α-Alkyldibenzylketones included in cation exchanged faujasite type zeolites show photobehavior different from that in isotropic organic solvents. Rearrangement and disproportionation which do not contribute in solution are the major processes within the cavities of faujasites. Cation size plays a major role in controlling the pathway pursued by the primary and the secondary radical pair.
Modification of photochemical reactivity by zeolites. A comparison between zeolite-solvent slurry and dry solid photolyses
作者:V. Ramamurthy、D. R. Corbin、N. J. Turro、Z. Zhang、M. A. Garcia Garibay
DOI:10.1021/jo00001a048
日期:1991.1
The use of a zeolite-solvent slurry as a convenient medium to carry out photoreactions is illustrated with four examples, namely Norrish type I reaction of dibenzyl ketones, Norrish type I and type II reactions of alpha-alkylbenzyl benzyl ketones, Norrish type II reaction of aryl alkyl ketones, and photodimerization of acenaphthylene. Solvent present within the supercages of zeolites X and Y provides constraint on the mobility of the included guest molecules. Such restrictions are reflected in the product distributions. The difference in the product distribution obtained between the zeolite-solvent slurry and a homogeneous solution is often higher than that between the dry powder zeolites and a homogeneous solution.
Modification of photochemical reactivity by zeolites. Norrish type I and type II reactions of ketones as photochemical probes of the interior of zeolites