Photoelectrochemical oxidation halide salts

Semiconductor-mediated photoelectrochemical oxidation of halide salts provides a procedure for the halogenation of alkenes via excitated halide species. For example, bromination of cyclohexene has been performed in a Ti02/Bu4NBr (or PhaPMeBr) /O2 system. The reactive bromine species probably arise from a one-electron oxidation of adsorbed bromide ions on the semiconductor by photoin ation, which produces surface-bound bromine atoms (equation 40). 

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