title: Structure of 3-O-acetylgibberellin A3.
abstract: C21H24O7, Mr = 388.4, orthorhombic, P2(1)2(1)2(1), a = 13.279 (10), b = 15.615 (10), c = 9.427 (8) A, V = 1954.7 A3, Z = 4, D chi = 1.319 g cm-3, lambda(Mo K alpha) = 0.71069 A, mu = 1.0 cm-1, F(000) = 824, T = 293 K, R = 0.049 for 1805 observed reflections. The gibberellane skeleton shows the conformational variety characteristic of many other gibberellin derivatives. Ring A is in a sofa conformation while the five-membered ring B assumes an intermediate conformation between an envelope and a half-chair. The lactone ring is in an ideal envelope conformation and shows a marked difference in its two C-O distances. Each molecule is hydrogen bonded to two others to form continuous spiral chains along the c axis.
authors.affiliation: Department of Chemistry, University of Oklahoma, Norman 73019.
authors.forename: M B
authors.initials: MB
authors.lastname: Hossain
authors.forename: D
authors.initials: D
authors.lastname: van der Helm
authors.forename: R
authors.initials: R
authors.lastname: Sanduja
authors.forename: M
authors.initials: M
authors.lastname: Alam
mesh_terms: D005875:Gibberellins; D006860:Hydrogen Bonding; D008958:Models, Molecular; D008968:Molecular Conformation; D014961:X-Ray Diffraction / Q000379:methods
chemical_list: D005875:Gibberellins; C062541:3-O-acetylgibberellin A3