Journal
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
Volume 368, Issue -, Pages 152-158Publisher
ELSEVIER
DOI: 10.1016/j.molcata.2012.11.022
Keywords
Polyoxometalates; Toluene; Benzylic C-H bonds; Benzaldehyde; Oxidation
Categories
Funding
- National Natural Science Foundation of China [21172098, 21173105]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1138]
- National fundamental scientific talented person training fund-the ability to improve project [J1103307]
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A novel homogeneous vanadium-substituted polyoxometalate catalyst of [n-Bu4N](3)H-3[PW9V3O40] showed good catalytic activity for the activation of C-H bonds of toluene and substituted toluene with TBHP (70% aq) under solvent-free conditions. Under the optimal conditions, a 65% yield of benzaldehyde and a TON of 5221 were obtained over this catalyst at 343 K. This catalyst also showed good conversion and selectivity for the oxidation of a series of substituted toluene. The vanadium-substituted Keggin-POM was not decomposed to some species upon the treatment of 530-fold of TBHP by IR characterization. A free radical mechanism was proposed based on the experimental results and the literature supports. (C) 2012 Elsevier B.V. All rights reserved.
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