title: Crystal structure of steroidal monoenes obtained by reduction of the aromatic A ring of 13-ethyl-3-ethoxy-gona-1,3,5(10)-triene-11alpha,17beta-diol.
abstract: The crystal structures of 13-ethyl-gona-1(10)-ene-11alpha,17beta-diacetate (3b) and 13-ethyl-10alpha-gona-4-ene-11alpha,17beta-diacetate (5b), two steroidal monoenes obtained as minor products from the reduction, then acetylation, of the aromatic A ring of 13-ethyl-3-ethoxy-gona-1,3,5(10)-triene-11alpha,17beta-diol (1), were determined by X-ray diffraction. The conformations of the rings A, B, C, and D and the unusual stereochemistry at C-10 of the 10alpha-gona-4-ene (5b) are discussed.
authors.affiliation: Dipartimento di Chimica, Biochimica e Biotecnologie per la Medicina, Università di Milano, Via Saldini 50, 20133 Milano, Italy.
authors.forename: Emilia
authors.initials: E
authors.lastname: Modica
authors.forename: Federica
authors.initials: F
authors.lastname: Compostella
authors.forename: Diego
authors.initials: D
authors.lastname: Colombo
authors.forename: Fiamma
authors.initials: F
authors.lastname: Ronchetti
authors.forename: Antonio
authors.initials: A
authors.lastname: Scala
authors.forename: Bruna
authors.initials: B
authors.lastname: Bovio
mesh_terms: D000107:Acetylation; D018360:Crystallography, X-Ray; D008968:Molecular Conformation; D015394:Molecular Structure; D010084:Oxidation-Reduction; D011084:Polycyclic Aromatic Hydrocarbons / Q000737:chemistry*; D013256:Steroids / Q000737:chemistry*
chemical_list: D011084:Polycyclic Aromatic Hydrocarbons; D013256:Steroids