Photoinduced Carbonyl Coupling of Aldehydes on Anatase TiO2(101)

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• 作者：Zhenhua Geng ; Xiao Chen ; Wenshao Yang ; Qing Guo ; Dongxu Dai ; Xueming Yang
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：May 12, 2016
• 年：2016
• 卷：120
• 期：18
• 页码：9897-9903
• 全文大小：537K
• 年卷期：0
• ISSN：1932-7455

文摘

Carbonyl coupling of aldehydes is critical to many synthetic processes, including the development of alternative fuels and useful synthetic chemicals. We report a general photoinduced process for carbonyl coupling of aldehydes as a route to ketone synthesis. In contrast to thermal carbonyl coupling of aldehydes with O₂ to ketones via carboxylate-type intermediates at high temperature, carbonyl coupling of aldehydes (CH₃CHO, CH₃CH₂CHO, PhCHO) to produce ketones on anatase–TiO₂(101) can be promoted by UV light below room temperature with high efficiency on the Ti_5c sites, while aldehydes can also be decomposed during UV light irradiation. The mechanistic model constructed in this study elucidates the crucial role of TiO₂ as a photocatalyst for synthetic reactions and provides a new pathway in conversion of aldehydes to ketones.