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Temperature‐Dependent Immobilization of a Tungsten Peroxo Complex That Catalyzes the Hydroxymethoxylation of Olefins
Author(s) -
Chen Jizhong,
Hua Li,
Chen Chen,
Guo Li,
Zhang Ran,
Chen Angjun,
Xiu Yuhe,
Liu Xuerui,
Hou Zhenshan
Publication year - 2015
Publication title -
chempluschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.801
H-Index - 61
ISSN - 2192-6506
DOI - 10.1002/cplu.201402456
Subject(s) - catalysis , tungsten , imidazole , alkoxy group , chemistry , selectivity , ligand (biochemistry) , methanol , denticity , polymer chemistry , inorganic chemistry , combinatorial chemistry , organic chemistry , crystal structure , alkyl , biochemistry , receptor
A tungsten peroxo complex stabilized by the bidentate picolinato ligand has been synthesized and then immobilized successfully on imidazole‐functionalized silica. The immobilized tungsten‐based catalyst was employed as an efficient catalyst for the one‐pot synthesis of β‐alkoxy alcohols from olefins and methanol with H 2 O 2 . Regarding the catalyst evaluation and the results of characterization by the various methods, it was demonstrated that the immobilization of tungsten peroxo complex was highly temperature‐dependent. The tungsten peroxo complex can dissociate and diffuse into the liquid phase at reaction temperature, resulting in a homogeneous reaction. Nevertheless, the catalytically active species was anchored on the imidazole‐functionalized silica by hydrogen bonding as the temperature was lowered to 0 °C after the reaction, which thus offered a highly effective approach for recycling the catalyst for consecutive cycles. In addition, various olefins can be converted to the corresponding β‐alkoxy alcohols with good conversion and selectivity under relative mild conditions by H 2 O 2 .