Process for the preparation of asymmetrically substituted ureas,
carbamates or thiocarbamates
    1.
    发明授权
    Process for the preparation of asymmetrically substituted ureas, carbamates or thiocarbamates 失效
    制备不对称取代的脲,氨基甲酸酯或硫代氨基甲酸酯的方法

    公开(公告)号:US5248755A

    公开(公告)日:1993-09-28

    申请号:US958155

    申请日:1992-10-09

    IPC分类号: C07C273/18 C07C333/04

    摘要: Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated olefinic double bonds, and a process for the preparation of N-mono- or N,N-disubstituted ureas by reaction of ammonium isocyanate with a primary or secondary amine in a diluent.

    摘要翻译: 通过异氰酸和叔胺的加合物与伯胺和仲胺,醇,硫醇或具有一个或两个非累积烯烃的化合物的反应制备不对称取代的脲,氨基甲酸酯,硫代氨基甲酸酯或取代的异氰酸酯的方法 双键,以及通过异氰酸铵与稀释剂中的伯胺或仲胺反应制备N-单或N,N-二取代脲的方法。

    Process for the preparation of asymmetrically substituted ureas,
carbamates, thiocarbamates and substituted isocyanates
    4.
    发明授权
    Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates and substituted isocyanates 失效
    用于制备不对称取代的脲,氨基甲酸酯,硫代氨基甲酸酯和取代的异氰酸酯的方法

    公开(公告)号:US5481035A

    公开(公告)日:1996-01-02

    申请号:US85815

    申请日:1993-07-06

    IPC分类号: C07C273/18 C07C333/04

    摘要: Process for the preparation of asymmetrically substituted ureas, carbamates, thiocarbamates or substituted isocyanates by reaction of an adduct of isocyanic acid and a tertiary amine with a primary and secondary amine, an alcohol, a thiol or a compound having one or two non-cumulated olefinic double bonds, and a process for the preparation of N-mono- or N,N-disubstituted ureas by reaction of ammonium isocyanates with a primary or secondary amine in a diluent.

    摘要翻译: 通过异氰酸和叔胺的加合物与伯胺和仲胺,醇,硫醇或具有一个或两个非累积烯烃的化合物的反应制备不对称取代的脲,氨基甲酸酯,硫代氨基甲酸酯或取代的异氰酸酯的方法 双键,以及通过异氰酸铵与稀释剂中的伯胺或仲胺反应来制备N-单或N,N-二取代的脲的方法。

    Process for preparing pure diacetonitrile
    10.
    发明授权
    Process for preparing pure diacetonitrile 失效
    纯二乙腈制备方法

    公开(公告)号:US4510099A

    公开(公告)日:1985-04-09

    申请号:US523623

    申请日:1983-08-15

    申请人: Gerhard Stern

    发明人: Gerhard Stern

    CPC分类号: C07C255/00

    摘要: Acetonitrile and molten sodium are reacted at a temperature of 96.degree.-140.degree. C. in the presence of an organic solvent which is inert to sodium, to give the sodium salt of diacetonitrile, the salt is hydrolyzed with water, the aqueous and the solvent phases are separated off, and very pure diacetonitrile crystallizes out in cold water.

    摘要翻译: 乙腈和熔融的钠在96°-140℃的温度下,在对钠惰性的有机溶剂的存在下反应,得到二乙腈的钠盐,该盐用水,水溶液和溶剂水解 分离相,非常纯的二乙腈在冷水中结晶出来。