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Note | Regular issue | Vol 53, No. 1, 2000, pp.183-190
Published online, 1st January, 1970
DOI: 10.3987/COM-99-8702
Sensitized Photoreduction of Nitrosoazoles on Titanium Dioxide

Andrea Pace, Silvestre Buscemi, Nicolò Vivona,* and Tullio Caronna

*Dipartimento di Chimica Organica “E. Paternò”, Università di Palermo , Viale delle Scienze-Parco D’Orleans II, 90128 Palermo, Italy

Abstract

The photosensitized reduction of some 4-nitrosopyrazoles and 4-nitrosoimidazoles using titanium dioxide as a photocatalyst has been investigated. The photoreaction produces the corresponding 4-aminoazoles and assumes an initial electron transfer from the conduction band of the excited titanium dioxide to the nitroso compound, followed by hydrogen transfer from the solvent. The photoreduction reaction takes also place by irradiating nitrosoazoles in the presence of triethylamine in acetonitrile, pointing out the electron transfer also to occur from a ground state donor to the excited nitrosoazole.