Journal
REACTION KINETICS MECHANISMS AND CATALYSIS
Volume 125, Issue 2, Pages 789-806Publisher
SPRINGER
DOI: 10.1007/s11144-018-1439-4
Keywords
Magnetic nanoparticles; PEI; Supported ruthenium species; Tandem reaction; Knoevenagel condensation; Aerobic oxidation
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Funding
- National Natural Science Foundation of China [21476057]
- Natural Science Foundation of Hebei Province (CN) [B2016202393, B2015202284]
- Program for the Top Young Innovative Talents of Hebei Province (CN) [BJ2017010]
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The immobilization of ruthenium species on polyethylenimine (PEI) modified magnetic nanoparticles coated with silica afford a multifunctional catalyst (Fe3O4@SiO2@PEI@Ru(OH)(x)) for the aerobic oxidation/Knoevenagel condensation of alcohols and active methylene compounds. A wide scope of alcohols and malononitrile could be converted to their corresponding condensation products in excellent yields under mild conditions. This catalyst has advantages of leaching-free of ruthenium species and ease of recovery by an external magnet. The activity deactivation of the catalyst was investigated and was ascribed to the transformation of surface Ru3+ to Ru4+ in the process of aerobic oxidation of alcohols.
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