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Competitive ortholithiation of ArH (0.0050 M) and ArD (0.0050 M) with LDA (0.10 M) in the presence of 0.020 M ArLi in 12.2 M THF at −78 °C. The curves result from a best-fit numerical integration to the highly simplified model in Scheme 3 and afford kH/kD = 6.3. Fitting the initial rates of both decays (linearly) directly affords kH/kD = 12.
