Patent ID: 8546609

Claim:
An ionic liquid of formula [1]: wherein R 1 to R 3 and n number of R 4 are each independently a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, R 5 to R 7 are each independently an alkyl group optionally substituted with a hydroxyl group or an alkoxy group, an aralkyl group, or an aryl group, R 8 is an alkyl group optionally substituted with a hydroxy group or an alkoxy group, an aralkyl group, an aryl group, or a group of formula [2]: wherein T is an alkylene chain having 1 to 8 carbon atoms, n is 1 or 2, and R 1 to R 7 are the same as above, X is a nitrogen atom or a phosphorus atom, n is 1 or 2, and when n is 1, R 3 and R 4 may be bound together with the adjacent carbon atoms to form a cyclohexene ring, when X is a nitrogen atom, R 5 to R 7 or R 5 to R 6 may form a hetero ring with the nitrogen atom binding thereto, and when R 8 is a group of formula [2], X is a nitrogen atom.