Positive photocatalysis of a diels-alder reaction by quenching of excited naphthalene-indole charge-transfer complex with cyclohexadiene

Naphthalene photocatalyzes formation of cyclohexadiene-indole cycloadducts in a wavelength-dependent process. Steady-state irradiation and time-resolved fluorescence studies agree well with NP-InH ground-state charge transfer (CT) complexes as the key species responsible for the photocatalyzed process.