Mono acetyl Empagliflozin

Mono acetyl Empagliflozin is a structurally related impurity derived from the partial acetylation of one hydroxyl group in the Empagliflozin scaffold. It retains a phenolic hydroxyl group and an acetyl-protected hydroxyl moiety on the pyran ring, while maintaining the core benzene-ether linkage characteristic of the parent compound. The acetyl substitution introduces a ketone functionality, altering its polarity and chromatographic behavior. This impurity arises during synthetic processes involving acetylation steps, where incomplete reaction conditions favor mono-substitution. It serves as a critical HPLC reference standard for quantifying acetylation-related impurities in Empagliflozin drug substance batches.