Abstract
VO(acac) 2 with 1 atm O 2 catalysed the oxidation of adamantane to adamantanone, adamantanols and its esters in propionic acid at 353–393 K. Propionic acid was a more suitable solvent for the oxidation than acetic, butyric, valeric, or hexanoic acids. The maximum yield of oxygenates was 65% (3300 TON) in 360 min. Adamantane solubilities and chemical stabilities of carboxylic acid were important for the oxidation; however, the coordination of carboxylic anions with the vanadium catalyst strongly affected the oxidation activity. The oxidation rate of adamantane was enhanced 3.8 times by the addition of the Eu(OTf) 3 co-catalyst. The product selectivity for various oxidations of alkane and UV–vis spectroscopic studies of V species indicated that an active species was electrophilic vanadium peroxide species coordinated propionic anion and OTf.
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