例 OH H3C-C-CH3+ NaCN 稀H2SO4 H3C-C-CH CN 稀HC|/△ 浓H2SO/D (稀NaOH/△) H2C=C-COOH K 3 I3C-C-COOH CH 3例： H3C C CH3 O + NaCN 稀H2 SO4 H3C C CH3 OH CN H3C C COOH OH CH3 H2C C COOH CH3 稀HCl /  (稀NaOH / ) 浓H2 SO4 