Single and Double Suzuki−Miyaura Couplings with Symmetric Dihalobenzenes
作者:David J. Sinclair、Michael S. Sherburn
DOI:10.1021/jo050105q
日期:2005.4.1
m- or p-diiodobenzene undergoes selective double coupling reactions with arylboronic acids and esters. Selectivity for double coupling over single coupling is remarkably strong: even with a diiodobenzene:monoboronic acid ratio of 10:1, the products of double coupling are formed in good yields. Steric hindrance and electronic influences of the boronic acid or ester, and reaction conditions do not appear to impact significantly upon the outcome of the reaction. In contrast, m- and p-dibromobenzenes undergo single couplings with aryl boronic acids with high selectivity.
Non-linear high Tg polyimide-based membranes for separating CO2/CH4 gas mixtures
作者:Zeljka P. Madzarevic、Beatriz Seoane、Jorge Gascon、Maruti Hegde、Theo J. Dingemans