A Study of the Aryl–Aryl Coupling Reactions of (4‐X‐C<sub>6</sub>H<sub>4</sub>)Ph<sub>2</sub>P˭O
作者:Michaela Czupik、Nathaniel Bankey、Eric Fossum
DOI:10.1081/scc-120027718
日期:2004.12.31
The Suzuki coupling reactions of (4-X-Ph)Ph2P=O, where X = bromide or triflate, with a series of boronic acids were studied using tetrakis-(triphenylphosphino) palladium or palladium acetate as the catalyst. The boronic acids utilized were phenyl, p-tolyl, 3-methoxy, 4-methoxy, and 4-acetyl. Yields of the corresponding biphenyl analogues ranged from 50 to 95%. Palladium acetate provided products free of triphenylphosphine contamination, and required significantly shorter reaction times for complete reaction (2 to 4 hours vs. 12 to 24 hours, respectively) than when tetrakis-(triphenylphosphino) palladium was used. The methodology was applied to bis(4-F-Ph)(4-OTf-Ph)P=O to afford, in excellent yield (99%), a biphenyl-based AB, monomer precursor for dendritic and hyperbranched poly(arylene ether phosphine oxide)s.