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444 条记录 (耗时 0.018 秒)

    Process for the preparation of alkyl carbamates
    61.
    发明授权
    Process for the preparation of alkyl carbamates 失效
    制备烷基氨基甲酸酯的方法

    公开(公告)号：US5502241A

    公开(公告)日：1996-03-26

    申请号：US307393

    申请日：1994-09-16

    申请人： Raghunath V. Chaudhari ,  Sunil P. Gupte ,  Ashutosh A. Kelkar ,  Devidas S. Kolhe, deceased

    发明人： Raghunath V. Chaudhari ,  Sunil P. Gupte ,  Ashutosh A. Kelkar ,  Devidas S. Kolhe, deceased

    IPC分类号： C07C269/00 ,  C07C269/04

    CPC分类号： C07C269/04 ,  C07C269/00

    摘要： The invention relates to an efficient process for the preparation of methyl methyl carbamate by reacting methyl amine or N,N'-dimethyl urea with carbon monoxide, an oxidizing agent and a monoalcohol in the presence of a catalyst system including(i) a precursor selected from the group consisting of platinum group metals and soluble compounds of platinum group metals, and (ii) a promoter comprising at least one halogen containing compound selected from the group consisting of alkali metal halides, alkaline earth metal halides, quaternary ammonium halides, oxo acids of halogen atoms and their salts, and complex compounds containing halogen ions, organic halides and halogen molecules.

    摘要翻译： 本发明涉及一种在催化剂体系存在下使甲基胺或N，N'-二甲基脲与一氧化碳，一种氧化剂和一元醇反应来制备甲基氨基甲酸甲酯的有效方法，该催化剂体系包括（i）所选择的前体 由铂族金属和铂族金属的可溶性化合物组成的组，和（ii）包含至少一种选自碱金属卤化物，碱土金属卤化物，季铵卤化物，含氧酸的含卤素化合物的助催化剂 的卤素原子及其盐，以及含有卤素离子，有机卤化物和卤素分子的络合物。

    Method of preparing an intermediate for the manufacture of bambuterol
    67.
    发明授权
    Method of preparing an intermediate for the manufacture of bambuterol 失效
    制备BAMBUTEROL制造中间体的方法

    公开(公告)号：US5200551A

    公开(公告)日：1993-04-06

    申请号：US741424

    申请日：1991-07-31

    申请人： Peter Jaksch

    发明人： Peter Jaksch

    IPC分类号： C07C269/00 ,  C07C269/04 ,  C07C271/44

    CPC分类号： C07C269/04

    摘要： The present invention relates to an improved method for the preparation of an intermediate for bambuterol, i.e. for the preparation of 2'-bromo-3,5-di[N,N-dimethylcarbamoyloxy]acetophenone (1), by reacting 3,5-dihydroxyacetophenone with N,N-dimethylcarbamoylchloride in ethyl acetate, isopropylacetate, butylacetate, ethylmethylketone or isobutylmethylketone as a solvent with small amount of pyridine as a catalyst and using crystallized potassium carbonate as a base, quenching with water, removing the solvent and dissolving of the resulting 3,5-di[N,N-dimethylcarbamoyloxy]acetophenone in ethyl acetate, to which dissolved hydrogen bromide is added and then bromine, whereupon the resulting intermediate (1) is collected in the form of crystals.

    摘要翻译： PCT No.PCT / SE90 / 00792 Sec。 371日期1991年7月31日 102（e）日期1991年7月31日PCT 1990年11月20日PCT PCT。 公开号WO91 / 08197 日本6月13日，1991年。本发明涉及一种制备班布特罗中间体的改进方法，即制备2'-溴-3,5-二[N，N-二甲基氨基甲酰氧基]苯乙酮（1） 通过使3,5-二羟基苯乙酮与N，N-二甲基氨基甲酰氯在乙酸乙酯，乙酸异丙酯，乙酸丁酯，乙基甲基酮或异丁基甲基酮中作为溶剂与少量吡啶作为催化剂反应，并使用结晶碳酸钾作为碱，用水淬灭，除去 将所得的3,5-二[N，N-二甲基氨基甲酰氧基]苯乙酮溶解在乙酸乙酯中并溶解，加入溶解的溴化氢，然后加入溴，由此得到的中间体（1）以晶体的形式收集。

    Process for producing carbamates
    70.
    发明授权
    Process for producing carbamates 失效
    生产碳酸钙的方法

    公开(公告)号：US5091556A

    公开(公告)日：1992-02-25

    申请号：US500405

    申请日：1990-03-28

    申请人： Carlo Calderoni ,  Franco Mizia ,  Franco Rivetti ,  Ugo Romano

    发明人： Carlo Calderoni ,  Franco Mizia ,  Franco Rivetti ,  Ugo Romano

    IPC分类号： C07C269/04 ,  C07C271/24 ,  C07C271/28

    CPC分类号： C07C269/04

    摘要： A process for preparing carbamates is disclosed, in which:a stoichiometric or higher-than-stoichiometric amount of an alkyl carbonate or a cycloalkyl carbonate is reacted with an aliphatic, cycloaliphatic or aromatic amine, in a first reaction step, by operating in the presence of a carbamation catalyst, in order to produce a mixture of a carbamate and an urea,the urea contained in the reaction product from the first process step is reacted with carbonate, in a second reaction step, in order to produce the corresponding carbamate, andthe reaction mixture coming from the second process step is submitted to treatments in order to recover the carbamate.The process makes it possible high yields and high values of selectivity to the useful reaction product to be obtained.