0000000000382832
AUTHOR
Angela Tuzi
Crystal structure of a new spiro-polytetrahydrofuran compound with translational pseudosymmetry: rac-(2S,2′S,5′R)-2-methyl-5′-[(1R,2R,5S,5′R)-1,4,4,5′-tetramethyldihydro-3′H-3,8-dioxaspiro[bicyclo[3.2.1]octane-2,2′-furan]-5′-yl]hexahydro[2,2′-bifuran]-5(2H)-one
The title compound, C22H34O6, is a product of oxidation of squalene with the catalytic system RuO4(cat.)/NaIO4. The asymmetric unit contains two crystallographically independent molecules of very similar geometry approximately related by the non-crystallographic translation vector c/2. As a consequence, the average diffracted intensity in the hkl layers with odd l is systematically lower than in the layers with even l. In one molecule, the lactone ring and part of the adjacent tetrahydrofuran ring are disordered over two orientations with refined occupancy ratio of 0.831 (10):0.169 (10). The crystal structure is mainly governed by van der Waals forces.
{2-[2,2-Bis(4,4-dimethyl-4,5-dihydro-1,3-oxazol-2-yl- κN)propyl]pyridine}dichloridoiron(II)
The title compound,[FeCl2(C18H25N3O2)], has a distorted tetra-hedral Cl2N2 coordination of the Fe(II) atom as a result of the constraints imposed by the 2-[2,2-bis-(4,4-dimethyl-4,5-di-hydro-1,3-oxazol-2-yl)prop-yl]pyridine ligand. The pyridine ring is almost perpendicular to the six-membered chelated ring containing the metal atom [dihedral angle between their mean planes = 88.5 (1)°].
Syntheses and characterization of novel ruthenium complexes based on 1,3-dicyanobenzene
Submitted by António Freitas (amsf@uma.pt) on 2019-06-14T13:25:52Z No. of bitstreams: 1 Syntheses and Characterization of Novel Ruthenium Complexes Based on 13-DicyanobenzeneJoãoRodrigues.pdf: 354444 bytes, checksum: edc8aaaa84900d75321648e76e0c8e27 (MD5) Made available in DSpace on 2019-06-14T13:25:52Z (GMT). No. of bitstreams: 1 Syntheses and Characterization of Novel Ruthenium Complexes Based on 13-DicyanobenzeneJoãoRodrigues.pdf: 354444 bytes, checksum: edc8aaaa84900d75321648e76e0c8e27 (MD5) Previous issue date: 2007 info:eu-repo/semantics/publishedVersion
Crystal structure of an epoxysterol: 9α,11α-epoxy-5α-cholest-7-ene-3β,5,6α-triol 3,6-diacetate
The title compound is a polyoxygenated epoxy steroid that crystallizes in the P212121 space group.