2.系统命名法 0 00 CH3CCH2CH2CHO CH3CCHCCH3 CH2CH=CH2 4-氧代戊醛 3-烯丙基-2,4-戊二酮 4-Oxopentanal 3-Allyl-2,4-pentanedione CHO 环己酮 Cyclohexanone 2-氧代环己基甲醛 2-Oxocyclohexane carbaldehyde U2. 系统命名法 CH3CCH2CH2CHO O O O CHO CH3CCHCCH3 O O CH2CH=CH2 环己酮 2-氧代环己基甲醛 4-氧代戊醛 3-烯丙基-2,4-戊二酮 4-Oxopentanal 3-Allyl-2,4-pentanedione Cyclohexanone 2-Oxocyclohexane carbaldehyde