Abstract
Intramolecular energy transfer in 5‐phenyl‐2‐pentene has been studied monitoring cis–transisomerization of solutions of the compound in cyclohexane. The intersystem crossover yield of the phenyl moiety is calculated to be 0.66 or less. The rate of intramolecular energy transfer is found to be much faster than that of intermolecular energy transfer in the concentration range studied.

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