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PHOTOCHEMISTRY OF MACROCYCLIC KETONES WITHIN ZEOLITES - COMPETITION BETWEEN NORRISH TYPE-I AND TYPE-II REACTIVITY

TitlePHOTOCHEMISTRY OF MACROCYCLIC KETONES WITHIN ZEOLITES - COMPETITION BETWEEN NORRISH TYPE-I AND TYPE-II REACTIVITY
Publication TypeJournal Article
Year of Publication1991
AuthorsRamamurthy, V, Lei, XG, Turro, NJ, Lewis, TJ, Scheffer, JR
JournalTetrahedron Letters
Volume32
Pagination7675-7678
Date PublishedDec
Type of ArticleArticle
ISBN Number0040-4039
KeywordsALKANONES, ALKYL, ALPHA-CLEAVAGE, DIBENZYL KETONES, FAUJASITES, KETONES, photolysis, TEMPERATURE-DEPENDENCE
Abstract

Photolysis of macrocyclic mono- and diketones (1 and 2) included in X and Y zeolites gives Norrish type I products in addition to the products obtained via the Norrish type II process, the only observed process in isotropic media. Enhancement of the type I over the type II process is cation-dependent and especially large enhancements are obtained with Li and Na as cations. The zeolite effect is attributed to a reduction in the rate of the Norrish type II gamma-hydrogen abstraction process.

URL<Go to ISI>://A1991GX96200012