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3
제1항에 있어서, 상기 불포화 락톤 화합물(ii)은 2(5H)-퓨라논(2(5H)-furanone), 5-메틸-2(5H)-퓨라논(5-methyl-2(5H)-furanone), 5-에틸-2(5H)-퓨라논(5-ethyl-2(5H)-furanone), 5-프로필-2(5H)-퓨라논(5-propyl-2(5H)-furanone), 5-부틸-2(5H)-퓨라논(5-butyl-2(5H)-furanone), 5-펜틸-2(5H)-퓨라논(5-pentyl-2(5H)-furanone), 5-헥실-2(5H)-퓨라논(5-hexyl-2(5H)-furanone), 5-에틸렌-2(5H)-퓨라논(5-ethylene-2(5H)-furanone), 5-프로필렌-2(5H)-퓨라논(5-propylene-2(5H)-furanone), 5-부틸렌-2(5H)-퓨라논(5-butylene-2(5H)-furanone), 5-펜틸렌-2(5H)-퓨라논(5-pentylene-2(5H)-furanone), 5-페닐-2(5H)-퓨라논(5-phenyl-2(5H)-furanone), 5-벤질-2(5H)-퓨라논(5-benzyl-2(5H)-furanone), 5-플루오로-2(5H)-퓨라논(5-fluoro-2(5H)-furanone), 5-클로로-2(5H)-퓨라논(5-chloro-2(5H)-furanone), 5-브로모-2(5H)-퓨라논(5-bromo-2(5H)-furanone), 5-요오도-2(5H)-퓨라논(5-iodo-2(5H)-furanone), 3,5-디메틸-2(5H)-퓨라논(3,5-dimethyl-2(5H)-furanone), 4,5-디메틸-2(5H)-퓨라논(4,5-dimethyl-2(5H)-furanone), 3,5-디플루오로-2(5H)-퓨라논(3,5-difluoro-2(5H)-furanone), 4,5-디플루오로-2(5H)-퓨라논(4,5-difluoro-2(5H)-furanone), 3,5-디페닐-2(5H)-퓨라논(3,5-diphenyl-2(5H)-furanone), 4,5-디페닐-2(5H)-퓨라논(4,5-diphenyl-2(5H)-furanone), 3,5-디벤질-2(5H)-퓨라논(3,5-dibenzyl-2(5H)-furanone), 4,5-디벤질-2(5H)-퓨라논(4,5-dibenzyl-2(5H)-furanone), 3,4,5-트리메틸-2(5H)-퓨라논(3,4,5-trimethyl-2(5H)-furanone), 3,4,5-트리플루오로-2(5H)-퓨라논(3,4,5-trifluoro-2(5H)-furanone), 3,4,5-트리페닐-2(5H)-퓨라논(3,4,5-triphenyl-2(5H)-furanone), 및 3,4,5-벤질-2(5H)-퓨라논(3,4,5-tribenzyl-2(5H)-furanone)으로 구성된 군에서 선택된 것이 특징인 전해액
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