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Competitive ortholithiation of ArH (0.0050 M) and ArD (0.0050 M) with LDA (0.10 M) in THF (12.2 M) at −78 °C. The curves result from a best-fit numerical integration to the highly simplified model in Scheme 3 and afford kH/kD = 30 (Supporting Information). By contrast, measuring the initial slopes directly affords kH/kD = 40.
