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Date of Publication:2021-01-01

Journal:Jingxi Huagong/Fine Chemicals

Volume:38

Issue:8

Page Number:1635-1643

ISSN No.:1003-5214

Abstract:Metal organic framework Mg-TCA was constructed by hydrothermal self-assembly between Lewis acidic Mg2+ and photosensitive tricarboxytriphenyl amine (H3TCA). SC-XRD was used to determine the crystal structure of Mg-TCA. CV, UV-Vis and FL measurements indicated that Mg-TCA had a good absorption ability in visible light region and its photoexcited redox potential was -1.95 V (vs. SCE). Mg-TCA could effectively allow access to a wide range of α-alkyl-acetophenones (30%~82%) under the synergistic Lewis acid and photoredox catalysis, and the reaction conditions was obtained as follows: styrene compounds (0.2 mmol), N-hydroxyphthalimide (NHPI) ester (0.3 mmol), Mg-TCA (0.01 mmol), DMSO (2 mL), irradiation under 405 nm LED for 24 h at N2 atmosphere. The catalyst could be reused for two times without deactivation, and its structure remained intact before and after use. Mechanism studies revealed that a synergistic Lewis acid and photoredox catalysis process was carried out within this transformation, the Lewis acidic nodes of Mg-TCA binded and absorbed NHPI ester, putting the NHPI ester approximate to the photoredox catalytic center within Mg-TCA, thus improving the catalytic efficiency. © 2021, Editorial Office of FINE CHEMICALS. All right reserved.

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