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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/25223
Title: Polymer-anchored oxoperoxo complexes of vanadium(V), molybdenum(VI) and tungsten(VI) as catalyst for the oxidation of phenol and styrene using hydrogen peroxide as oxidant
Authors: Maurya, Mannar Ram
Kumar M.
Sikarwar S.
Published in: Reactive and Functional Polymers
Abstract: 2-(2-pyridyl)benzimidazole (2-pybmz) and 2-(3-pyridyl)benzimidazole (3-pybmz) have been covalently anchored to chloromethylated polystyrene crossed-linked with 5% divinylbenzene in DMF in presence of triethylamine in ethylacetate. These chelating resins readily react with non-isolable metal peroxo species, prepared in situ by stirring V2O5 (in presence of aqueous KOH), MoO3 or WO3 · H2O with an excess of 30% H2O2, to give the corresponding oxodiperoxo complexes, PS-K[VO(O2)2(L)] (L = 2-pybmz: 1, L = 3-pybmz: 4), PS-[MoO(O2)2(L)] (L = 2-pybmz: 2, L = 3-pybmz: 5) and PS-[WO(O2)2(L)] (L = 2-pybmz: 3, L = 3-pybmz: 6). PS-2-pybmz and PS-3-pybmz represent polymer-anchored ligands. Structures of these complexes have been established on the basis of spectroscopic (IR and electronic), thermogravimetric studies and elemental analyses. Oxidation of phenol or styrene with selected catalysts was tested using H2O2 as an oxidant. Oxidation of phenol with ca. 35% conversion gave a mixture of catechol and p-hydroquinone where selectivity towards catechol is ca. 62%. Oxidation of styrene gave five products, styrene epoxide, benzaldehyde, benzoic acid, phenylacetaldehyde and 1-phenylethane-1,2-diol. Various parameters such as amount of oxidant and catalyst, and temperature of the reaction mixture have been taken into consideration for the maximum conversion of substrates. These catalysts are recyclable without considerable loss in their catalytic activities. IR spectral data of both freshly prepared and recovered catalysts are also identical, which indicate that the metal complex moiety is intact during the catalytic reaction. © 2005 Elsevier B.V. All rights reserved.
Citation: Reactive and Functional Polymers, 66(8): 808-818
URI: https://doi.org/10.1016/j.reactfunctpolym.2005.11.007
http://repository.iitr.ac.in/handle/123456789/25223
Issue Date: 2006
Keywords: 2-(2-Pyridyl)benzimidazole
2-(3-Pyridyl)benzimidazole
Oxidation of phenol
Oxidation of styrene
Polymer-anchored complexes
ISSN: 13815148
Author Scopus IDs: 7005255411
57211647626
8641874100
Author Affiliations: Maurya, M.R., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Kumar, M., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Sikarwar, S., Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India
Funding Details: Council of Scientific and Industrial Research, New Delhi [Grant No. 01(1826)/02/EMR-II] is gratefully acknowledged for financial support of the work. Authors are also thankful to Thermax Ltd., Pune, India for providing chloromethylated polystyrene. Council of Scientific and Industrial Research, India, CSIR: 01(1826)/02/EMR-II
Corresponding Author: Maurya, M.R.; Department of Chemistry, , Roorkee, 247 667, India; email: rkmanfcy@iitr.ernet.in
Appears in Collections:Journal Publications [CY]

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