... lacton: NaOH , ∆ 2H [Na/Hg] 4H[LiAlH4] CH2 CH2 CH2 C O O γ−Butyrolacton HO (CH2)2COOH CH3(CH2)2COOH HO(CH2)4OH HX X(CH2)3COOH KCN NC(CH2)3COOK CH2 -H2O CH2 C O CH3NH2 CH2 -H2O 22 CH2 CH2 NH3 N H Pyrrolidon ... H2NOH H O OH 1- CH3MgBr 2- H3O+ HOCH 2CH2CH2CH2CH2OH HOCH 2CH2CH2CH2CH=NOH OH HOCH 2CH2CH2CH2CHCH H CH3COCl O H2Cr2O7 Aldoxim O Ester OCOCH3 C O Lacton 29 Ceto-aldehyd, ceto-acid, ceto-ester 2. 1 ... tư (vßng lacton) 21 ∆ CH2 CH2 C O H2C γ H2C + H 2O C O O γ-Butyrolacton H2C OH HO Acid γ -hydroxybutyric CH2 CH2 CH2 C H2C δ H2C Hc H+ CH2 ∆ O H2C Hoặc H+ OH HO CH2 O CH2 C O + H2O δ− Valerolacton...