The solvent-free oxidation of cyclohexene over gold-supported catalysts
Au/OMS-2 and Au/La-OMS-2 with molecular oxygen has been
reported with less than 50% total conversion [8]. Ti-containing
mesoporous silica has also been examined for the oxidation of
alkenes [9]. Recently, a palladium oxide-based catalyst was applied
to the allylic oxidation of cyclohexene with t-BuOOH in acetonitrile
achieving high conversions and selectivity to cyclohexenone
[10]. Toluene oxidation was also demonstrated, catalysed by Au-Pd
alloy nanoparticles supported on carbon or TiO2 under solventfree
conditions [11].