SYNTHESIS OF POLY(BIPHENYLENE KETONE)S VIA PALLADIUM-CATALYZED CROSS-COUPLING REACTIONS WITH KETONE DIACETALS

被引:31
作者
BOCHMANN, M
LU, JJ
机构
[1] School of Chemical Sciences, University of East Anglia, Norwich
关键词
AROMATIC POLYKETONE; PALLADIUM CATALYSIS; DIACETAL; CROSS-COUPLING CONDENSATION; ZINC REAGENT;
D O I
10.1002/pola.1994.080321311
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
Dibromobenzophenone diacetals (BrC6H4)(2)C (OR)(2) undergo cross-coupling reactions with (Bu(3)SnC(6)H(4))(2)O in the presence of palladium catalysts to give poly( diacetal ether)s whose molecular weights reflect the solubility changes of the growing polymer chains as a function of the diacetal precursors, R = Me < 1/2 CH2CH2 < 1/2 CH(2)CHMe and are significantly higher than those of polymers derived from dibromobenzophenone. New di-zinc reagents based on diacetal derivatives were synthesized and used as organometallic coupling reagents with a range of dibromoarenes, resulting in a series of previously inaccessible poly(biphenylene ketone)s and poly(biphenylene ketone sulfone)s. While poly(biphenylene ether ketone)s are insoluble, poly(biphenylene ketone)s readily dissolve in concentrated sulfuric acid. The effects of reaction parameters on the molecular weight of poly(biphenylene ketone) were determined. (C) 1994 John Wiley & Sons, Inc.
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页码:2493 / 2500
页数:8
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