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    • 90. 发明授权
    • Transesterification of esters
    • 酯的酯交换反应
    • US4559180A
    • 1985-12-17
    • US551863
    • 1983-11-15
    • Michael J. Green
    • Michael J. Green
    • B01J31/02C07C68/06C07C67/02C07C67/03C07C68/00
    • C07C68/065B01J31/0237B01J31/0247B01J31/0251B01J31/0267B01J2231/40B01J2231/49
    • 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.
    • 羧酸或碳酸酯的酯交换反应的方法包括在酯交换反应条件下,在(i)含有V族元素的路易斯碱和环氧化物的催化剂存在下,使羧酸或碳酸酯与醇反应,或 (ii)环状脒。 路易斯碱可以是含有三价磷或氮的有机化合物,并且可以是胺,例如脒。 该方法可以在液相中在15至150℃的温度下操作,催化剂用于溶液中。 优选的催化剂是其中环状脒形成包含六元和五元环,六元和七元环或六元环的稠环体系的一部分的催化剂。