caa a22 4500 469056576 CHVBK 20180323132845.0 cr unu---uuuuu 170328e19920301xx s 000 0 eng 10.1163/156856792X00056 doi (NATIONALLICENCE)springer-10.1163/156856792X00056 CIDEP studies of the photolysis of the lignin model compound α-guaiacoxylacetoveratrone: the role of triplet reactions in aqueous and hydroxylic solvents [Elektronische Daten] [J. Wan, M. Tse, M. Depew] Free radical reactions induced by the photolysis of the lignin model compound α-guaiacoxylacetoveratrone have been studied by conventional and time-resolved ESR spectroscopy. In the presence of efficient hydrogen donors such as aqueous and hydroxylic solvents the primary reaction involves photoreduction of the triplet phenacyl ether to form the ketyl radical followed by rapid cleavage to the phenacyl radical and guaiacol. Subsequent formation of polarized guaiacoxyl radicals is due to secondary photo-oxidation. The cleavage of the ketyl radical is retarded in basic media and accelerated in acetic acid. Minor reaction pathways involving excited singlets cannot be ruled out by the current CIDEP observations. Springer, 1992 Wan J. Department of Chemistry, Queen's University, K7L 3N6, Kingston, Canada aut Tse M. Department of Chemistry, Queen's University, K7L 3N6, Kingston, Canada aut Depew M. Department of Chemistry, Queen's University, K7L 3N6, Kingston, Canada aut Research on Chemical Intermediates Springer Netherlands 17/1(1992-03-01), 59-75 0922-6168 17:1<59 1992 17 11164 https://doi.org/10.1163/156856792X00056 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1163/156856792X00056 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wan J. Department of Chemistry, Queen's University, K7L 3N6, Kingston, Canada aut NATIONALLICENCE 700 1- Tse M. Department of Chemistry, Queen's University, K7L 3N6, Kingston, Canada aut NATIONALLICENCE 700 1- Depew M. Department of Chemistry, Queen's University, K7L 3N6, Kingston, Canada aut NATIONALLICENCE 773 0- Research on Chemical Intermediates Springer Netherlands 17/1(1992-03-01), 59-75 0922-6168 17:1<59 1992 17 11164 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer