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nucleophilic catalysisCatalysis by a Lewis base, involving formation of a Lewis adduct as a reaction intermediate. For example, the hydrolysis of acetic anhydride in aqueous solution catalysed by pyridine: C5H5N + (CH3CO)2O [C5H5NCOCH3]+ + CH3CO2- [C5H5NCOCH3]+ + H2O C5H5N + CH3CO2H + H+aq See also electrophilic, nucleophilicity
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