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Photocyclisation of phenylbenzoquinone: a time resolved photoacoustic calorimetric and flash photolytic study

Journal article published in 2003 by Nitin Chattopadhyay, Carlos Serpa, Luis G. Arnaut ORCID, Sebastião J. Formosinho
This paper was not found in any repository; the policy of its publisher is unknown or unclear.
This paper was not found in any repository; the policy of its publisher is unknown or unclear.

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Abstract

Energetics of formation of the intermediate during the photocyclisation of phenylbenzoquinone (PBQ) to 2-hydroxydibenzofuran (HDBF) in methanol solvent has been investigated by employing the time-resolved photoacoustic calorimetric (TRPAC) technique. The study, in conjugation with the nanosecond/microsecond flash photolytic observations, confirms the formation of a long lived intermediate during the photocyclisation reaction. TRPAC result and semi-empirical (AM1 and PM3) calculations suggest that the intermediate is a biradical.