Abstract
Emission and enhanced absorption in proton NMR spectra during reactions of phenyl, methyl and other alkyl radicals in solutions are described. For the phenyl and methyl radicals the effects are explained in the correct order of magnitude by a theoretical treatment of the chemically induced dynamic nuclear polarization (CIDNP) given previously. This treatment however does not explain the CIDNP during reactions of alkyl radicals, where emission and absorption occur simultaneously in the NMR multipletts. CIDNP is also observed in fluorine NMR spectra during reactions of fluorine containing radicals.
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