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Molecules 2015, 20(6), 9616-9639; doi:10.3390/molecules20069616

Xerogel-Sequestered Silanated Organochalcogenide Catalysts for Bromination with Hydrogen Peroxide and Sodium Bromide

Department of Chemistry, The State University of New York at Buffalo, Buffalo, NY 14260, USA
These authors contributed equally to this work.
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Author to whom correspondence should be addressed.
Academic Editor: Thomas G. Back
Received: 30 April 2015 / Accepted: 21 May 2015 / Published: 26 May 2015
(This article belongs to the Special Issue Selenium Catalysts and Antioxidants)
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Abstract

While H2O2 is a powerful oxidant, decomposing into environmentally benign H2O and O2, a catalyst is often required for reactions with H2O2 to proceed at synthetically useful rates. Organotellurium and organoselenium compounds catalyze the oxidation of halide salts to hypohalous acids using H2O2. When sequestered into xerogel monoliths, the xerogel-chalcogenide combinations have demonstrated increased catalytic activity relative to the organochalcogen compound alone in solution for the oxidation of halide salts to hypohalous acids with H2O2. Diorganotellurides, diorganoselenides, and diorganodiselenides bearing triethoxysilane functionalities were sequestered into xerogel monoliths and their catalytic activity and longevity were investigated. The longevity of the catalyst-xerogel combinations was examined by isolating and recycling the catalyst-xerogel combination. It was found tellurium-containing catalyst 3 and selenium-containing catalyst 8 maintained their catalytic activity through three recycling trials and adding electron-donating substituents to catalyst 3 also increased the catalytic rate. The presence of organotellurium and organoselenium groups in the +4 oxidation state was determined by X-ray photoelectron spectroscopy. View Full-Text
Keywords: organoselenides; organotellurides; diorgano diselenides; xerogel; catalytic bromination organoselenides; organotellurides; diorgano diselenides; xerogel; catalytic bromination
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Gatley, C.M.; Muller, L.M.; Lang, M.A.; Alberto, E.E.; Detty, M.R. Xerogel-Sequestered Silanated Organochalcogenide Catalysts for Bromination with Hydrogen Peroxide and Sodium Bromide. Molecules 2015, 20, 9616-9639.

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