Preparation of 3,4-difluorobenzotrifluoride
    11.
    发明授权
    Preparation of 3,4-difluorobenzotrifluoride 失效
    制备3,4-二氟三氟甲苯

    公开(公告)号:US4937396A

    公开(公告)日:1990-06-26

    申请号:US276711

    申请日:1988-11-28

    IPC分类号: C07C17/20 C07C255/50

    CPC分类号: C07C255/50 C07C17/208

    摘要: 3,4-Difluorobenzotrifluoride is prepared by contacting a 3,4-dihalobenzotrifluoride with an effective amount of KF or CsF in a polar aprotic solvent at an elevated temperature under substantially anhydrous conditions. The product can be removed as it is formed or the reaction may be run at the autogenous pressures generated by the reaction mixture in a sealed reactor.

    摘要翻译: 通过在极性非质子溶剂中在高温下在基本上无水的条件下使3,4-二卤代三氟甲苯与有效量的KF或CsF接触来制备3,4-二氟三氟甲苯。 产物可以在其形成时被除去,或者反应可以在密封反应器中由反应混合物产生的自生压力下进行。

    Process for preparing substituted benzotrihalides
    12.
    发明授权
    Process for preparing substituted benzotrihalides 失效
    取代苯并三卤化物的制备方法

    公开(公告)号:US4334111A

    公开(公告)日:1982-06-08

    申请号:US878845

    申请日:1978-02-17

    CPC分类号: C07C17/363 C07C51/58

    摘要: Benzotrihalides are prepared by pyrolyzing a substituted phenyl trihaloacetate of the formula ##STR1## wherein each X is halo, nitro, alkyloxy, aryloxy, aralkyoxy, cyano, lower alkyl, haloalkyl, haloalkyloxy, alkenyl, haloalkenyl, carbamoyl, N,N-dialkylcarbamoyl, N,N-diarylcarbamoyl, or N,N-diaralkyloxy;Y is halo; andn is an integer of from 1 to 5. As an example, 4-chlorophenyl trichloroacetate is pyrolyzed at 550.degree. C. to 4-chlorobenzotrichloride.

    摘要翻译: 苯并三卤化物是通过热分解式为“IMAGE”的取代的三卤代苯基苯,其中每个X是卤素,硝基,烷氧基,芳氧基,芳烷氧基,氰基,低级烷基,卤代烷基,卤代烷氧基,烯基,卤代烯基,氨基甲酰基,N,N-二烷基氨基甲酰基, N,N-二芳基氨基甲酰基或N,N-二芳烷氧基; Y是卤素; n为1〜5的整数。作为实例,将三氯乙酸4-氯苯酯在550℃下热解成4-氯三氯甲苯。

    Process for preparing hydroxybenzocyclobutenes
    18.
    发明授权
    Process for preparing hydroxybenzocyclobutenes 失效
    制备羟基苯甲酸的方法

    公开(公告)号:US5227536A

    公开(公告)日:1993-07-13

    申请号:US922651

    申请日:1992-07-30

    CPC分类号: C07C37/02 C07C2102/06

    摘要: A process for preparing a 3- or 4-hydroxybenzocyclobutene comprises reacting a 3- or 4-halogenzocyclobutene reactant with an alkali metal hydroxide by heating in an aqueous alcohol medium at a temperature from about 50.degree. C. to a temperature at which dimerization or oligomerization of a benzocyclobutene reactant or product is a significant side reaction, in the presence of a metal-containing catalyst, for a time sufficient to convert the halobenzocyclobutene reactant to the hydroxybenzocyclobutene product.

    摘要翻译: 制备3-或4-羟基苯并环丁烯的方法包括使3-或4-卤代环丁烯反应物与碱金属氢氧化物在约50℃的温度下在含水醇介质中加热至二聚或低聚 苯并环丁烯反应物或产物是在含金属的催化剂存在下足够将卤代苯并环丁烯反应物转化为羟基苯并环丁烯产物的时间的显着副反应。