1,2;5,6-Di-O-isopropyl-idene-3-C-nitro-methyl-α-d-allofuran-ose

Crystal structure of 3-de-oxy-3-nitro-methyl-1,2;5,6-di-O-iso-propyl-idene-α-d-allo-furan-ose

The title compound, C13H21NO7 {systematic name: (3aR,5S,6R,6aR)-5-[(R)-2,2-dimethyl-1,3-dioxolan-4-yl]-2,2-dimethyl-6-(nitro-meth-yl)tetra-hydro-furo[2,3-d][1,3]dioxole}, consists of a substituted 2,2-di-methyl-tetra-hydro-furo[2,3-d][1,3]dioxolane skeleton. The furan-ose ring A adopts a (o)T 4 conformation. The fused dioxolane ring B and the substituent dioxolane ring C also have twisted conformations. There are no strong hydrogen bonds in the crystal structure: only weak C-H⋯O contacts are present, which link the mol-ecules to form a three-dimensional structure.

3,6-Didehydro-5-hy-droxy-1,2-O-iso-propyl-idene-5-C-nitro-meth-yl-α-d-gluco-furan-ose

The title compound, C₁₀H₁₅NO₇, consists of one methyl­enedi­oxy ring and two fused tetra­hydro­furan rings. The three fused rings exhibit cis arrangements at the ring junctions. One O atom of a tetra­hydro­furan ring and the H atoms bound to the neighboring C atoms are disordered over two orientations with site-occupancy factors of 0.69 (1) and 0.31 (1). intra­molecular O—H⋯O and C—H⋯O inter­actions stabilize the mol­ecular conformation. In the crystal structure, inter­molecular O—H⋯O and C—H⋯O inter­actions link the mol­ecules into a three-dimensional network.