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The kinetics of the reactions of hydroxy radicals with cyclopropane and cyclobutane has been investigated in the temperature range of 298-492 K with laser flash photolysidresonance fluorescence technique. The temperature dependence of the rate constants is given by k l = (1.17 ? 0.15) x T3'' exp[-(1037 * 87) kcal mol-'/RT] cm3 molecule-' s' and kz = (5.06 ? 0.57) x T3"exp[-(228 * 78) kcal mol-'/RT] cm3 molecule-' s-' for the reactions OH + cyclopropane + products (1) and OH + cyclobutane + products (2), respectively. Kinetic data available for OH + cycloalkane reactions were analyzed in terms of structure-reactivity correlations involving kinetic and energetic parameters.

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