Abstract
The intramolecular hydrogen abstraction reaction in a series of polymethylene-linked xanthone and xanthene systems is investigated from the viewpoint of the magnetic field effect of the low-field chemically induced dynamic nuclear polarization (CIDNP) spectra. The magnetic field effect can be successfully simulated with the stochastic Liouville equation, and the effective exchange integral J between the two terminal radicals is determined from the peak of the magnetic field dependence. The effective J values thus determined are much larger than those obtained by the CIDEP method
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