Photocyclization of 1,2-diaryl- and photobicyclization of 1,2,6-triarylpyridinium cations

Autor:	Ya. R. Tymyanskii, E. Lunt, Bushra J. Agha, M. I. Knyazhanskii, A. I. Pyshchev, Alan R. Katritzky, G. Z. de Ville
Rok vydání:	1984
Předmět:	Steric effects chemistry.chemical_compound chemistry Excited state Intramolecular force Organic Chemistry Electronic effect Quantum yield Dehydrogenation Pyridinium Singlet state Photochemistry
Zdroj:	Chemistry of Heterocyclic Compounds. 20:1245-1254
ISSN:	1573-8353 0009-3122
DOI:	10.1007/bf00505716
Popis:	New 1,2-diaryl- and 1,2,6-triarylpyridinium salts, containing various five- and six-membered heteroaromatic substituents in the 1, 2, and 6-positions of the pyridinium ring, were synthesized. New tetra- and hexacyclic compounds were prepared by photocyclization of the cations of these salts. Photocyclization proceeds through a singlet excited state with nonadiabatic formation of a dihydro intermediate, followed by its oxidative dehydrogenation. The structure and quantum yield of the formation of photoproducts are determined by steric and electronic effects of the substituents, and in bichromophore compounds by the presence of S-S intramolecular interfragment energy transfer.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::28af3274266cb26af5317b82d4d76f86 https://doi.org/10.1007/bf00505716 Zobrazit plný text záznamu Full text from SpringerLink