Can. J. Chem. 69, 104 (1991). a-Guaiacoxyacetoverahone, a lignin model compound, has been studied using a combination of laser flash photolysis and steady state quantum yields. Triplet lifetimes range from 175 to 600 ns while the quantum yields of photodegradation vary from 0.06 to 0.6, depending on the solvent. Singlet processes (@ -0.1), previously unobserved for aromatic ketones, are implicated in the mechanism, and account for most or all of the degradation in aprotic solvents.
1992 photochemistry, radiation chemistry, chemoluminescence photochemistry, radiation chemistry, chemoluminescence O 0160 14 -105 Laser Flash Photolysis and Product Studies of the Photoionization of N-Methylacridan in Aqueous Solution. -Monophotonic photoionization followed by deprotonation to give (II) are the two steps in the photolysis of (I) in deaerated solutions. It is shown that in the presence of oxygen (II) is the reactive species which affords the cation (IV). -(SHUKLA, D.; DE REGE, F.; WAN, P.; JOHNSTON, L. J.; J. Phys. Chem. 95 (1991) 25, 10240-10246; Dep. Chem., Univ. Victoria, Victoria, B. C. V8W 3P6, Can.; EN)
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