Premium
A Novel and Efficient Process for Preparation of 2,4‐Diphenyl‐4‐methyl‐1‐pentene in Brönsted Acidic Ionic Liquid [Hmim] + B ${\rm F}^{-}_{4} $
Author(s) -
PengRong Zhang,
JiYan Du,
Fan Yang,
Gang Zou,
Jie Tang
Publication year - 2005
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.200590581
Subject(s) - chemistry , ionic liquid , catalysis , selectivity , olefin fiber , yield (engineering) , solvent , dimer , medicinal chemistry , organic chemistry , inorganic chemistry , materials science , metallurgy
Highly selective dimerization of α‐methylstyrene (AMS) was effected using a Brönsted acidic ionic liquid, [Hmim] + B ${\rm F}^{-}_{4} $ , as solvent as well as catalyst, providing the industrial high‐value olefin, 2,4‐diphenyl‐4‐methyl‐1‐pentene (1‐PT). The desired dimer 1‐PT could be obtained in 90% yield at 96% conversion in the dimerization of AMS under optimized conditions. Features of the procedure include use of readily available ionic liquid‐catalyst, exclusion of volatile organic solvents, higher selectivity and efficiency for 1‐PT.