Journal
CHINESE JOURNAL OF CATALYSIS
Volume 33, Issue 11, Pages 1825-1831Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(11)60455-5
Keywords
magnetic nanoparticle; silica; Knoevenagel condensation; Michael addition; cyclic diketone
Funding
- Faculty of Chemistry at Semnan University
- Office of Gifted Student at Semnan University
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Sulfonic acid-functionalized silica-coated nano-Fe3O4 particles (Fe3O4@SiO2-SO3H) have been prepared as a novel heterogeneous acid using a facile process. The material was subsequently identified as an efficient catalyst for the synthesis of a variety of tetraketone derivatives via the Knoevenagel condensation and Michael addition reactions of aromatic aldehydes to dimedone, 1,3-indanedione, and 1,3-dimethyl barbituric acid. The catalyst could be readily recovered using a simple external magnet and reused several times without any significant loss in activity. The current catalytic process is both sustainable and economical because it operates under aqueous conditions, the catalyst can be recovered and reused, and the reactions themselves require only a short time and provide the products in high yield.
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