Diphenylmethane-Mediated Transmethylation of Methylbenzenes over H-Zeolites

Despite their vital roles in the catalytic cycle for toluene disproportionation, diphenylmethane (DPM)-type compounds have never been directly detected or proved to be true reaction intermediates from experimental techniques. In this report, we provide unprecedented insights into the DPM-mediated re...

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Bibliographic Details
Published in:Journal of the American Chemical Society 2006-05, Vol.128 (17), p.5618-5619
Main Authors: Svelle, Stian, Olsbye, Unni, Lillerud, Karl-Petter, Kolboe, Stein, Bjørgen, Morten
Format: Article
Language:English
Subjects:
Catalysis
Catalytic reactions
Chemistry
Exact sciences and technology
General and physical chemistry
Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry
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Summary:Despite their vital roles in the catalytic cycle for toluene disproportionation, diphenylmethane (DPM)-type compounds have never been directly detected or proved to be true reaction intermediates from experimental techniques. In this report, we provide unprecedented insights into the DPM-mediated reaction mechanism, by demonstrating the build-up of DPM species inside the zeolite pores and following their decomposition. It can be stated that, despite their bulkiness, (di)methylated DPM species may indeed be formed at high concentrations in the ZSM-5 channels when toluene is reacted. The dimethyl−DPM species are unstable when present in the zeolite voids and decompose under a concomitant evolution of xylene at 200 °C.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja060931w