Process for preparing 3-fluoro-4,6-dichlorotoluene
    32.
    发明授权
    Process for preparing 3-fluoro-4,6-dichlorotoluene 失效
    制备3-氟-4,6-二氯甲苯的方法

    公开(公告)号:US5684217A

    公开(公告)日:1997-11-04

    申请号:US572229

    申请日:1995-12-13

    CPC分类号: C07C17/12

    摘要: 3-Fluoro-4,6-dichlorotoluene can be prepared in a particularly favourable manner by first chlorinating 3-fluorotoluene at low temperature in the presence of a Friedel-Crafts catalyst and a heterocyclic cocatalyst to give a mixture containing 3-fluoro-4-chlorobenzene and 3-fluoro-6-chlorobenzene, and subsequently, without intermediate isolation, further chlorinating this mixture, at higher temperature, after addition of further Friedel-Crafts catalyst and further heterocyclic cocatalyst, to give 3-fluoro-4,6-dichlorotoluene.

    摘要翻译: 3-氟-4,6-二氯甲苯可以以特别有利的方式通过在Friedel-Crafts催化剂和杂环助催化剂的存在下在低温下首先氯化3-氟甲苯,得到含有3-氟-4- 氯苯和3-氟-6-氯苯,随后在不进行中间分离的情况下,在加入另外的Friedel-Crafts催化剂和其它杂环助催化剂之后,在较高温度下进一步氯化该混合物,得到3-氟-4,6-二氯甲苯 。

    Process for the preparation of p-dichlorobenzene
    33.
    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
    34.
    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
    35.
    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。