b.脱水 a-羟基酸 (R)CH3 O、_∠O (R)CH3-CH-OtH HOFC=O CH C 0=C+OH H-O-CH-CH3(R) C、CH OO CH3(R) 尸羟基酸 OH CH3-CH-CH2-COOH A 4 CH3CH=CH-COOH + H2O a-不饱和酸 Organic chemOrganic Chem b. 脱水 α-羟基酸 β-羟基酸 CH3 CH OH CH2 COOH CH3 CH CH COOH H + + H2 O α,β-不饱和酸 (R)CH3 CH C O OH H O O CH C CH3 (R) HO O H CH C O CH C (R)CH3 O O O CH3 (R)