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    Method of preparing p-nitrobenzoic acid
    21.
    发明授权
    Method of preparing p-nitrobenzoic acid 失效
    对硝基苯甲酸的制备方法

    公开(公告)号：US4007223A

    公开(公告)日：1977-02-08

    申请号：US535862

    申请日：1974-12-23

    Applicant: Marcel Feld ,  Hermann Richtzenhain

    Inventor： Marcel Feld ,  Hermann Richtzenhain

    IPC: C07B61/00 ,  B01J27/00 ,  B01J31/00 ,  C07C67/00 ,  C07C201/00 ,  C07C201/12 ,  C07C205/57 ,  C07C205/59 ,  C07C51/33

    CPC classification number: C07C205/57 ,  C07C201/12

    Abstract: Process of preparing a not discolored p-nitrobenzoic acid by oxidation of p-nitrotoluene with oxygen, which comprises contacting the oxygen with the p-nitrotoluene in an acetic acid reaction medium and in the presence of a cobalt-containing and bromine-containing catalyst at a temperature of 80.degree. to 150.degree. C. The cobalt is present as a cobalt salt in the amount of 0.01 to 0.1 moles per mole of p-nitrotoluene, and the amount of acetic acid is 3 to 15 moles per mole p-nitrotoluene.

    Abstract translation: 通过用氧氧化对硝基甲苯来制备未变色的对硝基苯甲酸的方法，其包括使氧与对硝基甲苯在乙酸反应介质中并在含钴和溴的催化剂存在下接触 钴的存在量为每摩尔对硝基甲苯0.01至0.1摩尔的钴盐，每摩尔对硝基甲苯的乙酸量为3至15摩尔。

    Process for preparing cyclopropanecarboxylates of lower alcohols
    22.
    发明授权
    Process for preparing cyclopropanecarboxylates of lower alcohols 失效
    制备低级醇的环丙烷羧酸酯的方法

    公开(公告)号：US06730804B1

    公开(公告)日：2004-05-04

    申请号：US09141163

    申请日：1998-08-27

    Applicant: Manfred Kaufhold ,  Marcel Feld

    Inventor： Manfred Kaufhold ,  Marcel Feld

    IPC: C07C6974

    CPC classification number: C07C67/08 ,  C07C69/74

    Abstract: Cyclopropanecarboxylates of lower alcohols are prepared by esterification of the corresponding cyclopropanecarboxylic acids with the corresponding lower alcohols in the presence of an acid catalyst, while maintaining a considerable stoichiometric excess of the cyclopropanecarboxylic acid with respect to the lower alcohol, keeping the temperature at from 100 to 200° C. and distilling off the cyclopropanecarboxylate together with the water of reaction and small amounts of alcohol. Cyclopropanecarboxylates of lower alcohols are valuable intermediates in the pharmaceutical and agrochemical sectors.

    Abstract translation: 低级醇的环丙烷羧酸酯通过相应的环丙烷羧酸与相应的低级醇在酸催化剂存在下酯化而制备，同时相对于低级醇维持相当大的化学计量过量的环丙烷羧酸，保持温度为100至 200℃，并与反应水和少量酒精一起蒸馏出环丙烷羧酸酯。 低级醇的环丙烷羧酸盐是制药和农业部门的有价值的中间体。

    Process for the preparation of amino acid derivatives
    23.
    发明授权
    Process for the preparation of amino acid derivatives 失效
    制备氨基酸衍生物的方法

    公开(公告)号：US06399809B1

    公开(公告)日：2002-06-04

    申请号：US09557413

    申请日：2000-04-21

    Applicant: Wolfgang Kleemiss ,  Marcel Feld

    Inventor： Wolfgang Kleemiss ,  Marcel Feld

    IPC: C07C20500

    CPC classification number: C07C269/00 ,  C07C273/18 ,  C07C271/22 ,  C07C275/16 ,  C07C275/24

    Abstract: Process for the preparation of amino acid derivatives of the general formula I where R1-R4 are as defined herein, from the corresponding malonic acid monoester amides of the general formula II  by Hofmann degradation using a hypohalite in an aqueously basic medium, which comprises carrying out the reaction in the presence of an alcohol or amine and using the hypohalite in amounts of from 1.0 to 1.5 equivalents and the base in amounts of from 0.8 to 4.0 equivalents per mole of starting material II.

    Abstract translation: 由通式II的相应的丙二酸单酯酰胺制备通式Ⅰ的氨基酸衍生物的方法，其通过霍夫曼降解，使用碱性介质中的次卤酸盐，其包括进行 在醇或胺的存在下反应，并使用量为1.0至1.5当量的次卤酸盐和碱的量为每摩尔原料II为0.8至4.0当量。

    Process for preparing potassium monoethyl malonate
    24.
    发明授权
    Process for preparing potassium monoethyl malonate 失效
    制备丙二酸单乙酯的方法

    公开(公告)号：US06172257B2

    公开(公告)日：2001-01-09

    申请号：US09294011

    申请日：1999-04-19

    Applicant: Juergen Muhr ,  Marcel Feld

    Inventor： Juergen Muhr ,  Marcel Feld

    IPC: C07C6938

    CPC classification number: C07C69/38 ,  C07C67/30

    Abstract: A process for preparing potassium monoethyl malonate by selective saponification of malonic acid diethyl ester with potassium hydroxide, in which the potassium hydroxide is added to the malonic acid diethyl ester, malonic acid diethyl ester and potassium hydroxide are used in a molar ratio of at least 1.5 and the potassium hydroxide is effectively distributed into the malonic acid diethyl ester.

    Abstract translation: 使用氢氧化钾选择性皂化丙二酸二乙酯制备丙二酸钾的方法，其中将氢氧化钾加入到丙二酸二乙酯，丙二酸二乙酯和氢氧化钾中，摩尔比为至少1.5 并且氢氧化钾有效地分配到丙二酸二乙酯中。

    Process for the preparation of sodium thiobarbiturate
    28.
    发明授权
    Process for the preparation of sodium thiobarbiturate 失效
    制备硫代巴比妥钠的方法

    公开(公告)号：US5274093A

    公开(公告)日：1993-12-28

    申请号：US930307

    申请日：1992-08-13

    Applicant: Marcel Feld

    Inventor： Marcel Feld

    IPC: C07D239/68 ,  C07D239/02

    CPC classification number: C07D239/68

    Abstract: Sodium thiobarbiturate is prepared by reacting dimethyl malonate, thiourea and sodium methylate in methanol as the solvent at elevated temperatures, preferably at reflux temperature under atmospheric pressure.

    Abstract translation: 硫代巴比妥钠钠是通过使丙二酸二甲酯，硫脲和甲醇钠在甲醇中作为溶剂在升高的温度下，优选在大气压下回流温度下进行反应来制备的。

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