title: Structures of two dideoxynucleosides: 2',3'-dideoxyadenosine and 2',3'-dideoxycytidine.
abstract: 2',3'-Dideoxyadenosine, C10H13N5O2, Mr = 235.24, orthorhombic, P2(1)2(1)2(1), a = 7.7404(4), b = 9.9843(9), c = 14.0842(10) A, V = 1088.46 A3, Z = 4, Dx = 1.435 Mg m-3, lambda(CuK alpha) = 1.5418 A, mu = 0.8326 mm-1, F(000) = 496, T = 296 K, final R = 0.032 for 1088 observed reflections. 2',3'-Dideoxycytidine, C9H13N3O3, Mr = 211.21, tetragonal, P4(1)2(1)2, a = 8.6802(4), c = 26.1386(14) A, V = 1969.44 A3, Z = 8, Dx = 1.424 Mg m-3, lambda(CuKa) = 1.5418 A, mu = 0.8701 mm-1, F(000) = 896, T = 296 K, final R = 0.050 for 1116 observed reflections. In both compounds the sugar rings have conformations intermediate between envelope and half chair but somewhat different pseudorotations. The relative orientations of the sugar and base are different in the two molecules with dideoxyadenosine being at the boundary of syn and anti and deoxycytidine being anti.
authors.affiliation: Laboratory of Chemistry, National Heart, Lung, and Blood Institute, Bethesda, MD 20892.
authors.forename: J V
authors.initials: JV
authors.lastname: Silverton
authors.forename: F R
authors.initials: FR
authors.lastname: Quinn
authors.forename: R D
authors.initials: RD
authors.lastname: Haugwitz
authors.forename: L J
authors.initials: LJ
authors.lastname: Torado
mesh_terms: D003461:Crystallography; D016048:Dideoxyadenosine; D006860:Hydrogen Bonding; D008968:Molecular Conformation; D015394:Molecular Structure; D014961:X-Ray Diffraction; D016047:Zalcitabine
chemical_list: D016048:Dideoxyadenosine; D016047:Zalcitabine