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°).