系统命名法: CH3 CH CHb-CH--CHO 2-甲基丁醛(ax甲基丁醛 2-methylbutanal CH CH2-CH-CHo-C-CH 4-甲基-2戊酮 4-methyl-2-pentanoneCH3 CH2 CH CH3 CHO 2-甲基丁醛(-甲基丁醛) 2-methylbutanal 4 3 2 1 γ β α CH3 CH CH3 CH2 C O CH3 4-甲基-2-戊酮 4-methyl-2-pentanone 1 5 4 3 2 系统命名法：