Acetate esters in particular are often best made via acetic anhydride. While reaction with acetyl chloride is also favorable, it requires an equivalent of base (usually pyridine or trimethylamine) to remove the HCl byproduct. With acetic anhydride, once can use sodium acetate as the base. This is milder, less toxic, and can be used catalytically (0.1 equivalent or so). Other anhydrides are not commercially available and inexpensive (as acetic anhydride is), so this method is not as attractive for making butanoates and so forth.