Solvent-free selective oxidation of C-H bonds of toluene and substituted toluene to aldehydes by vanadium-substituted polyoxometalate catalyst

被引：43
作者：
Ma, Baochun [1 ]
Zhang, Zhenxin [1 ]
Song, Wenfeng [1 ]
Xue, Xiaoling [1 ]
Yu, Yongze [1 ]
Zhao, Zhensheng [1 ]
Ding, Yong [1 ]
机构：
[1] Lanzhou Univ, State Key Lab Appl Organ Chem, Coll Chem & Chem Engn, Lanzhou 730000, Peoples R China
来源：
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL | 2013年 / 368卷
基金：
中国国家自然科学基金;
关键词：
Polyoxometalates; Toluene; Benzylic C-H bonds; Benzaldehyde; Oxidation; HYDROGEN-PEROXIDE OXIDATION; LIQUID-PHASE OXIDATION; TERT-BUTYLHYDROPEROXIDE; NMR CHARACTERIZATION; 2-DIMENSIONAL W-183; EPOXIDATION; ALKENES; OLEFINS; ALKANES; ALCOHOLS;
D O I：
10.1016/j.molcata.2012.11.022
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
引用
收藏
页码：152 / 158
页数：7
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