3)反应活性: 醛>脂肪酮>芳香酮 环酮>脂肪酮 a In general, aldehyde are more reactive in nucleophilic addition than are ketones C R H R R Aldehyde Ketone Carbonyl carbon is Carbonyl carbon is more positive less positiveOrganic Chemistry Organic Chemistry Xiamen Xiamen University University 3) 反应活性 醛 > 脂肪酮 > 芳香酮; 环酮 > 脂肪酮 „ In general, aldehyde are more reactive in nucleophilic addition than are ketones. R C H O δ + δ − R C R O δ + δ − Ald ehyd e Ke t o n e Carbony l c a rbon i s m ore p o sitive Carbony l c arbon i s less p o sitiv e