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On the basis of the reaction mechanism established in the preceding paper (this volume, p. 376), the changes in rate of photo-oxidation observed in intermittent light when a rate contribution is made by a simultaneous dark reaction have been rigorously analyzed. Using this analysis and the relevant experimental data, the velocity coefficients of the rate con­trolling propagation and termination reactions have been separately evaluated forcyclo hexene, 1-methylcyclo hexene, dihydromyrcene and ethyl linoleate. The significance of the results in interpreting the finer details of the oxidation mechanism is discussed; and the numerical values are compared with similar data reported for polymerization systems. A criterion for detecting anomalous effects due to intense light absorption is derived; further to the evidence presented in the preceding paper, ethyl linoleate undergoing oxidation in light of wave-length 2537 Å is found to exemplify this behaviour.

The determination of absolute rate constants in olefinic oxidations