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A highly endothermic reduction of bis(2-dipyridyl)disulfide to 2-mercaptopyridine by H 2 O selectively proceeds using TiO 2 as a photocatalyst, being significantly enhanced upon incorporation of nanometer-sized Ag particles on TiO 2 .

TiO 2 photocatalytic 2e 2 -reduction of azobenzene to hydrazobenzene is found to occur at l ex > 300 nm while loading of nanometer-sized Pt particles on TiO 2 induces NNN bond cleavage via 4e 2 -reduction; only photoisomerization occurs in the absence of TiO 2 .

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Thionyl chloride was found to react with phenylethynyllithium and heteroaryllithium affording 1,4-diphenylbutadiyne and biheteroaryl, and the corresponding sulfoxides and sulfides, respectively. Apparently, ligand coupling proceeded within the intermediary sulfurane. The occurrence of ligand coupling was estimated from the pKa value of the carbon acid as a nucleophile. Furthermore, it was found that the presence of p-orbital, i.e., m-bond, is preferable at the ips0 carbon atom of the nucleophile for a good ligand coupling reaction, while for alkyllithiums and alkylmagnesium chloride do not give bialkyl as the main coupling product, but others, which are different from the organic lithium or magnesium chloride used.