Grafted non-ordered niobium-silica materials: Versatile catalysts for the selective epoxidation of various unsaturated fine chemicals

• Mesoporous Nb(V)-silica catalysts prepared via dry impregnation or grafting technique.
• Used as catalysts with aqueous H2O2 for the epoxidation of unsaturated terpenes.
• Robust in the presence of water and versatile with various alkene substrates.
• High yields (up to 73%) and excellent selectivities to epoxides (up to 98%).

Two kinds of niobium(V)-silica catalysts for the selective epoxidation were synthesised by post-synthesis modification of non-ordered mesoporous silica supports, starting from niobocene dichloride via solvent-less organometallic precursor dry impregnation or conventional liquid-phase grafting technique. Grafted Nb/SiO2 solids were used as catalysts, in the presence of aqueous H2O2, for the epoxidation of unsaturated cyclic and terpenic compounds of interest for fine and specialty chemistry, in particular: cyclohexene, 1-methylcyclohexene, limonene, carveol, α-terpineol, isopulegol, carvotanacetol, carvone, as well as squalene and isopulegyl acetate. These catalysts showed high yields (up to 73%) and excellent chemoselectivities to the desired epoxides (up to 98%), also in short reaction times (down to 1 h).

Figure optionsDownload high-quality image (130 K)Download as PowerPoint slide