HETEROCYCLES

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact: purchase@heterocycles.com

Price: ¥ 4,400 (Yen only)
Period: This Article can be accessed for 7 days.

■ 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.