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Lacunary Keggin polyoxotungstate as reaction‐controlled phase‐transfer catalyst for catalytic epoxidation of olefins
Author(s) -
Li MingQiang,
Jian XiGao,
Yang YongQiang
Publication year - 2004
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.20040220823
Subject(s) - lacunary function , catalysis , chemistry , selectivity , phase (matter) , polyoxometalate , homogeneous , keggin structure , inorganic chemistry , photochemistry , organic chemistry , physics , mathematics , pure mathematics , thermodynamics
A new reaction‐controlled phase‐transfer catalyst system, lacunary Keggin polyoxotungstate [C 7 H 7 N(CH 3 ) 3 ] 9 PW 9 O 34 has been synthesized and used for catalytic epoxidation of olefins with H 2 O 2 as the oxidant. Infrared spectra were used to analyze the behavior of the phase transfer of catalyst. In this system, the catalyst not only can act as homogeneous catalyst but also as heterogeneous catalyst to be easily filtered and reused. The epoxidation reaction is clean and exhibits high conversion and selectivity as well as excellent catalyst stability.