Mechanism of decatungstate photocatalyzed oxygenation of aromatic alcoholsPart I. Continuous photolysis and laser flash photolysis studies

Autor:	Rachid Seghrouchni, Ioannis N. Lykakis, Charles Tanielian, Fabien B. L. Cougnon, Michael Orfanopoulos
Rok vydání:	2007
Předmět:	Process Chemistry and Technology Aryl Photodissociation Photochemistry Peroxide Catalysis chemistry.chemical_compound Electron transfer chemistry Benzyl alcohol Kinetic isotope effect Photocatalysis Flash photolysis Physical and Theoretical Chemistry
Zdroj:	Journal of Molecular Catalysis A: Chemical. 262:170-175
ISSN:	1381-1169
DOI:	10.1016/j.molcata.2006.08.092
Popis:	Previous studies on the mechanism of decatungstate photocatalyzed reactions of aliphatic alcohols and of aromatic hydrocarbons in the presence of oxygen suggest that in the corresponding reactions of aryl alcohols, direct electron transfer can compete with hydrogen-atom transfer. A combination of steady-state (O2 consumption measurements under continuous photolysis) and of time-resolved (laser flash photolysis) techniques have been used to investigate the decatungstate photocatalyzed oxygenation of benzyl alcohol, 1-phenylethanol and 1-deuterium-1-phenylethanol. Based upon a series of observations (quantitative formation of peroxide, primary kinetic isotope effect) and the detailed examination of kinetic parameters derived from an extensive kinetic study, it is concluded that aromatic alcohols react by a hydrogen-atom transfer mechanism.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4f819ebf54b72e10ca09855a182139f7 https://doi.org/10.1016/j.molcata.2006.08.092 Zobrazit plný text záznamu Full Text from ScienceDirect