Process for the preparation of
4,4-dimethyl-1-(p-chlorophenyl)pentan-3-one
    1.
    发明授权
    Process for the preparation of 4,4-dimethyl-1-(p-chlorophenyl)pentan-3-one 失效
    制备4,4-二甲基-1-(对氯苯基)戊-3-酮的方法

    公开(公告)号:US4956505A

    公开(公告)日:1990-09-11

    申请号:US375761

    申请日:1989-07-05

    摘要: 4,4-Dimethyl-1-(p-chlorophenyl)pentan-3-one can be prepared by condensation of pinacolone and p-chlorobenzaldehyde in an alcohol as solvent in the presence of an inorganic base and by subsequent hydrogenation, in which the reaction mixture obtained in the condensation is hydrogenated directly without isolation of the intermediate 4,4-dimethyl-1-(p-chlorophenyl)-1-penten-3-one after the addition of a hydrogenation catalyst at elevated temperature and superatmospheric pressure to give 4,4-dimethyl-1-(p-chlorophenyl)pentan-3-one, after the hydrogenation catalyst has been separated off from the liquid hydrogenation mixture, the alcohol is largely distilled off, and the water content of the bottom product of the distillation is adjusted in such a manner that it separates into an aqueous and an organic phase, and the 4,4-dimethyl-1-(p-chlorophenyl)pentan-3-one is recovered from the organic phase.

    摘要翻译: 4,5-二甲基-1-(对氯苯基)戊-3-酮可以通过频多卡酮和对氯苯甲醛在醇作为溶剂中,在无机碱存在下并通过随后的氢化进行缩合来制备,其中反应 在高温和超大气压下加入氢化催化剂后,在冷凝中获得的混合物直接氢化直接分离中间体4,4-二甲基-1-(对氯苯基)-1-戊烯-3-酮,得到4 ,4-二甲基-1-(对氯苯基)戊-3-酮,在氢化催化剂与液体氢化混合物分离后,大部分蒸馏除去醇,蒸馏塔底产物的含水量 以分离成水相和有机相的方式进行调节,从有机相中回收4,4-二甲基-1-(对氯苯基)戊-3-酮。

    Process for the purification of phosphorus oxychloride
    2.
    发明授权
    Process for the purification of phosphorus oxychloride 失效
    磷酰氯的纯化方法

    公开(公告)号:US5911962A

    公开(公告)日:1999-06-15

    申请号:US113988

    申请日:1998-07-10

    IPC分类号: C01B25/10

    CPC分类号: C01B25/10

    摘要: Impure POCl.sub.3 is purified by distillation in the presence of high-boiling nitrogen compounds from the group consisting of the substituted pyridines and pyrimidines, the open-chain and cyclic aliphatic amines, the open-chain and cyclic amidines, the guanidines and the aromatic amines.

    摘要翻译: 不饱和POCl 3在高沸点氮化合物存在下,由取代的吡啶和嘧啶,开环和环状脂族胺,开链和环状脒,胍和芳族胺组成的组中进行蒸馏纯化。

    Process for preparing 3-fluoro-4,6-dichlorotoluene
    3.
    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
    4.
    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
    5.
    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
    6.
    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 2-chloroacrylonitrile
    7.
    发明授权
    Process for the preparation of 2-chloroacrylonitrile 失效
    制备2-氯丙烯腈的方法

    公开(公告)号:US5679826A

    公开(公告)日:1997-10-21

    申请号:US735717

    申请日:1996-10-23

    CPC分类号: C07C253/30

    摘要: 2-Chloroacrylonitrile is prepared in a particularly advantageous and readily industrially practicable manner by chlorinating acrylonitrile and then thermally cleaving the 2,3-diehloropropionitrile formed, by chlorinating acrylonitrile in the presence of a catalyst system comprising dimethylformamide and pyridine and/or pyridine derivatives and subjecting the resulting crude 2,3-dichloropropionitrile to thermal cleavage in the presence of the same catalyst system without the addition of further catalysts.

    摘要翻译: 通过氯化丙烯腈,然后在包含二甲基甲酰胺和吡啶和/或吡啶衍生物的催化剂体系存在下,通过氯化丙烯腈热分解形成的2,3-二氯丙腈,制备2-氯丙烯腈, 所得粗制的2,3-二氯丙腈在相同的催化剂体系的存在下进行热裂解而不加入另外的催化剂。

    Process for ring-chlorination of aromatic hydrocarbons
    9.
    发明授权
    Process for ring-chlorination of aromatic hydrocarbons 失效
    芳香烃的环化方法

    公开(公告)号:US5105036A

    公开(公告)日:1992-04-14

    申请号:US651715

    申请日:1991-02-06

    CPC分类号: C07C17/12

    摘要: Aromatic hydrocarbons monosubstituted by straight-chain or branched C.sub.1 -C.sub.12 -alkyl or by Chd 3-C.sub.8 -cycloalkyl can be chlorinated in the aromatic ring in the liquid phase in the presence of Friedel-Crafts catalysts if cyclic amidines which are oxy-sustituted on the exocyclic N atom are employed as co-catalysts. An increased proportion of the p-isomer is obtained in this reaction.

    摘要翻译: 在Friedel-Crafts催化剂存在下,通过直链或支链C1-C12烷基或由Chd 3-C8-环烷基单取代的芳族烃可以在芳烃环中被氯化,如果环状脒被羟基维持在 外环N原子用作助催化剂。 在该反应中获得了比例增加的对异构体。

    Process for the ring chlorination of aromatic hydrocarbons
    10.
    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:US4925994A

    公开(公告)日:1990-05-15

    申请号:US342500

    申请日:1989-04-24

    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 1,6-benzothiazocins are used as co-catalysts. This makes it possible to obtain a higher proportion of p-isomers.

    摘要翻译: 通过直链或支链的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的液相中的Friedel-Crafts催化剂存在下进行氯化,如果使用1,6-苯并噻唑作为 助催化剂。 这使得可以获得较高比例的对异构体。