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62 条记录 (耗时 0.019 秒)

    Preparation of 1-alkylimidazoles
    31.
    发明授权
    Preparation of 1-alkylimidazoles 失效
    1-烷基咪唑的制备

    公开(公告)号：US4864030A

    公开(公告)日：1989-09-05

    申请号：US238121

    申请日：1988-08-30

    申请人： Hermann Koehler ,  Toni Dockner ,  Helmut Karn

    发明人： Hermann Koehler ,  Toni Dockner ,  Helmut Karn

    IPC分类号： C07D233/90

    CPC分类号： C07D233/90

    摘要： Process for the preparation of 1-alkylimidazoles of the general formula (I) ##STR1## where R.sup.1 is alkyl, R.sup.2 and R.sup.3 are hydrogen, alkyl, aryl, arylalkyl, or alkylaryl, R.sup.4 is carboxy, alkoxycarbonyl R.sup.5 OCC--, carbamoyl, or cyano, and R.sup.5 is an alkyl of from 1 to 8 carbon atoms--by the reaction of imidazoles of the general formula (II) ##STR2## with dialkyl sulfates of the general formula (III)(R.sup.1 O).sub.2 SO.sub.2 (III)at elevated temperatures in the presence of a carboxylic acid or anhydride or of both acid and anhydride.

    摘要翻译： 制备通式（I）的1-烷基咪唑的方法其中R 1是烷基，R 2和R 3是氢，烷基，芳基，芳基烷基或烷基芳基，R 4是羧基，烷氧基羰基，R 5 OCC - ，氨基甲酰基 ，或氰基，R 5是1至8个碳原子的烷基 - 通式（II）的咪唑与（II）的二烷基硫酸盐（R 1 O）2 SO 2（ III）在羧酸或酸酐或酸和酸酐的存在下在升高的温度下进行。

    3,4,-dihydro-2H-pyrans
    32.
    发明授权
    3,4,-dihydro-2H-pyrans 失效
    3,4， - 二氢-2H-吡喃

    公开(公告)号：US4845247A

    公开(公告)日：1989-07-04

    申请号：US76612

    申请日：1987-07-23

    申请人： Wolfgang Spiegler ,  Norbert Goetz ,  Manfred Sauerwald ,  Toni Dockner ,  Rolf Fischer

    发明人： Wolfgang Spiegler ,  Norbert Goetz ,  Manfred Sauerwald ,  Toni Dockner ,  Rolf Fischer

    IPC分类号： C07D309/22 ,  C07D309/28 ,  C07D309/32

    CPC分类号： C07D309/32 ,  C07D309/22 ,  C07D309/28

    摘要： 3,4-dihydro-2H-pyrans I ##STR1## where R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are each H or C.sub.1 -C.sub.6 -alkyl and R.sup.3 is not C.sub.2 -C.sub.4 -alkyl when A is COOR.sup.5 and A is COOR.sup.5, .dbd.CHOR.sup.5, in which R.sup.5 is C.sub.1 -C.sub.4 -alkyl, or CH.sub.2 OR.sup.6, in which R.sup.6 is C.sub.1 -C.sub.4 -alkyl or is benzyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 -alkyl, alkoxy or halogen, or is formyl, C.sub.2 -C.sub.4 -alkylcarbonyl or benzoyl which is unsubstituted or substituted by C.sub.1 -C.sub.4 -alkyl, alkoxy or halogen, are prepared by eliminating an alcohol from a 2-alkoxytetrahydropyran II ##STR2## where R.sup.7 is C.sub.1 -C.sub.18 -alkyl and A' is COOR.sup.5, CH(OR.sup.5).sub.2 or CH.sub.2 OR.sup.6, in which R.sup.5 and R.sup.6 have the meanings stated for I, the elimination being carried out by passing II, in the liquid or gaseous state, into a high boiling mineral oil at above the boiling point of the resulting dihydropyran I, removing I in gaseous form, replenishisng the high boiling mineral oil when it becomes enriched with byproducts, and removing the said mineral oil enriched with byproducts.

