Z/E, photoisomerization of 5-arylmethylenehydantoins and 5-pyridylmethylenehydantoins

Autor:	Sau-Fun Tan, Gee‐Fung How, Kok-Peng Ang
Rok vydání:	1991
Předmět:	Solvent chemistry.chemical_compound Quenching (fluorescence) chemistry Photoisomerization Photostationary state Organic Chemistry Quantum yield Physical and Theoretical Chemistry Azulene Absorption (chemistry) Photochemistry Cis trans isomerization
Zdroj:	Journal of Physical Organic Chemistry. 4:707-713
ISSN:	1099-1395 0894-3230
DOI:	10.1002/poc.610041202
Popis:	The Z/E photoisomerization of a series of 5-arylmethylenehydantoins and a series of 5-pyridylmethylenehydantoins by direct irradiation in methanol or ethanol solvent was investigated. The isomeric ratios at the photostationary state are dependent on the excitation wavelength and are related to the relative absorption coefficients of the two isomers. Measurements of quantum yields show the absence of quenching effects by oxygen or azulene, suggesting that triplet states either are not involved or are too short-lived for quenching to be observed. Preparative photoisomerization provides a route to the isomer which is not isolated or obtained only as a minor product by the usual method of synthesis.
Databáze:	OpenAIRE
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