(a)CH2( COOC2H5)2 chach CH(CooC,Hs), (D)C2HsONa CaH (1)OH (CH3 CH2)2C(COoC2 H5)2 ( CH3CH2)2CHCOOH CH3CH2 CHCH2CH3_Mg. CHCH2CHcH2CH2①)CO2 乙醇 (2)H2O CH3 CH2 CH3 MaBr COOH CH3CH2 CH3 NaCN CH? CH2 CHCH2CI CH3CH2 CHCH2 CH3 CN (a)C6Hs CHO CH3COC6H5 Chs oNa C6HsCH (b)CsHsCH=CHCOOH+ SoCl2 HsCH=— CHCOCI C6H5 CH==CHCOC6 H5 (C)CsHg COCH2 Br +P(OC,Hs) H5CoCH2 P(oc2 H5)2 CBHS COCHP(OC2H5)2-2 C6H5COCH=CHC6H5(a) (c) CH2(COOC2H5)2 (1) C2H5ONa (2) C2H5Br CH3CH2CH(COOC2H5)2 (1) C2H5ONa (2) C2H5Br (2) (CH3CH2)2C(COOC2H5)2 (1) (2) OH H3O (CH3CH2 )2CHCOOH (b) CH3CH2CHCH2CH3 Br Mg 乙 醇 CH3CH2CHCH2CH3 MgBr (1) (2) H3O CO2 CH3CH2CHCH2CH3 COOH CH3CH2CHCH2CH3 Br NaCN CH3CH2CHCH2CH3 CN H3O CH3CH2CHCH2CH3 COOH (3) (a) C6H5CHO + CH3COC6H5 C2H5ONa C6H5CH CHCOC6H5 (b) C6H5CH CHCOOH + SOCl2 C6H5CH CHCOCl AlCl3 C6H5CH CHCOC6H5 C6H5COCH2Br + P(OC2H5)3 C6H5COCH2P(OC2H5)2 O C2H5O C6H5COCHP(OC2H5)2 O C2H5CHO C6H5COCH CHC6H5