一些吸电子基α一位上的H在碱存在下转变成烯醇 盐型电子给体: LDA. THE O H3C-C-CH3 H2C-C-CH3 DC=C-CH3 LDA.THE H3C-C-OEt2 H2C-C-oEt2 H2C=C-OE NaoT CH2(CooT) CH(COOEt )2 NaoT H2c-c-c-c-oet 或NOH3C-C-C-C-OEt Organic chemOrganic Chem 一些吸电子基α－位上的 H 在碱存在下转变成烯醇 盐型电子给体： H3C C CH3 O LDA,THF H2C C CH3 O H2C C CH3 O H3C C OEt 2 O LDA,THF H2C C OEt 2 O H2C C OET2 O CH2 (COOEt ) 2 NaOEt CH(COOEt ) 2 H3C C C H2 O C OEt O NaOEt 或NaOH H3C C C H O C OEt O