Zr(HSO4)4/SiO2 as an efficient alternative catalyst for the claisen-schmidt condensation

Abstract

Zr(HSO4)4/SiO2 promotes the regio-, stereo- and chemoselective Claisen-Schmidt condensation of aromatic aldehydes with ketones under solvent-free conditions with improved yields. The work-up of the reaction mixture is simple, and the catalyst is easily removed from the products by simple filtration. © 2008 Verlag der Zeitschrift für Naturforschung.