Abstract
Catalytic application of niobium catalysts is presented in this work. The regioselective oxidation of geraniol was studied over niobium catalysts using hydrogen peroxide (H2O2) as oxidant in the absence of any organic solvent. The catalysts studied were crystalline Nb2O5 bulk, a mixed oxide of Nb2O5/SiO2 (N-S) and Nb2O5/SiO2 mesoporous (N-M). The catalysts were characterized by nitrogen adsorption– desorption isotherms at 77 K, X-ray diffraction (XRD) and UV-Vis. High selectivity to the allylic C=C double bond was observed in all catalysts studied. However, for Nb-M and N-S the selectivity to epoxide decreases with the conversion, contrary to observed for Nb2O5 bulk. The differences in selectivity may be due to different routes for the activation of oxidant over the metallic center. This work proposes a useful application of Nb2O5 commercially available in selective organic reactions.
Keywords: Niobium catalysts, Green chemistry, Regioselectivity, Epoxidation, Geraniol, Hydrogen peroxide.
Call for Papers in Thematic Issues
Catalytic C-H bond activation as a tool for functionalization of heterocycles
The major topic is the functionalization of heterocycles through catalyzed C-H bond activation. The strategies based on C-H activation not only provide straightforward formation of C-C or C-X bonds but, more importantly, allow for the avoidance of pre-functionalization of one or two of the cross-coupling partners. The beneficial impact of ...read more
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