(2)Zn, H,O (3) HBr CH2 CH3 CCla 答案: (1) COCH (2)Zn, H,O CHO CH3 HCI -CH3 Br2 CH3 (3) (4) HBr CH3 CH, CHCH, CH3 -CH2CH3 B B CCl4 2.写出下列化合物最稳定的构象CH3 (1)O3 (2)Zn,H2O CH3 HCl CH3 Br2 hγ CH2CH3 HBr Br2 CCl4 (1) (2) (3) (4) (5) 答案： CH3 (1)O3 (2)Zn,H2O CH3 HCl CH3 Br2 hγ CH2CH3 HBr Br2 CCl4 (1) (2) (3) (4) (5) CHO COCH3 CH3 Cl CH3 Br CH3CH2CHCH2CH3 Br Br Br 2. 写出下列化合物最稳定的构象：