B. Despax, J. Micheau, N. Paillous
1977
Citations
0
Influential Citations
3
Citations
Journal
Journal of Photochemistry
Abstract
Abstract The photoreduction of 3,3,5-trimethylcyclohexanone by 2-propanol was carried out at 313 nm with benzene as a cosolvent. The quantum yield of 3,3,5-trimethylcyclohexanol was measured systematically as a function of the concentration of the various reactants. The quantum yield increased with increasing initial ketone concentration; this effect could not be accounted for by classical mechanisms for photoreduction reactions. It could be shown that this phenomenon was caused neither by the occurrence of a radical propagation reaction, nor by a change in the terminating reactions resulting from the increase in the ketone concentration. A double photo-reduction process was then considered, the reducing agent being either 2-propanol or a ketone—alcohol complex. Computer calculation by an iterative method showed that this mechanism gave the best fit with the whole set of our experimental data. The rate constants of each elementary step were determined.