iii. OHCCOOC2Hs+CH3COOC2H5 1)NaOH 2)H20 OHCCH2COOC2H5 太活泼 C2H500C COOC2H5 -3H20 聚合 COOC2H5 c.分子内酯缩合(W.Dieekmann缩合) COOC2Hs Na H' COOC2H5少量乙醇 COOC2H5 Organic Chem Organic Chem c. 分子内酯缩合（W.Dieekmann缩合） COOC2 H5 COOC2 H5 Na 少量乙醇 H+ O COOC2 H5 OHCCOOC2 H5 + CH3 COOC2 H5 1) NaOH 2) H2 O OHCCH2 COOC2 H5 - 3 H2 O C2 H5 OOC COOC2 H5 COOC2 H5 太活泼 聚合 iii