| 초록 |
CO2 in supercritical state has been regarded as a suitable chemical for organic synthesis because of its environmental, inexpensive, nonflammable, and a readily accessible supercritical region. Especially, supercritical CO2 have interesting solvating characteristics and provide greatly increased mass transfer rates to an electrode in an electrochemical system. In spite of these advantages, the usage of supercritical CO2 as a reaction solvent in electrochemical synthesis has lagged for nonpolarity of CO2. Recently, however, the studies in this field of electrocarboxylation of organic compounds with CO2 have been reported. In this study, the electrocarboxylation of organic halides was carried out using acetonitrile (or DMF) solution containing Bu4NBF4 for support electrolyte in a high-pressure view-cell equipped with a magnesium cathode and platinum anode. Reaction temperature was 40℃, pressure was 80bar, and constant current of 10mA (3F/mol) was supplied. Electrocarboxylation of 1-chloronaphtalene undersupercritical CO2 gave regioselectively carboxylic acid (1-naphtolic acid). In this experiment, although we used a reactive metal cathode (magnesium) which play a very important part in the overall process, we didn't gain the satisfying results. However, a detailed study on the reaction to obtain higher yield is now in progress. |
