| 초록 |
For the optimal utilization of abundant natural gas, direct oxidative methane functionalization using an environmental benign and inexpensive oxidant, dioxygen O2, is very important. Co(OAc)2-NHPI catalyst system was known to activate C-H group in alkanes such as cyclohexane, ethane, and isobutane in the presence of O2. In this reaction system, NHPI (N-hydroxyphthalimde) acts as a radical mediator to activate stable C-H bond. In this study, we conducted methane oxidation using Co(II)-NHPI-O2 system in the presence of CF3CO2H as a solvent to synthesized trifluoroacetate CF3CO2Me, a methanol precursor. In the presence of NHPI, the catalytic activity increased significantly and the catalytic activity highly depended on the reaction time as well as the catalyst concentration. Degradation of NHPI was also monitored using IR and 1H-NMR. |
