申请人:RAYCHEM LIMITED
公开号:EP0262920A2
公开(公告)日:1988-04-06
Friedel Crafts preparation of arylene ether (especially arylene ether ketone) oligomers with an exceptionally high degree of isomeric purity and freedom from by-products can be achieved by adding to the Lewis acid reaction system a protic controlling agent selected from ROX, water, RCOOX, RSO₃X, and ROY, wherein R is organic, X is hydrogen or metal, and Y is metal.
Contrary to conventional expectation, the protic agent does not significantly acylate or alkylate the Friedel Crafts reaction product, and controlling agents of relatively low molecular weight, e.g., benzoic acid, can surprisingly be selected to produce dispersions of the resulting oligomers.
在路易斯酸反应体系中加入选自 ROX、水、RCOOX、RSO₃X 和 ROY(其中 R 为有机物,X 为氢或金属,Y 为金属)的原质控剂,可实现 Friedel Crafts 芳基醚(尤其是芳基醚酮)低聚物的制备,该低聚物具有极高的同分异构纯度且无副产物。
与传统预期不同的是,质子剂不会使 Friedel Crafts 反应产物发生明显的酰化或烷基化,而且可以选择分子量相对较低的控制剂,如苯甲酸,来生产所得低聚物的分散体。