CH3CH=CH2+HBr- CH3CH,CH. Br-Mgo OH CH, CH, CH, MgBr L: COCH- CH3-C-CH,CH,CH;-Na H2O CH3-C-CH2CH2CH3 BrCH CH=CH+CH2=CHCH,OC(CH3),CH,CH2CH3 CH OHOH 7.由BCH2CH2CHO合成CH2- CHCHO BrCH-CH2CHo-2EtOH OC2H5 无水 HC BrCH2CHCH 答 KMno OH OH CH2= CHCH(OC2H5)2 OH CH2CHCH(OC2H5)2 OH OH CH2-CHCHO O 8.以BrCH2CH2COCH3为原料合成 CH3CCH2 CHCCH3 BrCH CH2COCH, HOCH2CH2 0H BrCH2 CH2CCH H Mg BrMgCH, CH, CCH2- 1. CH3CHO Et2O 2.H2O OH CH, CHCH, CH,CCH2 Cro 吡啶-(CH3 CCH2CH2CCH247 CH3CH CH2 Mg Et2O + HBr H2O2 CH3CH2CH2Br 2. H3O + CH 1. CH3COCH3 3CH2CH2MgBr CH3 CH3 C OH CH2CH2CH3 Na CH2 BrCH2CH CH2 CHCH2OC(CH3 )2CH2CH2CH3 CH3 CH3 C ONa CH2CH2CH3 7．由 BrCH2CH2CHO 合成 CH2 CHCHO OH OH 答： BrCH2CH2CHO OC2H5 2EtOH OC2H5 无水HCl BrCH2CH2CH OH - CH2CHCH(OC2H5 )2 CH2 OH CHCH(OC2H5 )2 - KMnO4 OH OH CH2 CHCHO H3O + OH OH 8．以 BrCH2CH2COCH3为原料合成 O O CH3CCH2CH2CCH3 答： BrCH2CH2CCH3 O BrCH2CH2COCH3 H + HOCH2CH2OH O BrMgCH2CH2CCH3 O 2. H3O + O Mg Et2O 1.CH3CHO OH O O CH3CHCH2CH2CCH3 CH3CCH2CH2CCH3 O CrO3 吡啶