Oxidation of 6- and 8-methylquinolines upon UV-illumination in the presence of a powder of TiO2 photocatalyst.

Abstract

Selective transformation of the methyl group into a formyl group in methylquinolines is of great interest because formation of the corresponding aldehydes is either very expensive or unknown. We report here results concerning the photo-oxidation of 6- and 8-methylquinolines (6-MQ and 8-MQ) suspended with TiO2 powder in oxygenated acetonitrile. The analytical study of the products generated from the TiO2-photoassisted oxidation of 6-MQ and 8-MQ in oxygenated acetonitrile suspensions indicated that in both cases, for a UV-illumination period of < 24 h, the corresponding formyl derivatives quinoline-6- and -8-carbaldehydes are detected as practically the sole products. Analysis of further photogenerated oxidation products enabled mechanistic delineation of the course of the semiconductor-mediated reaction.

Cite this paper

@article{Navo2002OxidationO6, title={Oxidation of 6- and 8-methylquinolines upon UV-illumination in the presence of a powder of TiO2 photocatalyst.}, author={Jos{\'e} Antonio Nav{\'i}o and Miguel Garc{\'i}a-G{\'o}mez and M Angeles Pradera and Jos{\'e} Luis Mart{\'i}nez Fuentes}, journal={Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology}, year={2002}, volume={1 2}, pages={133-5} }