Time-dependence of the polarized intensity ratio in CIDNP investigations

The time-dependence of the polarized intensity ratio within a product molecule has been studied by a kinetic method. The kinetic analysis of polarized product formation shows that considerable changes in CIDNP ratios occur during the reaction but characteristic curves can be obtained under different experimental conditions. A method is proposed to evaluate the relative enhancement coefficients on the basis of these characteristic curves, and to obtain information on the kinetics of the reaction.