+2 + +
Solvent

Nucleophilic attack by an alcohol upon acetic anhydride (or acylation of an alcohol by acetic anhydride) yields acetate ester + acetic acid. Alcoholysis.

Reaction defined as:
Functional Group Interconvertion
Substitution: Addition-followed-by Elimination
Substitution: Multi-Step
Substitution: Nucleophilic @ Acyl-Nfg