HOH2C HOH2C I04 0 0 HC 1-4苷键： HO OH 1M 0= CH2OH HOH2C NaBH4 H CHOH CHO -0 CH2 CHOH CH2OH 0 OH CH2OH -0 I04 HO HO OH 2M 1-6苷键： H-C CHO NaBH4 CH2OH H2( HCOOH OH CHOH CH2OH OH CH2OH1-4苷键： 1-6苷键： O O HO OH O HOH2 C IO4 1M NaBH4 H CHOH CHOH CH2 OH CH2 OH CHO CH2 OH O O HC O HOH2 C CH O O O O H2 C O HOH2 C CH2 HO OH HC O HC O H2 C O O O CHO CH2 OH CH2 OH CHOH CH2 OH NaBH H 4 2M O IO4 HO HO OH O H2 C O H2 C O H2 C O H2 C O OH OH HCOOH