1,720,998 research outputs found
An easy approach to 1-silylated ketones and asymmetrical 1,6- and 1,8-dicarbonyl compounds
No full textA variety of 1-silylated ketones and asymmetrical 1,6- and 1,8-dicarbonyl compounds are synthesized with 70-85% yields by means of Pd-catalysed selective hydrogenation reactions of the corresponding unsaturated conjugated products, readily available by a previously reported procedure
Heterogeneous catalytic epoxidation of fatty acid methyl esters on titanium-grafted silicas
No full textSupported copper precatalysts for ligand-free, palladium-free Sonogashira coupling reactions
No full textCopper(II) oxide and Cu metal, highly dispersed on inert oxides ( silica, alumina), have been employed as precatalysts in ligand-free, palladium-free Sonogashira coupling reactions. Best results were obtained with highly dispersed Cu metal on alumina, which exhibited high reactivity with aryl iodides. Electron-rich alkynes, in particular arylacetylenes, act as the most effective alkyne substrates. The present catalytic system appears attractive in view of its ease of application and low cost, due to the use of a readily available non-noble metal catalyst combined with the absence of ligands
One-pot conversion of citronellal to isopulegol epoxide on ordered (Ti-MCM-41, [Ti]-MCM-41) and amorphous (MST) mesoporous silica-titania
No full textBifunctional copper catalysts. A one step synthesis of bicyclic ethers starting from alpha,beta-unsaturated ketones
No full textA new, one pot synthesis of bicyclic ethers starting from alpha,beta-unsaturated ketones containing an additional isolated olefinic bond is proposed. It relies on highly chemoselective hydrogenation of the enone group to the corresponding alcohol in the presence of supported copper catalysts, and on the presence of acidic sites on the catalyst support activating the double bond as a carbocation. (C) 1997 Elsevier Science Ltd
REGIOSELECTIVE HYDROGENATION OF 3-PHENYLPROPENAL AND OF TRANS-2-HEXENAL TO SATURATED ALDEHYDES CATALYZED BY ULTRAFINE RHODIUM PARTICLES DISPERSED ON ACRYLIC RESINS
No full textHydroxy-directed diastereoselective epoxidation of terpenic unsaturated alcohols on mesoporous titanium silicates
No full text
- …
