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18 条记录 (耗时 0.015 秒)

    Process for the preparation of 4'-hydroxybiphenyl-4-carboxylic acid
    13.
    发明公开
    Process for the preparation of 4'-hydroxybiphenyl-4-carboxylic acid 失效
    Verfahren zur Herstellung von 4'-羟基联苯-4-碳。

    公开(公告)号：EP0240362A2

    公开(公告)日：1987-10-07

    申请号：EP87302928.4

    申请日：1987-04-03

    申请人： MITSUI TOATSU CHEMICALS, Inc.

    发明人： Miura, Tohru ,  Nagata, Teruyuki ,  Mizuta, Hideki

    IPC分类号： C07C65/105 ,  C07C51/377 ,  C07C62/06 ,  C07C51/347

    CPC分类号： C07C51/347 ,  C07C51/377 ,  C07C65/105 ,  C07C62/32

    摘要： A process for the preparation of 4ʹ-hydroxy­biphenyl-4-carboxylic acid by reacting a cyclohexanone-­4-carboxylic acid compound with phenol in the presence of an acid catalyst, and then subjecting the resulting 4,4-bis(4-hydroxyphenyl)cyclohexanecarboxylic acid compound to decomposition and dehydrogenation reactions in the presence of a base and a dehydrogenation catalyst. The aforesaid cyclohexanone-4-carboxylic acid compound is obtained by catalytically hydrogenating a 4-hydroxy­benzoic acid compound in a secondary alcohol or tertiary alcohol solvent, and the reaction mixture thus obtained is directly used for the reaction with phenol.

    摘要翻译： 一种通过环己酮-4-羧酸化合物与苯酚在酸催化剂存在下反应制备4'-羟基联苯-4-羧酸的方法，然后将所得的4,4'-双（4-羟基苯基） 环己烷羧酸化合物在碱和脱氢催化剂存在下进行分解和脱氢反应。 上述环己酮-4-羧酸化合物是通过在仲醇或叔醇溶剂中催化氢化4-羟基苯甲酸化合物而得到的，将由此得到的反应混合物直接用于与苯酚反应。

    High purity 1,3-dialkyl-2-imidazolidinone and preparation process of same
    15.
    发明公开
    High purity 1,3-dialkyl-2-imidazolidinone and preparation process of same 失效
    Hochreine 1,3-二烷基-2-咪唑啉酮和Herstellungsverfahren

    公开(公告)号：EP0823427A1

    公开(公告)日：1998-02-11

    申请号：EP97113098.4

    申请日：1997-07-30

    申请人： MITSUI TOATSU CHEMICALS, Inc.

    发明人： Mizuta, Hideki ,  Takaoka, Masazumi ,  Nagata, Teruyuki

    IPC分类号： C07D233/32

    CPC分类号： C07D233/32

    摘要： In a process for reacting N,N'-dialkylethylenediamine with urea in an aprotic polar solvent to prepare 1,3-dialkyl-2-imidazolidinone, a process comprising progressing the reaction while continuously adding N,N'-dialkylethylenediamine and urea into the aprotic polar solvent, is disclosed.
    The process is a high-yield manufacturing process in industry capable of efficiently producing very high purity 1,3-dialkyl-2-imidazolidinone which contains less than 0.1% by weight of by-product 1,3-dialkyl-2-imidazolidinimine derived from the raw materials.

    摘要翻译： 在非质子极性溶剂中使N，N'-二烷基乙二胺与脲反应以制备1,3-二烷基-2-咪唑啉酮的方法，包括进行反应，同时连续加入N，N'-二烷基乙二胺和尿素至非质子传递 极性溶剂。 该方法是能够有效地生产非常高纯度的1,3-二烷基-2-咪唑啉酮的工业中的高产量制备方法，该1,3-二烷基-2-咪唑啉酮含有少于0.1％重量的副产物1,3-二烷基-2-咪唑啉亚胺衍生自 的原料。