Visible‐Light‐Induced Aerobic Oxidation of Alcohols in a Coupled Photocatalytic System of Dye‐Sensitized TiO₂ and TEMPO

Abstract

Like a differential gear: Upon irradiation with visible light, excited dye molecules inject electrons into TiO2 and form dye radicals, which can oxidize TEMPO to TEMPO+, which in turn oxidizes alcohols in the presence of O2 selectively to corresponding aldehydes. One reason for the selectivity is that the irradiation is downshifted to visible light.

WO3 Coupled P-TiO2 Photocatalysts with Mesoporous Structure

“…pairs, and the structure of catalysts. This can be achieved via the modification of semiconductors [6,7], addition of transition metals [8], nonmetal doping [9][10][11][12] as well as the use of coupled semiconductors.…”

Highly Efficient Aerobic Oxidative Hydroxylation of Arylboronic Acids: Photoredox Catalysis Using Visible Light

“…[10] Later, Zhao et al oxidized alcohols to aldehydes using visible light and dye-sensitized TiO 2 . [11] Recently, the groups of Blechert and Wang [12] developed a metal-free photooxidative system to achieve the oxidation of amines and alcohols, and Jiao et al described the use of a Ru II polypyridine complex and 4-methoxypyridine to promote the conversion of a-aryl halogen derivatives into a-aryl carbonyl compounds. [13] The molecular oxygen in air has been widely used as a green oxidant in synthesis.…”

Nitroxide: Anwendungen in der Synthese und in der Polymerchemie

“…[83] Kürzlich wurde eine interessante Methode zur Regenerierung von TEMPO + aus TEMPO veröffentlicht: [84] 3 . [86] Bislang haben wir uns auf die katalytische Verwendung von TEMPO und seinen Derivaten konzentriert; tatsächlich wurden fast alle Untersuchungen immer zumindest auch mit dem allgegenwärtigen TEMPO durchgeführt.…”