(617fj) Base-Free Knoevenagel Condensation Catalyzed By Different Heterogeneous Copper Catalysts
For the first time the Knoevenagel condensation was catalyzed by different forms of elemental copper with high activity and excellent isolated yields. Different sizes & surface functionalities of copper nanoparticles showed different conversion rates. Carbon-coated copper nanoparticles showed low conversion whereas naked, comercially available copper nanoparticles exhibited high activity. It was assumed that the reduced copper surface is the active catalytic site. A succesful scale up (>100 g) reaction was performed without any separation or chormatography resulting in 91 % isolated yield .
Schneider, E.M; Zeltner M.; Kraenzlin N.; Grass R. N.; Stark W. J. Chem. Commun., 2015,51, 10695-10698
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