ELECTROCHEMICAL INVESTIGATIONS OF LEWIS ACID INTERACTIONS WITH KETONES IN A ROOM-TEMPERATURE IONIC LIQUID

摘要

The voltammetric behavior of fluorenone in the room-temperature ionic liquid 1-ethyl-3-methylimidazolium tetrafluoroborate (EMIBF_4) has been studied. As in acetonitrile, two successive one-electron transfers were observed, although the second process is less reversible in EMIBF_4 than in acetonitrile. Addition of BF_3 etherate produces an additional reduction peak at more positive potentials, indicative of complexation of fluorenone by BF3. Upon addition of aluminum chloride to the melt, formation of chloride is indicated, probably by interaction with the BF_(4-) anion. Complexation of fluorenone still occurs, however, implying that aluminum chloride is converted to another species, possibly BF_3, in this process.