[en] The abstraction of a deuterium atom from the CD₃ group in deuterotoluenes is more accelerated by pressure than the abstraction of a hydrogen atom from the toluene methyl group, which is reflected in a decrease in the kinetic isotope effect k/sub H//k/sub D/ with increasing pressure. The value for k/sub H//k/sub D/ = ([DMPC]/[AP])H/([DMPC]/[AP])/sub D/ were determined by measurement of the amounts of dimethylphenylcarbinol (DMPC) and acetophenone (AP) formed upon the decomposition of 0.1 mole/liter dicumyl peroxide in C₆H₅CH₃, C₆H₅CD₃, and C₆D₅CD₃ at 399⁰K

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