presence of iodine and iron or an iron salt. As a result the proportion of 3-bromo-4-fluorotoluene relative to its 2-bromo-4-fluorotoluene isomer is markedly increased.

    摘要翻译: 在通过4-氟甲苯与溴反应制备3-溴-4-氟甲苯的过程中,其改进包括在碘和铁或铁盐存在下在冰醋酸中进行溴化。 结果,3-溴-4-氟甲苯相对于其2-溴-4-氟甲苯异构体的比例明显增加。