(1) The property of being nucleophilic.
(2) The relative reactivity of a nucleophilic reagent. (It is also sometimes referred to as "nucleophilic power".) Qualitatively, the concept is related to Lewis basicity . However, whereas Lewis basicity is measured by relative equilibrium constants,
B: + A B+-A- (equilibrium constant K)nucleophilicity of a Lewis base is measured by relative rate constants of different nucleophilic reagents towards a common substrate, most commonly involving formation of a bond to carbon,
B: + A-Z B+-A- + Z:- (rate constant k)See also electrophilicity, Ritchie equation, Swain-Scott equation.
n-* delocalization (or n-* no bond resonance)Delocalization of a free electron pair (n) into an antibonding -orbital (s*).
See hyperconjugation, resonance.
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