Visible light-initiated aerobic oxidation of amines to imines over TiO₂ microspheres with TEMPO⁺PF₆⁻

Abstract

Semiconductor photocatalysis holds prodigious promise to drive vital chemical reactions utilizing sunlight. Amongst semiconductors, developing TiO2-related materials is one of the most viable pathways for enhanced photocatalytic performances because of...

Unprecedented Selective Synthesis of Imines by Photocatalytic Oxidative Coupling of Primary Amines under N2O Atmosphere**

“…[10] Other pathways for one-pot synthesis of imines have largely been developed through oxidation reactions under oxygen atmosphere, so as to reduce energy consumption and waste emission, [10] like self-coupling of primary amines [11,[13][14][15] or cross-coupling of alcohols with amines. [16][17][18] More recently, photocatalytic alternative processes have been described with TiO 2 , [19][20][21] carbon nitride based catalysts, [22,23] Ru on polyoxometalate, [24] porphyrinic covalent organic framework, [25] or a mixed-phase MoS 2 [26] as photocatalysts, under air or oxygen atmosphere. Controlling the selectivity remains a crucial challenge for such photocatalytic reactions to avoid usual over-oxidation of the organic compounds and even mineralization into carbon dioxide.…”