Oxygenation of aromatic substrates over Pd(II) catalysts bearing bis(pyrazol-1-yl)alkanes ligands

Liquid phase oxygenation of 1-tetralin, ethylbenzene, cyclohexane and toluene is describe using four catalyst precursors such as: (CH2)n(PzR)PdCl2 (n=1,2; R=H, Me) at T=100°C, Pair= 5.4 atm, substrate/catalyst ratio=100 for 3 h,. It was observed that the type of alkyl bridge between the pyrazolyl ligands has an effect on the catalytic activity.