Table 2 The yield of various heterogeneous catalysts mediated for 3-methylcyclohexenone dehydrogenative oxidation.

The reactions were carried out in 10 ml of dimethyl sulfoxide (DMSO) solutions containing 1 mmol of 3-methylcyclohexenone, 0.03 mmol of Pd-equivalent catalysts, and 1.2 mmol of TFA under 1 atm of oxygen at 100°C for 24 hours.

EntryCatalystFirst-cycle yield (%)Second-cycle yield (%)
1HB-Pd/C9383
2AB-Pd/C7424
3CB-Pd/C5748
4Commercial Pd/C67<1