3.从 Grignard试剂制备: C-o+R-MgX-HC-OMgX-H20,H-C-OH H o+R-MgX-R'C--OMgX-H0 ,R'C--OH R R -=O +RMgX R—C—OMg-0,RC-OH3. 从Grignard试剂制备： C O H H + R MgX H C H OMgX R H2O H C H OH R C O H R' + R MgX R' C H OMgX R H2O R' C H OH R C O R'' R' + R MgX R' C R'' OMgX R H2O R' C R'' OH R