Abstract

A photoelectrochemical approach to the alkylation of 1-alkylpyridinium ion is described. Photolysis of a suspension of Pt-coated TiO 2 (anatase) powder in an aqueous medium containing isobutyric acid and 1-ethylpyridinium perchlorate (pH 3–4) yielded 4-isopropyl-1-ethylpyridinium ion. Seventy percent of the isopropyl radicals generated at the TiO 2 anode sites by the photo-Kolbe process were found to have alkylated 1-ethylpyridinium ion, in the 4-position, with the remaining 30% being reduced to propane.

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