研究目的
Investigating the effect of electron-donating and electron-withdrawing substituents on the TiO2 photocatalytic oxidation of trans-stilbenes.
研究成果
The photocatalytic oxidation of trans-stilbenes on TiO2 is influenced by the electronic nature of substituents, with electron-donating groups accelerating and electron-withdrawing groups decelerating the reaction. The mechanism likely involves surface hydroperoxo or hydroperoxy species rather than free OH radicals, suggesting a pathway similar to Prilezhaev epoxidation.
研究不足
The study focused on the initial stages of the photocatalytic reactions, and the potential formation of benzoic acids from prolonged reactions was not extensively explored. The mechanism involving hydroperoxo or hydroperoxy species requires further confirmation.
1：Experimental Design and Method Selection
The study involved photocatalytic reactions of trans-stilbene and its derivatives on TiO2 particles under UV irradiation, focusing on the effect of substituents on the reaction rate and product selectivity.
2：Sample Selection and Data Sources
Trans-stilbene and its mono- and di-substituted derivatives were synthesized or purchased. Reactions were carried out in acetonitrile-water mixed solvent under oxygen atmosphere.
3：List of Experimental Equipment and Materials
TiO2 powder (P25, Nippon Aerosil Co., Ltd.), Pyrex-glass test tube, 500 W super-high-pressure mercury lamp, UV35 glass filter (Hoya Corporation), HPLC (HITACHI L-6000 series).
4：Experimental Procedures and Operational Workflow
Reactions were conducted in a Pyrex-glass test tube with magnetic stirring and oxygen bubbling. Samples were periodically taken for HPLC analysis to monitor the reaction progress.
5：Data Analysis Methods
HPLC analysis was used to quantify the products. NMR spectroscopy was employed for structural characterization of synthesized compounds.
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