Irradiation of trans-penta-1,3-diene at 254 nm yields penta-1,4-diene as a photoproduct in the vapour but not in the condensed phase; Stern–Volmer treatment of this quenchable reaction allows the calculation of the absolute rate constant and the deduction of a lifetime of ca. 2 × 10–8 s for the lowest excited singlet diene.
A. Delaby and S. Boué, J. Chem. Soc., Chem. Commun., 1973, 818 DOI: 10.1039/C39730000818
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