Rates of deuterium and tritium displacement at 25° from the 4position of anisole and phenol in aqueous perchloric acid, together with the data for the detritiation of anisole in aqueous sulphuric acid are reported. Deuterium is displaced more readily than tritium throughout and isotopic rate ratios for the exchange reactions are substantital; kH/kD is 3.93 ± 0.85 for anisole in perchloric acid, 6.50 ± 0.65 for anisole in sulphuric acid and 4.18 ± 1.00 for phenol in perchloric acid. The isotopic effects calculated appear to be constant over a wide range of acidity of both acids. The plots of the observed rates for dedeuteration and detritiation against -[Ho] are linear and thus consistent with an A-SE2 mechanism for the aromatichydrogen exchange recations. The slopes of these plots are also consistent with the earlier findings.
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