Propyl Gallate

• Main Authors: Van Hai Nguyen, Minh Ngoc Le, Hoa Binh Nguyen, Kieu Oanh Ha, Thai Ha Van Pham, Thi Hong Nguyen, Nguyet Suong Huyen Dao, Van Giang Nguyen, Dinh Luyen Nguyen, Nguyen Trieu Trinh
• Format: Article
• Language: English
• Published: MDPI AG 2021-04-01
• Series: Molbank
• Subjects: antioxidant; esterification; potassium hydrogen sulfate; propyl gallate
• Online Access: https://www.mdpi.com/1422-8599/2021/2/M1201

The title compound, propyl gallate (<b>III</b>), is an important substance popularly used in the food, cosmetic and pharmaceutical industries. Current chemical syntheses of this compound are based on the acylation supported by thionyl chloride, DIC/DMAP or Fischer esterification using a range of homogenous and heterogenous catalysts. In this paper, an efficient, green, straightforward, and economical method for synthesizing propyl gallate using potassium hydrogen sulfate, KHSO₄, as the heterogenous acidic catalyst has been developed for the first time. In addition, this paper provides a comprehensive spectral dataset for the title compound, especially the new data on DEPT and 2D NMR (HSQC and HMBC) spectra which are not currently available in the literature.