Tomohiko Taniguchi

The crystal structure of cycloinulohexaose produced from inulin by cycloinulo-oligosaccharide fructanotransferase

Abstract The crystal of cycloinulohexaose trihydrate, C 36 H 60 O 30 ·3H 2 O, is trigonal, space group R 3, with unit-cell dimensions a = 24.688 (17), c = 6.477 (3) A for a hexagonal cell, Z = 3. The molecule, which consists of six (2 → 1)-linked β- d -fructofuranose residues, has C 3 symmetry. The conformations of two d -fructofuranosyl moieties in an asymmetric unit are 4 T 3 with P = 348.1° and τ m = 38.9° for Fl, and 4 T 3 with P = 350.5° and τ m = 41.2° for F2. The conformations of OCH 2 CO in the 18-crown-6-ring are gauche - for O-1−C-1−C-2−O-1′ (+ 52.3°) and trans for O-1−C-1′−C-2′−O-1 (+ 163.4°).

Crystal structure of di-β-d-fructofuranose 2′, 1:2,3′-dianhydride

Abstract The crystals of di-β- d -fructofuranose 2′,1:2,3′-dianhydride are monoclinic, space group P 2 1 , with unit-cell dimensions a = 12.8557(14), b = 7.7266(7), c = 7.0322(9)A, β = 97.395(10)°, z = 2. The structure was solved by the direct method, and refined to an R value of 0.046 and an R w value of 0.048 for 2123 observed reflections. The conformations of the furanose rings are 2 E with P = 302.5° and τ m = 39.4° for d -fructose 1, and 3 T 2 with P = 145.7° and τ m = 35.8° for d -fructose 2. The fused, 1,4-dioxane ring has a chair conformation with Cremer-Pople puckering parameters Q = 0.501 A and θ = 8.1°.