    摘要翻译： 3,4-二氢-2H-吡喃酮其中R 1，R 2，R 3和R 4各自是H或C 1 -C 6烷基，当A是COOR 5 + L时，R 3不是C 2 -C 4 - 烷基，A是 COOR 5 = CHOR 5，其中R 5是C 1 -C 4 - 烷基或CH 2 OR 6，其中R 6是C 1 -C 4烷基或是未被取代或被C 1 -C 4 - 烷基，烷氧基或卤素取代的苄基，或是甲酰基， 未取代或被C 1 -C 4 - 烷基，烷氧基或卤素取代的C 2 -C 4 - 烷基羰基或苯甲酰基通过从2-烷氧基四氢吡喃II中除去醇来制备，其中R 7是C 1 -C 18烷基和A' 是COOR 5，CH（OR 5）2或CH 2 OR 6，其中R 5和R 6具有I所述的含义，通过使II在液体或气态下进行的消除在高于沸点的高沸点矿物油中进行 的所得二氢吡喃I，除去气体形式的I，当富含副产物时补充高沸点矿物油，并除去富含副产物的所述矿物油。

    Preparation of 4(5)-nitroimidazole-5(4)-carboxylic acids
    33.
    发明授权
    Preparation of 4(5)-nitroimidazole-5(4)-carboxylic acids 失效
    4（5） - 硝基咪唑-5（4） - 羧酸的制备

    公开(公告)号：US4803283A

    公开(公告)日：1989-02-07

    申请号：US126867

    申请日：1987-11-30

    申请人： Toni Dockner ,  Uwe Kempe ,  Hermann Koehler

    发明人： Toni Dockner ,  Uwe Kempe ,  Hermann Koehler

    IPC分类号： C07D233/92 ,  C07D233/91

    CPC分类号： C07D233/92

    摘要： 4(5)-nitroimidazole-5(4)-carboxylic acids are prepared by reacting an imidazole-4(5)-carboxylic acid with a mixture of sulfuric acid and nitric acid at not less than 80.degree. C., the water content of the reaction mixture at the beginning of the reaction being no higher than 5% by weight, based on the reaction mixture.

    摘要翻译： 通过使咪唑-4（5） - 羧酸与硫酸和硝酸的混合物在不低于80℃下反应制备4（5） - 硝基咪唑-5（4） - 羧酸， 基于反应混合物，反应开始时的反应混合物不高于5重量％。

    Continuous preparation of alkyl esters of (meth)acrylic acid
    39.
    发明授权
    Continuous preparation of alkyl esters of (meth)acrylic acid 失效
    连续制备（甲基）丙烯酸的烷基酯

    公开(公告)号：US5883288A

    公开(公告)日：1999-03-16

    申请号：US791052

    申请日：1997-01-28

    申请人： Gabriele Iffland ,  Albrecht Dams ,  Alexander Weck ,  Heinrich Aichinger ,  Holger Herbst ,  Gerhard Nestler ,  Herbert Exner ,  Willi Schmidt ,  Matthias Geisendorfer ,  Toni Dockner

    发明人： Gabriele Iffland ,  Albrecht Dams ,  Alexander Weck ,  Heinrich Aichinger ,  Holger Herbst ,  Gerhard Nestler ,  Herbert Exner ,  Willi Schmidt ,  Matthias Geisendorfer ,  Toni Dockner

    IPC分类号： B01J27/02 ,  B01J31/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C69/54 ,  C07C69/52

    CPC分类号： C07C67/08

    摘要： In the process for the continuous preparation of alkyl esters of (meth)acrylic acid by reacting (meth)acrylic acid with monohydric alkanols having from 1 to 8 carbon atoms in the presence of an acid esterification catalyst in a reaction zone, there is discharged from the reaction zone a product mixture which comprises the alkyl (meth)acrylate formed, the catalyst and the by-products formed during the course of the esterification having boiling points higher than that of the alkyl (meth)acrylate, and from which the alkyl (meth)acrylate is separated by distillation in a separation zone. The product mixture discharged from the reaction zone is fed to a rectification unit (I), in this unit the product mixture discharged is separated by rectification into at least one product (I) comprising the alkyl ester of (meth)acrylic acid and a product (II) comprising the catalyst, the product (I) is fed to a further rectification unit (II) and in this the alkyl ester of (meth)acrylic acid is separated off by rectification.

    摘要翻译： 在反应区酸性酯化催化剂存在下，使（甲基）丙烯酸与具有1〜8个碳原子的一元链烷醇反应连续制备（甲基）丙烯酸烷基酯的方法中， 所述反应区包含形成的（甲基）丙烯酸烷基酯，在酯化过程中形成的催化剂和副产物的沸点高于（甲基）丙烯酸烷基酯的产物混合物，并且烷基（ 甲基）丙烯酸酯在分离区中蒸馏分离。 将从反应区排出的产物混合物供给到精馏单元（I），在该单元中，排出的产物混合物通过精馏分离成至少一种包含（甲基）丙烯酸的烷基酯的产物（I）和产物 （II），将产物（I）进料到另一精馏单元（II）中，通过精馏分离（甲基）丙烯酸的烷基酯。