Effect of methyl substitution on the intramolecular triplet deactivation of p-methoxy-β-phenylpropiophenone

R Boch, C Bohne, JC Netto-Ferreira…

Index: Boch, R.; Bohne, C; Netto-Ferreira, J. C.; Scaiano, J. C. Canadian Journal of Chemistry, 1991 , vol. 69, # 12 p. 2053 - 2058

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Citation Number: 23

Abstract

The photochemistry of several methyl-substituted p-methoxy-β-phenylpropiophenones (1-5) has been examined by nanosecond laser flash photolysis using 337-nm laser excitation. The ketone triplets decay by intramolecular β-aryl quenching of the carbonyl in a well-known process that is believed to involve charge transfer. Surprisingly, methyl substitution at the β- methylene group, which is not a participant in the deactiviation mechanism, causes a ...