The Electro-Oxidation Of C-H Bonds In EmimAc/MWCNTs Composite

The activation of unreactive C-H bonds serves as an important step in many synthetic transformations.Many reports have been focus on the effective ways to improve the selective activation of C-H bonds.The organic electro-activation of C-H bonds is a kind of green and atomic economical synthesis methodology because it involves only electronic gains and losses.In this paper,the ionic liquid/carbon nanotube composites was prepared and used in the electro-activation of the C-H bond of aromatic compounds in aqueous solution.First,the EmimAc/MWCNTs composite was prepared and characterized through SEM and TEM.The electro-oxidation properties of p-methoxy toluene（p-MT）and its electrochemical kinetics were studied through CV,chronoamperometry and controlled potential electrolysis in the composite electrolyte solution.The results showed that the electrochemical oxidation of p-MT in the composite electrolyte solution was irreversible.The process was mainly controlled by diffusion,and the diffusion coefficient（D）was 7.69×10^-10 cm²·s^-1.Increasing the reaction temperature and the concentration of substrate could promote the electro-oxidation of the C-H bond to the corresponding aldehyde,the yield of p-methoxybenzaldehyde（p-MBA）could improve to 87%,the selectivity could improve to 95%.The electrolysis in one-compartment electrolysis cell was more efficiency and has better selectivity than that in the H-type.When the composite was used as a composite electrode,the yield of the corresponding aldehyde could improve to 88%.After eight times recovering experiments,the composite electrode still has high catalytic stability.Moreover,either as composite electrolyte or composite electrode,the composite also have some applicability for the electro-oxidation of C-H bonds of other aromatic compounds.