AbstractHydrogen abstraction by 1‐phenylethyl radicals (ṘH) from phenylmethyl‐carbinol (HROH) and benzyl alcohol (H2R′OH) has been studied in the liquid phase at 120°C. 1‐Phenylethyl radicals have been generated by thermal decomposition ofazo‐bis‐1‐phenyl ethane and the formation of ethylbenzene (RH2), acetophenone (RO), and 2,3‐di‐phenyl butane (R2H2) has been monitored during the reaction.In order to optimize the experimental conditions, a mechanism has been assumed for the various pathways of the disappearance of ṘH and by using estimated rate parameters a presimulation was performed.The relative rate constants obtained are:\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {\frac{{k_{\rm H} }}{{\sqrt {{\rm 2}k_t } }} = 1.4{\rm } \times {\rm }10^{ - 4} {\rm L}^{1/2} {\rm mol}^{ - 1/2} {\rm s}^{ - 1/2} } & {{\rm for}} & {{\rm HROH}} \\ \end{array} $$\end{document}and\documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {\frac{{k_{\rm H} }}{{\sqrt {{\rm 2}k_t } }} = 1.0{\rm } \times {\rm }10^{ - 4} {\rm L}^{1/2} {\rm mol}^{ - 1/2} {\rm s}^{ - 1/2} } & {{\rm for}} & {{\rm H}_{\rm 2} {\rm R'OH}} \\ \end{array} $$\end{document}wherekHrefers to the hydrogen abstraction whilektis the combination rate coeffici