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Two nucleophilicity scales (N′ and N′′) including 96 nucleophiles, spanning 1017 in rate constant, have been constructed directly from experimental rate constants for reactions of nucleophiles with two benzhydrylium cations in dichloromethane at 20°C. The two scales are linked by the formula: N′ – N′′ = 6.6. In contrast, published procedures (H. Mayr etal. J. Am. Chem. Soc. 2001, 123, 9500, and later...
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