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Heteropolyanion‐Based Ionic Liquids: Reaction‐Induced Self‐Separation Catalysts for Esterification
Author(s) -
Leng Yan,
Wang Jun,
Zhu Dunru,
Ren Xiaoqian,
Ge Hanqing,
Shen Lei
Publication year - 2008
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200803567
Subject(s) - catalysis , ionic liquid , homogeneous , solubility , citric acid , chemistry , melting point , reuse , precipitation , homogeneous catalysis , organic chemistry , chemical engineering , combinatorial chemistry , thermodynamics , physics , ecology , biology , meteorology , engineering
It comes out in the wash : In the esterification of citric acid with n ‐butanol, heteropolyanion‐based ionic liquid (IL) catalysts show high catalytic activity, self‐separation, and easy reuse. The good solubility in reactants, nonmiscibility with ester product, and high melting point of the IL catalysts enable the reaction‐induced switching from homogeneous (b in the picture) to heterogeneous (c) with subsequent precipitation of the catalyst (d).