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Difluoroalkyl Thiocyanidation of Alkenes Via Blue LED Light–Induced Intermolecular Three-Component Coupling Reaction Catalyzed by Copper Nanoparticle-Loaded Kaolin
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DOI：10.1002/ajoc.70472.png)
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Abstract
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In this study, the catalyst Cu/NH2-Ph@CK was produced by modifying coal-bearing kaolin (CK) with a silane coupling agent, followed by impregnation with copper chloride, and NaBH4 reduction. The catalyst structure was characterized via x-ray diffraction, x-ray photoelectron spectroscopy, inductively coupled plasma mass spectrometry, transmission electron microscopy, and N2 adsorption–desorption experiments. The Cu nanoparticle (CuNP) content of Cu/NH2-Ph@CK was 2.7 wt.%, and the average particle size of the CuNPs was approximately 6.6 nm. Catalytic experiments revealed that Cu/NH2-Ph@CK exhibited high catalytic activity for the blue LED light-induced three-component coupling reaction with styrene, ethyl bromodifluoroacetate, and sodium thiocyanate. In addition, the catalyst could accommodate a wide range of substrates, achieving above moderate yields. Moreover, the catalyst could be recycled five times while maintaining good catalytic activity. This study proposes a simple and efficient method for synthesizing catalysts for three-component coupling reactions.
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