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Titania-Catalyzed H2O2 Thermal Oxidation of Styrenes to Aldehydes

1
Institute for Energy and Material/Food Resources, Technology Innovation Division, Panasonic Corporation, 3-4 Hikaridai, Seika-cho, Soraku-gun, Kyoto 619-0237, Japan
2
Interdisciplinary Research Center for Catalytic Chemistry, National Institute of Advanced Industrial Science and Technology (AIST), Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
*
Authors to whom correspondence should be addressed.
Academic Editor: Kei Saito
Molecules 2019, 24(14), 2520; https://doi.org/10.3390/molecules24142520
Received: 1 June 2019 / Revised: 3 July 2019 / Accepted: 9 July 2019 / Published: 10 July 2019
(This article belongs to the Special Issue Frontier in Green Chemistry Approaches II)
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Abstract

We investigated the selective oxidation of styrenes to benzaldehydes by using a non-irradiated TiO2–H2O2 catalytic system. The oxidation promotes multi-step reactions from styrenes, including the cleavage of a C=C double bond and the addition of an oxygen atom selectively and stepwise to provide the corresponding benzaldehydes in good yields (up to 72%). These reaction processes were spectroscopically shown by fluorescent measurements under the presence of competitive scavengers. The absence of the signal from OH radicals indicates the participation of other oxidants such as hydroperoxy radicals (•OOH) and superoxide radicals (•O2) into the selective oxidation from styrene to benzaldehyde. View Full-Text
Keywords: titanium dioxide; hydrogen peroxide; styrenes; benzaldehydes; non-irradiated oxidation; heterogeneous catalyst titanium dioxide; hydrogen peroxide; styrenes; benzaldehydes; non-irradiated oxidation; heterogeneous catalyst
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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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Ito, S.; Kon, Y.; Nakashima, T.; Hong, D.; Konno, H.; Ino, D.; Sato, K. Titania-Catalyzed H2O2 Thermal Oxidation of Styrenes to Aldehydes. Molecules 2019, 24, 2520.

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