Transesterification of carboxylic or carbonic esters
    86.
    发明授权
    Transesterification of carboxylic or carbonic esters 失效
    羧酸或碳酸酯的酯交换

    公开(公告)号:US4681967A

    公开(公告)日:1987-07-21

    申请号:US768960

    申请日:1985-08-23

    申请人: Michael J. Green

    发明人: Michael J. Green

    IPC分类号: B01J31/02 C07C68/06 C07C67/02

    摘要: A process for the transesterification of a carboxylic or carbonic acid ester comprises reacting the carboxylic or carbonic acid ester under transesterification conditions with an alcohol in the presence, as catalyst, of either (i) a Group V element-containing Lewis base and an epoxide or (ii) a cyclic amidine.The Lewis base can be an organic compound containing trivalent phosphorus or nitrogen and can be an amine, for example an amidine.The process can be operated in the liquid phase at a temperature of from 15.degree. to 150.degree. C., and the catalyst is employed in solution.Preferred catalysts are those where the cyclic amidine forms part of a fused ring system containing six and five membered rings, six and seven membered rings or two six membered rings.

    Transesterification process
    87.
    发明授权
    Transesterification process 失效
    酯交换过程

    公开(公告)号:US4663472A

    公开(公告)日:1987-05-05

    申请号:US696320

    申请日:1985-01-30

    申请人: Michael J. Green

    发明人: Michael J. Green

    CPC分类号: C08G71/04

    摘要: A process for the transesterification of urethanes comprises reacting a urethane with an alcohol at elevated temperature in the presence of a Lewis base containing catalyst.The process is particularly useful when the alcohol used is a polyol since the product of the transesterification is a polyurethane. Since urethanes can be generated from amines and organic carbonates using the methods of the prior art, the present invention provides processes for the manufacture of polyurethanes from amines which avoid the use of either phosgene or isocyanates both of which are extremely toxic.

    摘要翻译: 氨基甲酸酯的酯交换的方法包括在含有路易斯碱的催化剂存在下,在升高的温度下使氨基甲酸酯与醇反应。 当所用的醇是多元醇时,该方法特别有用,因为酯交换的产物是聚氨酯。 由于可以使用现有技术的方法由胺和有机碳酸酯生成氨基甲酸酯,本发明提供从胺制造聚氨酯的方法,其避免使用两者都极度有毒的光气或异氰酸酯。