Substituted polyaryls were synthesized successfully via sterically hindered double Suzuki cross-couplings of arylboronic acids with aryl dibromides in the presence of Pd（PPh3）4 and KOtBu within a very short time. ？2009 Guo Hua Gao. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Zhan Zhang Hai Ying Ji Xian Lei Fu Yu Yang Yun Rong Xue Guo Hua Gao
Michael addition of active methylene compounds to α,β-unsaturated carboxylic esters and nitriles was effectively catalyzed by a basic ionic liquid, 1-butyl-3-methylimidazolium acetate（[Bmim]OAc）. The his-addition products were selectively obtained in high yields under mild reaction conditions.
YANG Yu WANG Li-bing ZHANG Zhan LI Cai-meng FU Xian-lei GAO Guo-hua
A series of novel imidazolium based ionic liquids containing the urea moiety were designed and synthesized for anion recognition. 1-Ethylurea-3-methylimidazolium acetate ([Eumim]OAc) was used as the receptor for the halides and complex anions (BF4-, PF6-, BPh4-). 1H NMR spectra showed that the urea protons and imidazolium C(2) proton of the receptor ([Eumim]OAc) moved upfield on addition of various anions. A Job plot showed that the [Eumim]OAc receptor formed a 1:1 complex with BPh4-. X-ray diffraction analysis and the molecular modeling study revealed that the conformations of [Eumim]OAc and [Eumim]BPh4 were different. The conformational change of the cation was caused by anion exchange, and may provide an alternative to current methods for recognition of anions.
