The formation of the takes place when phenol and benzoyl chloride reacts in the presence of pyridine.

Phenol reacts with an aromatic acid chloride in the presence of the excess NaOH at room temperature to give ester. This reaction is called Schotten Baumann reaction. The presence of the base is to absorb acidic proton.

Phenoxide ion reacts rapidly with benzoyl chloride in comparison to phenol.