3-nitro-α- and β-D-erythro-hex-2-enopyranoside derivatives in methanol, ethanol, and isopropanol with high pressure Hg lamp gave the adducts in moderate yields. The stereoselectivities calculated by AM1 calculation by the use of model compounds with 1,3-dioxolan-2-yl radical are not conflict with those observed in similar photoreaction in 1,3-dioxolane as well as the present results