Taft equation

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The Taft equation^[1]

log k = log k₀ + Ï*σ* + δE_s

like the Hammett equation, to which it is related, correlates the rate constants, k, of a group of chemically-related compounds with changes in substituents. The Taft equation has an additional term, δE_s, to represent the contribution from steric effects.

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