7,7,8,8-tetradehydro-7,8-dideoxy-1,2:3,4-di-O-isopropylidene-6-O-(p-nitrobenzoyl)-α-D-glycero-D-galacto-octopyranose 在
potassium carbonate 作用下,
反应 0.33h,
生成
7,7,8,8-tetradehydro-7,8-dideoxy-1,2:3,4-di-O-isopropylidene-β-L-glycero-D-galacto-octopyranose