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    Divinylacetylenes as polymerization inhibitors for acrylic and methacrylic acid
    1.
    发明授权
    Divinylacetylenes as polymerization inhibitors for acrylic and methacrylic acid 失效
    二乙炔基乙烯作为丙烯酸和甲基丙烯酸的聚合抑制剂

    公开(公告)号：US4010082A

    公开(公告)日：1977-03-01

    申请号：US606627

    申请日：1975-08-21

    申请人： Joseph W. Nemec ,  Thomas Stewart

    发明人： Joseph W. Nemec ,  Thomas Stewart

    IPC分类号： C07C51/50 ,  C07C57/04 ,  B01D3/34

    CPC分类号： C07C51/50 ,  Y10S203/22

    摘要： A method is disclosed for inhibiting the polymerization of acrylic and methacrylic acids at ambient or above ambient temperature, such as during preparation, purification or storage of the acids under substantially anaerobic conditions, by adding thereto a polymerization inhibiting amount of a compound having the formula: ##STR1## where R, R', R", R"' are hydrogen, alkyl or aryl.

    摘要翻译： 公开了一种抑制丙烯酸和甲基丙烯酸在环境温度或高于环境温度下聚合的方法，例如在基本上无氧条件下在酸的制备，纯化或储存期间，通过加入聚合抑制量的具有下式的化合物： 其中R，R'，R“，R”'是氢，烷基或芳基。

    Esters of 4-substituted 2-methyleneglutaric acids and method for preparing same
    4.
    发明授权
    Esters of 4-substituted 2-methyleneglutaric acids and method for preparing same 失效
    4-取代的2-亚甲基戊二酸的酯及其制备方法

    公开(公告)号：US4145559A

    公开(公告)日：1979-03-20

    申请号：US521215

    申请日：1974-11-06

    申请人： Joseph W. Nemec ,  Richard B. Wuchter

    发明人： Joseph W. Nemec ,  Richard B. Wuchter

    IPC分类号： C07C69/52

    CPC分类号： C07C69/52

    摘要： Esters of 4-substituted 2-methyleneglutaric acids are prepared by reacting an ester of acrylic acid with an ester of an .alpha.-substituted acrylic acid, such as an ester of methacrylic acid, in the presence of a tertiary organic phosphine, an organic phosphorus triamide, an organic phosphonous diamide, or an organic phosphinous amide.

    摘要翻译： 4-取代的2-亚甲基戊二酸的酯通过丙烯酸酯与α-取代的丙烯酸的酯如甲基丙烯酸的酯在叔有机膦，有机磷三胺的存在下反应来制备 ，有机膦酰胺或有机膦酰胺。