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Herein, we present a novel method for the synthesis of gem-difluoroalkenes via visible-light photoredox-catalyzed defluoroaryloxymethylation of α-trifluoromethyl alkenes using α-silyl ethers as aryloxymethyl radical precursors. This reaction shows good functional group tolerance and provides the desired products in good to excellent yields. Based on mechanistic studies, we propose a reaction mechanism involving single-electron oxidation of an α-silyl ether to generate an α-aryloxymethyl radical.

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Modification of boron-doped diamond (BDD) electrodes with bimetallic platinum-iridium was studied. Combination techniques of wet chemical seeding and electrochemical deposition were performed with various Pt-Ir precursor ratios of (1:1), (1:2) and (2:1). These electrodes were then applied for electrochemical reduction of CO2 dissolved in 0.1 M NaCl solution at the potentials of -1.1 V, -1.2 V, -1.3 V, and -1.5 V (vs Ag/AgCl) for 60 min. Electroreduction of CO2 applied at PtIr(2:1)-BDD at the potential of -1.1 V (vs Ag/AgCl) produced formic acid, methanol and hydrogen as the main products.

We developed a photocatalyzed Giese reaction of various weakly activated Michael acceptors with a neutral siliconbased radical precursor and applied it at large-scale using a continuous flow reactor. The developed method successfully overcomes the substrate scope limitations of previous studies, shows good functional groups tolerance, and affords good to excellent yields. On the basis of mechanistic studies, we propose a reaction mechanism that involves an in situ generated alkoxymethyl radical via single-electron oxidation of α-trimethylsilyl-substituted ethers.