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°.