Studies of Organic Peroxides. VII. The Decomposition of Symmetrically Substituted Benzoyl Peroxides by Iron (II)

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Abstract
An investigation of the reactions between sym-metrically-parasubstituted benzoyl peroxides and iron (II) has been made. From the apparent first order specific reaction rates, which were obtained from the data of the thermal analysis method, the energy and entropy of activation have been estimated. In this reaction series, the linear enthalpy-entropy relationship was observed. William’s concept of the coördination of iron(II) to the peroxide molecule was assumed, and the effects of substituents on both the enthalpy of activation and the entropy of activation were discussed. It was also found that the Hammett’s equation is approximately applicable, except for nitrosubstituted benzoyl peroxide.