B OH NHN NaBH4 OH 0.写出下列反应的机理: OH OH (1) 2CH3CH, CHO CHiCH,CHCHCHO CH3 HCI (2)HOCH2CH2 CH2CH2CHO OH Br (3) C6Hs COCH3 C6HsCOCH Br CH (4)2 CH3 CCH3 CH3 答案:O A B OH O NO2 NO2 NHNH2 + NO2 NO2 NHN O NaBH4 OH H2SO4 10. 写出下列反应的机理： (1) 2CH3CH2CHO OH CH3CH2CHCHCHO OH CH3 (2) HOCH2CH2CH2CH2CHO HCl O OH (3) C6H5COCH3 C6H5COCH2Br Br2 H (4) OH + CH3CCH3 O H C CH3 CH3 2 HO OH 答案：