Oligomeric ricinoleic acid preparation promoted by an efficient and recoverable Brønsted acidic ionic liquid

• Fei You,
• Xing He,
• Song Gao,
• Hong-Ru Li and
• Liang-Nian He

Beilstein J. Org. Chem. 2020, 16, 351–361, doi:10.3762/bjoc.16.34

• and green preparation processes are the two key features for the development of green products. As a bio-lubricant in metalworking fluids, estolides of ricinoleic acid are considered as the promising substitute to mineral oil with a favorable viscosity and viscosity index. Thus, an efficient and

• mentioning that the IL catalyst can be used at least for five cycles with high catalytic activity. As a result, the protocol based on the IL catalyst, i.e. [HSO3-BDBU]H2PO4 shows great potential in industrial production of oligomeric ricinoleic acid from ricinoleic acid. Keywords: bio-lubricant; ionic

• under the catalysis of [HSO3-BDBU]H2PO4 can afford the standard-compliant bio-lubricant oligomeric ricinoleic acid. Reusability of [HSO3-BDBU]H2PO4 As the IL catalyst [HSO3-BDBU]H2PO4 is immiscible with the product at room temperature, stratification occurs after reaction, thus renders an easy catalyst