Oxidovanadium(V) Complexes Anchored on Carbon Materials as Catalysts for the Oxidation of 1-Phenylethanol
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- 作者：Dr. Manas Sutradhar ; Dr. Luí ; sa M. D. R. S. Martins ; Dr. Só ; nia A. C. Carabineiro ; Dr. M. Fá ; tima C. Guedes da Silva ; Dr. Josephus G. Buijnsters ; Prof. José ; L. Figueiredo and Prof. Armando J. L. Pombeiro
- 刊名：ChemCatChem
- 出版年：2016
- 出版时间：July 6, 2016
- 年：2016
- 卷：8
- 期：13
- 页码：2254-2266
- 全文大小：2085K
- ISSN：1867-3899
文摘
Six oxidovanadium(V) aroylhydrazone complexes derived from (3,5-di-tert-butyl-2-hydroxybenzylidene)-2-hydroxybenzohydrazide (H<sub>2sub>L<sup>1sup>) and (3,5-di-tert-butyl-2-hydroxybenzylidene)-2-aminobenzohydrazide (H<sub>2sub>L<sup>2sup>), namely, [VOL<sup>1sup>(OEt)][VOL<sup>1sup>(OEt) (EtOH)] (1), [VOL<sup>2sup>(OEt)] (2), [Et<sub>3sub>NH][VO<sub>2sub>L<sup>1sup>] (3), [VO<sub>2sub>(HL<sup>2sup>)]⋅2 EtOH (4), [(VOL<sup>1sup>)<sub>2sub>(μ-O)] (5), and [(VOL<sup>2sup>)<sub>2sub>(μ-O)] (6), were synthesized and characterized by elemental analysis, IR, <sup>1sup>H NMR, and <sup>51sup>V NMR spectroscopies, ESI-MS and, for 1–5, single-crystal XRD. The compounds have VO<sup>3+sup> (1 and 2), VO<sub>2sub><sup>+sup> (3 and 4), and V<sub>2sub>O<sub>3sub><sup>4+sup> (5 and 6) cores. They are active homogeneous catalysts in the microwave-assisted, solvent-free peroxidative oxidation of 1-phenylethanol to acetophenone by tBuOOH. The immobilization of the oxidovanadium complexes (1, 2, 4, and 5) on oxidized carbon materials improved the oxidation efficiency and allowed catalyst reuse with the preservation of activity.