Process for decreasing the halogen content of polyhalogenated aromatics
    21.
    发明授权
    Process for decreasing the halogen content of polyhalogenated aromatics 失效
    减少多卤代芳族化合物卤素含量的方法

    公开(公告)号:US5292975A

    公开(公告)日:1994-03-08

    申请号:US21835

    申请日:1993-02-23

    CPC分类号: C07C17/00

    摘要: When the halogen content of polyhalogenated aromatics is decreased by reaction with monohalogenated and/or non-halogenated aromatics in the gas phase, good yields and significantly improved catalyst service lives are achieved if the reaction is carried out in the presence of a catalyst and in the presence of a hydrogen halide.

    摘要翻译: 当通过在气相中与单卤代和/或非卤代芳族化合物反应来降低多卤代芳族化合物的卤素含量时,如果反应在催化剂存在下进行,则可获得良好的产率和显着改善的催化剂使用寿命 存在卤化氢。

    Process for the preparation of p-dichlorobenzene
    22.
    发明授权
    Process for the preparation of p-dichlorobenzene 失效
    制备二氯苯腈的方法

    公开(公告)号:US5210343A

    公开(公告)日:1993-05-11

    申请号:US854121

    申请日:1992-03-19

    CPC分类号: C07C17/12

    摘要: Dichlorobenzene having an increased p-content and a greatly reduced m-content is obtained by ring chlorination of benzene or chlorobenzene in the presence of Friedel-Crafts catalysts if the reaction is carried out in the presence of co-catalysts of the formula (I) ##STR1## wherein X represents fluorine, chlorine, bromine, trifluoromethyl or pentafluoroethyl andA represents 2 hydrogen atoms or the group --CH.dbd.CH--CH.dbd.CH--.

    摘要翻译: 如果反应在式(I)的助催化剂存在下进行,则在Friedel-Crafts催化剂存在下,通过苯或氯苯的环氯化获得具有增加的p含量和大大降低的m-含量的二氯苯, (I)其中X表示氟,氯,溴,三氟甲基或五氟乙基,A表示2个氢原子或基团-CH = CH-CH = CH-。

    Process for the preparation of 2-chloro-4-nitro-alkylbenzene
    23.
    发明授权
    Process for the preparation of 2-chloro-4-nitro-alkylbenzene 失效
    制备2-氯-4-硝基苯乙烯的方法

    公开(公告)号:US5095157A

    公开(公告)日:1992-03-10

    申请号:US518063

    申请日:1990-05-02

    CPC分类号: C07C201/12

    摘要: In the preparation of 2-chloro-4-nitro-alkylbenzene by reaction of 4-nitro-alkylbenzene with elemental chlorine or chlorine-releasing compounds in the presence of a Friedel-Crafts catalyst in the liquid phase, particularly high selectivities in respect of the target compounds chlorinated exclusively in the 2-position are achieved if a dibenzo-condensed sulphur heterocycle of the formula ##STR1## having the meanings given in the description for R.sup.1 to R.sup.8, X and n, is used as co-catalyst.

    摘要翻译: 在液相中在Friedel-Crafts催化剂存在下,通过4-硝基 - 烷基苯与元素氯或释放氯的化合物的反应制备2-氯-4-硝基 - 烷基苯,特别是在 如果将具有R1至R8,X和n的描述中给出的含义的具有式(IMA)(II)的二苯并稠合硫杂环作为助催化剂,则可实现仅在2-位氯化的目标化合物。

    Process for the ring chlorination of aromatic hydrocarbons
    24.
    发明授权
    Process for the ring chlorination of aromatic hydrocarbons 失效
    芳烃环化氯工艺

    公开(公告)号:US4990707A

    公开(公告)日:1991-02-05

    申请号:US427264

    申请日:1989-10-26

    CPC分类号: C07C17/12

    摘要: Aromatic hydrocarbons which are monosubstituted by straight-chain or branched C.sub.1 -C.sub.12 -alkyl or by C.sub.3 -C.sub.8 -cycloalkyl can be chlorinated in the presence of Friedel-Crafts Catalysts in liquid phase on the aromatic ring if cyclic benzo-fused imines or benzo[f]-1,4-thiazepines are used as co-catalysts. This makes it possible to obtain a higher proportion of p-isomers.

    摘要翻译: 通过直链或支链C 1 -C 12烷基或C 3 -C 8 - 环烷基单取代的芳族烃可以在芳环上在液相中的Friedel-Crafts催化剂存在下氯化,如果环状苯并稠合亚胺或苯并[ f] -1,4-硫杂环庚烷用作助催化剂。 这使得可以获得较高比例的对异构体。

    Process for the preparation of N,N-diaryl-ureas
    25.
    发明授权
    Process for the preparation of N,N-diaryl-ureas 失效
    制备N,N-二芳基脲的方法

    公开(公告)号:US4820871A

    公开(公告)日:1989-04-11

    申请号:US105856

    申请日:1987-10-07

    CPC分类号: C07C273/1827

    摘要: N,N-Diaryl-ureas of the formulaR.sup.1 --NR.sup.2 --CO--NH--R.sup.3whereinR.sup.1 and R.sup.2 denote aryl andR.sup.3 denotes alkyl, aralkyl or aryl, can be prepared by a process in which a diarylamine of the formulaR.sup.1 --NH--R.sup.2is reacted with an isocyanate of the formulaR.sup.3 --NCOwherein R.sup.1, R.sup.2 and R.sup.34 have the above meaning, in the presence of acid compounds and in the presence or absence of an inert solvent and/or diluent at elevated temperature.

    摘要翻译: 式R 1 -R 2 -CO-NH-R 3的N,N-二芳基脲其中R 1和R 2表示芳基,R 3表示烷基,芳烷基或芳基,可以通过其中式R 1 -NH -R2与式R3-NCO的异氰酸酯反应,其中R 1,R 2和R 34具有上述含义,在酸性化合物的存在下和在惰性溶剂和/或稀释剂的存在或不存在下,在升高的温度下反应。

    Process for the preparation of 2-chloro-4-methylphenol
    30.
    发明授权
    Process for the preparation of 2-chloro-4-methylphenol 失效
    2-氯-4-甲基苯酚的制备方法

    公开(公告)号:US5847236A

    公开(公告)日:1998-12-08

    申请号:US710990

    申请日:1996-09-25

    IPC分类号: B01J31/02 C07C37/62 C07C39/28

    摘要: 2-Chloro-4-methylphenol is prepared by reacting 4-methylphenol with a chlorinating agent in the presence of a catalyst system of one or more Lewis acids in a total amount of 0.1-10% by weight and one or more diaryl sulphides in a total amount of 0.1-10% by weight, all based on the amount of 4-methylphenol. The reaction temperature is 0.degree.-100.degree. C. The chlorinating agent is used in an amount of 0.5-1.5 mol per mole of 4-methylphenol. The reaction can be carried out until virtually complete consumption of the 4-methylphenol, high isomeric selectivity and high stage selectivity being observed.

    摘要翻译: 2-氯-4-甲基苯酚是通过使4-甲基苯酚与氯化剂在总量为0.1-10重量%的一种或多种路易斯酸的催化剂体系存在下反应来制备的,一种或多种二芳基硫化物在 总量为0.1-10重量%,均基于4-甲基苯酚的量。 反应温度为0℃-100℃。氯化剂的用量为每摩尔4-甲基苯酚0.5-1.5摩尔。 反应可以进行直到几乎完全消耗4-甲基苯酚,高异构选择性和高阶段选择性被观察到。