Preparation of dichlorotrifluoromethyltoluenes including novel isomers
    4.
    发明授权
    Preparation of dichlorotrifluoromethyltoluenes including novel isomers 失效
    包括新异构体的二氯三氟甲基甲苯的制备

    公开(公告)号:US4876404A

    公开(公告)日:1989-10-24

    申请号:US084019

    申请日:1987-08-11

    IPC分类号: C07C17/20 C07C17/32 C07C25/13

    摘要: Dichlorotrifluoromethyltoluenes useful in producing some medicines and agricultural chemicals are formed with good yields by reacting dichlorotrichloromethyltoluenes with hydrogen fluoride usually at 0.degree.-100.degree. C. under pressure of 3-20 kg/cm.sup.2. Besides known 3,4-dichloro-6-trifluoromethyltoluene and 3,4-dichloro-5-trifluoromethyltoluene, novel isomers are also obtained by this method.

    摘要翻译: 通常在3-20kg / cm 2的压力下,通常在0℃-100℃下使二氯三氯甲基甲苯与氟化氢反应,形成用于生产一些药物和农药的二氯三氟甲基甲苯。 除了已知的3,4-二氯-6-三氟甲基甲苯和3,4-二氯-5-三氟甲基甲苯之外,还通过该方法获得了新的异构体。

    Preparation of trifluoromethyltoluene from halomethylbenzotrifluoride
    5.
    发明授权
    Preparation of trifluoromethyltoluene from halomethylbenzotrifluoride 失效
    由卤代甲基三氟甲苯制备三氟甲基甲苯

    公开(公告)号:US4849557A

    公开(公告)日:1989-07-18

    申请号:US193061

    申请日:1988-05-12

    IPC分类号: C07C17/23 C07C17/38 C07C22/08

    CPC分类号: C07C22/08 C07C17/23 C07C17/38

    摘要: Trifluoromethyltoluene is obtained from a halomethylbenzotrifluoride, which is a relatively inexpensive material, by hydrogenating the halomethyl group of the starting compound to methyl group with hydrogen gas in the presence of a hydrogenation catalyst and an acid acceptor. Suitable examples of the halomethyl group to be hydrogenated are --CH.sub.2 Cl, --CH.sub.2 F, --CHClF, --CClF.sub.2 and --CF.sub.3. When the starting compound is bis(trifluromethyl)benzene, addition of either an alcohol or an alkali metal fluoride to the reaction system is effective for suppression of formation of xylene as a by-product, and xylene still contained in the reaction product can completely be removed by treatment with a sulfonating agent such as fuming sulfuric acid.

    摘要翻译: 通过在氢化催化剂和酸受体的存在下,用氢气将起始化合物的卤代甲基氢化成甲基,由相对便宜的卤代甲基三氟甲苯得到三氟甲基甲苯。 待氢化的卤代甲基的合适实例是-CH 2 Cl,-CH 2 F,-CHClF,-CClF 2和-CF 3。 当起始化合物为双(三氟甲基)苯时,向反应体系中加入醇或碱金属氟化物对于抑制作为副产物形成二甲苯是有效的,反应产物中仍含有的二甲苯可以完全 通过用磺化剂如发烟硫酸处理除去。

    Method of purifying fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether
    9.
    发明授权
    Method of purifying fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether 失效
    氟甲基-1,1,1,3,3,3-六氟异丙醚的纯化方法

    公开(公告)号:US5763684A

    公开(公告)日:1998-06-09

    申请号:US913507

    申请日:1997-09-16

    CPC分类号: C07C41/36

    摘要: The present invention relates to a method of removing bisfluoromethyl ether contained in fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether in a simple, effective manner, and is characterized in that fluoromethyl-1,1,1,3,3,3-hexafluoroisopropyl ether containing bisfluoromethyl ether is brought into contact with zeolite.

    摘要翻译: PCT No.PCT / JP97 / 00128 Sec。 371日期:1997年9月16日 102(e)1997年9月16日PCT PCT 1997年1月22日PCT公布。 出版物WO97 / 27165 日期1997年7月31日本发明涉及以简单,有效的方式除去氟甲基-1,1,1,3,3,3-六氟异丙醚中所含的双氟甲基醚的方法,其特征在于氟甲基-1, 使含有双氟甲基醚的1,1,3,3,3-六氟异丙基醚与沸石接触。

    Preparation of trifluoromethylbenzoic acid from hexafluoroxylene
    10.
    发明授权
    Preparation of trifluoromethylbenzoic acid from hexafluoroxylene 失效
    从六氟乙烯制备三氟甲基苯甲酸

    公开(公告)号:US4929753A

    公开(公告)日:1990-05-29

    申请号:US183243

    申请日:1988-04-19

    CPC分类号: C07C51/093

    摘要: Trifluoromethylbenzoic acid is obtained at high yield from .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexafluoroxylene, which is a relatively inexpensive compound, by reacting this compound with a strong acid in sulfuric acid which is at least partly fuming sulfuric acid. It is best to use fuming sulfuric acid as the strong acid. The reaction temperature ranges from room temperature to 150.degree. C., though temperatures below 100.degree. C. are preferable. By this reaction only one trifluoromethyl group of hexafluoroxylene is hydrolyzed so far as the strong acid is not in large excess.

    摘要翻译: 通过使该化合物与硫酸中的强酸反应,其中α,α,α,α',α',α'-六氟二苯醚是相对便宜的化合物,以高产率获得三氟甲基苯甲酸,该硫酸至少部分是发烟硫酸 酸。 最好用发烟硫酸作为强酸。 反应温度范围为室温至150℃,尽管温度低于100℃是优选的。 通过该反应,只要一个三氟甲基基团的六氟氧化
    合物被水解,只要强酸不足够过量即可。