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Geometrical isomerism and photochemical behaviour of α‐substituted 2 and 4‐styrylpyridines
Author(s) -
Galiazzo G.,
Bortolus P.,
Cauzzo G.,
Mazzucato U.
Publication year - 1969
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570060404
Subject(s) - chemistry , photoisomerization , phenanthrenes , photochemistry , irradiation , absorption (acoustics) , absorption spectroscopy , spectral properties , spectral line , kinetic energy , computational chemistry , organic chemistry , isomerization , phenanthrene , catalysis , physics , quantum mechanics , astronomy , nuclear physics , acoustics
α‐Methyl and α‐phenyl substituted 2 and 4‐styrylpyridines were prepared by classical routes. The geometrical isomers were separated and characterized on the basis of their U.V. absorption spectra and/or of their behaviour under U.V. irradiation which led to photoisomerization and photocyclization products. The last photoreaction, in the case of α‐phenyl derivatives, gave pyridyl‐substituted phenanthrenes and phenyl‐substituted azaphenanthrenes which were isolated and characterized. Spectral, chromatographic and physical properties of trans and cis derivatives and related photocyclization products are given as well as some kinetic data for the photochemical reactions.