Process for the nitration of diphenylethers
    61.
    发明授权
    Process for the nitration of diphenylethers 失效
    硝基二苯醚的工艺

    公开(公告)号:US6028219A

    公开(公告)日:2000-02-22

    申请号:US901545

    申请日:1997-07-28

    CPC classification number: C07C201/08 C07C303/40

    Abstract: A process for the preparation of a compound of general formula I: ##STR1## wherein: R.sup.1 is hydrogen or C.sub.1 -C.sub.6 alkyl, C.sub.2 -C.sub.6 alkenyl or C.sub.2 -C.sub.6 alkynyl, any of which may optionally be substituted with one or more substituents selected from halogen and OH; or COOR.sup.4, COR.sup.6, CONR.sup.4 R.sup.5 or CONHSO.sub.2 R.sup.4 ;R.sup.4 and R.sup.5 are each independently hydrogen or C.sub.1 -C.sub.4 alkyl optionally substituted with one or more halogen atoms;R.sup.6 is a halogen atom or a group R.sup.4 ;R.sup.2 is hydrogen or halo;R.sup.3 is C.sub.1 -C.sub.4 alkyl, C.sub.2 -C.sub.4 alkenyl or C.sub.2 -C.sub.4 alkynyl, any of which may optionally be substituted with one or more halogen atoms; or halo;the process comprising reacting a compound of general formula II: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are as defined for general formula I; with a nitrating agent comprising nitric acid or a mixture of nitric and sulphuric acids in the presence of an organic solvent and in the presence of acetic anhydride, characterized in that the molar ratio of acetic anhydride to compound of general formula II is from about 1:1 to 3:1.

    Abstract translation: 一种制备通式I化合物的方法:其中:R 1是氢或C 1 -C 6烷基,C 2 -C 6烯基或C 2 -C 6炔基,其中任何一个可以被一个或多个选自卤素和 哦; 或COOR4,COR6,CONR4R5或CONHSO2R4; R 4和R 5各自独立地为氢或任选被一个或多个卤素原子取代的C 1 -C 4烷基; R6是卤素原子或基团R4; R2是氢或卤素; R 3是C 1 -C 4烷基,C 2 -C 4烯基或C 2 -C 4炔基,其中任何一个可以任选被一个或多个卤素原子取代; 或卤素; 所述方法包括使通式II的化合物:其中R 1,R 2和R 3如通式I所定义; 与硝酸和硝酸和硫酸的混合物在有机溶剂的存在下和在乙酸酐存在下的硝化剂,其特征在于乙酸酐与通式II的化合物的摩尔比为约1: 1到3:1。

    Process for the preparation of 5-fluoro-2-nitrobenzoic acid
    65.
    发明授权
    Process for the preparation of 5-fluoro-2-nitrobenzoic acid 失效
    5-氟-2-硝基苯甲酸的制备方法

    公开(公告)号:US5756831A

    公开(公告)日:1998-05-26

    申请号:US667833

    申请日:1996-06-20

    CPC classification number: C07C201/08

    Abstract: 5-Fluoro-2-nitrobenzoic acid having low contents of 3-fluoro-2-nitro-benzoic acid is prepared in a simple manner by nitrating 3-fluorobenzoic acid in an anhydrous medium using an anhydrous nitrating acid and isolating and purifying 5-fluoro-2nitro-benzoic acid, by taking 7.5 to 15 parts by weight of water, based on 1 part by weight of 3-fluorobenzoic acid used, introducing the reaction mixture reacted to exhaustion into this volume of water taken, filtering off the precipitate formed and washing it with water.

    Abstract translation: 通过使用无水硝酸将氮氟酸在无水介质中硝化3-氟苯甲酸,分离纯化5-氟-2-硝基苯甲酸,得到3-氟-2-硝基 - 苯甲酸含量低的5-氟-2-硝基苯甲酸 -2-硝基 - 苯甲酸,通过使用7.5重量份水,以1重量份所用的3-氟苯甲酸为原料,将反应混合物反应至该体积的水中,滤出形成的沉淀物, 用水冲洗。

    2-trifluoromethyl-4-chlorobenzalchloride and
2-methyl-3-nitro-5-chlorobenzotrifluoride useful as intermediates for
preparing 2-methyl-3-aminobenzotrifluoride
    68.
    发明授权
    2-trifluoromethyl-4-chlorobenzalchloride and 2-methyl-3-nitro-5-chlorobenzotrifluoride useful as intermediates for preparing 2-methyl-3-aminobenzotrifluoride 失效
    2-三氟甲基-4-氯二氯二氯甲烷和2-甲基-3-硝基-5-氯三氟甲苯,用作制备2-甲基-3-氨基三氟甲苯的中间体

    公开(公告)号:US5600036A

    公开(公告)日:1997-02-04

    申请号:US467678

    申请日:1995-06-06

    CPC classification number: C07C201/08 C07C17/12 C07C17/23 C07C209/36 C07C25/13

    Abstract: 2-Trifluoromethyl-4-chloro-benzalchloride and 2-methyl-3-nitro-5-chlorobenzotrifluoride, are intermediates in a process of preparing 2-methyl-3-aminobenzo-trifluoride. In this process, 2-trifluoromethyl-4-chlorobenzal-chloride is prepared by chlorinating o-trifluoromethylbenzalhalide, and 2-methyl-3-nitro-5-chlorobenzotrifluoride is prepared at first by hydrogenating the 2-trifluoro-methyl-4-chlorobenzalhalide to form a 2-methyl-5-monochlorobenzotrifluoride and then by nitrating the 2-methyl-5-monochlorobenzotrifluoride. Following this process, 2-methyl-3-aminobenzotrifluoride (MA-BTF) is prepared by hydrogenating the 2-methyl-3-nitro-5-chlorobenzotrifluoride. The thus prepared 2-methyl-3-aminobenzotrifluoride is useful as an intermediate in preparing medicines, agricultural chemicals and other chemical products.

    Abstract translation: 2-三氟甲基-4-氯 - 亚苄基氯和2-甲基-3-硝基-5-氯三氟甲苯是制备2-甲基-3-氨基苯并三氟化氮的中间体。 在此过程中,通过氯化邻 - 三氟甲基苯甲酰卤来制备2-三氟甲基-4-氯二氯苄氯,首先通过将2-三氟甲基-4-氯亚苄基卤化氢氢化成2-甲基-3-硝基-5-氯三氟甲苯 形成2-甲基-5-单氯三氟甲苯,然后硝化2-甲基-5-单氯三氟甲苯。 在该方法之后,通过氢化2-甲基-3-硝基-5-氯三氟甲苯来制备2-甲基-3-氨基三氟甲苯(MA-BTF)。 由此制备的2-甲基-3-氨基三氟甲苯可用作制备药物,农药和其它化学产品的中间体。

    Process for the production of dinitrobenzene and mononitrobenzene
    69.
    发明授权
    Process for the production of dinitrobenzene and mononitrobenzene 失效
    生产二硝基苯和单硝基苯的方法

    公开(公告)号:US5488187A

    公开(公告)日:1996-01-30

    申请号:US290575

    申请日:1994-08-15

    Inventor: Robert W. Mason

    CPC classification number: C07C201/08 C07C201/16

    Abstract: Aromatic nitration reactions and, more specifically, a process for nitrating benzene to produce dinitrobenzene or mononitrobenzene in the absence of sulfuric acid and in the absence of any dipolar aprotic solvent.

    Abstract translation: 更具体地说,是在不存在硫酸的情况下和在不存在任何偶极非质子溶剂的情况下硝化苯以产生二硝基苯或单硝基苯的方法。

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