Chemically induced dynamic nuclear polarization (CIDNP) VII. Photoreactions of aliphatic ketones

Abstract CIDNP during photolysis of diisopropyl ketone is described. In most solvents CIDNP spectra are in accordance with radical pair formation (type I split) from triplet state ketone. In CCl 4 , however, the reaction probably involves complex formation of excited singlet state ketone with the solvent, as evidenced by CIDNP and fluorescence quenching.

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