Methyl p-Toluate

Methyl p-toluate is an aromatic ester characterized by a para-methyl-substituted benzene ring linked to a methoxy carbonyl group via an ester bond. Its molecular architecture features a conjugated π-system and electron-donating methyl substituent, influencing its reactivity and stability. As an API impurity, it arises from esterification side reactions during parent drug synthesis. This compound serves as a critical HPLC reference standard for quantifying ester-related impurities in pharmaceutical formulations.