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19F NMR spectrum of LDA (0.10 M) with ArH (0.050 M) and diisopropylamine (0.050 M) in 3.5 M THF/hexanes at −78 °C. 1: δ −119.90 (s). 2: δ −127.71 (d, 5JF–F = 31.6 Hz), −88.43 (d, 5JF–F = 31.6 Hz). 17: δ −126.09 (d, 5JF–F = 31.0 Hz), −91.01 (d, 5JF–F = 31.0 Hz). Excess amine was added to establish the balanced equilibrium.
