A metal doped strategy was developed via a facile one-step solvent reduction approach, for reducing Pt, Ru and Pd metal ions supported on carbon nanotubes and preparing ternary metal alloy nanoparticles supported on carbon nanotubes (CNTs)...
2‐Hydroxyadipic Acid Production by Oxidation of 2‐Hydroxycyclohexanone with Molecular Oxygen
Von Wiley-VCH zur Verfügung gestellt
Aerobic oxidative C−C bond cleavage reaction of lignin-derived 2-hydroxycyclohexanone to 2-hydroxyadipic acid, a potential monomer, was discovered. This new reaction was catalyzed by various substances, and phosphovanadotungstic acid was the best catalyst.
Oxidation of 2-hydroxycyclohexanone (2-HCO) which can be synthesized from both petroleum and biomass was investigated with heteropolyacids and oxygen as catalysts and oxidant, respectively. 2-Hydroxyadipic acid (2-HAA) was obtained in moderate yields, and H4PVW11O40 gave the highest yield (39 %). 2-HAA is a dicarboxylic acid expected to be a monomer, and this work is the first report for production of 2-HAA by catalytic oxidation reactions. The oxidation of 1,2-cyclohexanedione (CHDO), which is a potential intermediate of 2-HCO oxidation, produced similar yield of 2-HAA even without catalyst. The effects of catalyst amount (first order), oxygen pressure (almost zero order) and the addition of radical scavenger (no effect) on the 2-HCO oxidation with H4PVW11O40 catalyst were similar to those in a related case of 2-methoxycyclohexanone oxidation to adipic acid with heteropolyacid catalyst. 2-HCO is proposed to be oxidized to CHDO as a precursor of 2-HAA in a similar mechanism to 2-methoxycyclohexanone oxidation.Zum Volltext
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