HCH=CH2+田1Q- CH3CH2CH2B OH CH, CH,CH,MgBr_ CHa COCH3, CH2-C-CH,CH,CH H2O ONa CH3-C-CH2CH2CH3 BICH CH=CH+CH2 =CHCH)OC(CH3) CH, CH, CH3 CH3 OH OH 7.由 BrCH ch2cho合成CH2- CHCHO BrCH,CH2CHO-2EtoH_- BrCH2CH2CH OCh 无水HCl 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 CH3CCH2CH2CCH3 BrCHCH2COCH, HOCH2 CH20H- BrCH2)CCH H Mg 1. CH,CHO BrMgCh, Ch,cch Et2O 2.H32O CH3 CHCH, CH, CCH,- Cro 13吡啶CH3 CCH2CH2CH347 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