(1) Al-Hg CH3 CH2COCH3 H2SOCH3 CH3CH2C—CH2Sh CH3CH2 CCH3 H3O CHO HSCh2 CH2CH2 CH2 SH BuLi CH3 CH-CH Li (1)NaBH4 CICH2 COCH3 (2)Hgso CH, CHCH H,O OH P(OEt)3+ BrcH2CO0C2H5-(EtO) PCH2 COOCzHs CH3 (1)C,SoNA CH3C=CHCOOC2 CHCH3CH2COCH3 O S S CH2SOCH3 CH3CH2C O CH2SHOCH3 Al-Hg H3O + CH3CH2CCH3 (1) O (2) CHO + HSCH2CH2CH2CH2SH H BuLi S S Li CH3CH CH2 O S S CH2CHCH3 OH HgSO4 H2O O OH 或 S S Li ClCH2COCH3 S S CH2CHCH3 OH (1)NaBH4 (2)HgSO4 O OH (3) P(OEt)3 + BrCH2COOC2H5 (EtO)2PCH2COOC2H5 O C2H5ONa CH3COCH3 (1) (2) CH3C CHCOOC2CH5 CH3