Aerobic oxidation of alcohols in carbon dioxide with silica-supported ionic liquids doped with perruthenate.
The replacement of toxic Cr(VI) for O2 and of chlorinated solvents for supercritical carbon dioxide (or ionic liquids) in the oxidation of alcohols remains hindered by the low selectivity and activity of the current heterogeneous catalysts. Using an integrated approach that combines sol-gel entrapped perruthenate as aerobic catalyst, an encapsulated ionic liquid as solubility promoter, and scCO2 as the reaction solvent, we have developed a system capable of rapidly converting different alcohols into carbonyl compounds with complete selectivity, including substrates which are otherwise difficult to oxidise. The methodology is generally applicable and may easily be extended to other waste-free, catalytic syntheses of fine chemicals.
Ciriminna
Rosaria
R
Istituto per lo Studio dei Materiali Nanostrutturati, CNR, via Ugo La Malfa 153, 90146 Palermo, Italy.
Hesemann
Peter
P
Moreau
Joël J E
JJ
Carraro
Massimo
M
Campestrini
Sandro
S
Pagliaro
Mario
M
D000332:Aerobiosis; D000438:Alcohols / Q000737:chemistry*; D002245:Carbon Dioxide / Q000737:chemistry*; D002384:Catalysis; D007202:Indicators and Reagents; D010084:Oxidation-Reduction; D012211:Rhenium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D012997:Solvents
D000438:Alcohols; D007202:Indicators and Reagents; D012997:Solvents; D002245:Carbon Dioxide; C015428:perrhenate; D012211:Rhenium; D012822:Silicon Dioxide