scholarly journals 5-O-tert-Butyldiphenylsilyl-2-C-hydroxymethyl-2,3-O-isopropylidene-2′-O-trifluoromethanesulfonyl-D-ribono-1,4-lactone

2007 ◽  
Vol 63 (3) ◽  
pp. o1088-o1090 ◽  
Author(s):  
Michela Simone ◽  
George W. J. Fleet ◽  
David J. Watkin
Keyword(s):  
Crystal Structure ◽  
Absolute Configuration ◽  
Title Compound ◽  
Starting Material ◽  
Compound C ◽  
The Absolute

The title compound, C26H31F3O8SSi, provides a unique example of the crystal structure of an organic trifluoromethanesulfonate attached to a primary C atom. The absolute configuration is determined by the use of D-ribose as the starting material.

(3R,4R)-(–)-3-Hydroxymethyl-4-phenyl-2-o-toluoyl-1,2,3,4-tetrahydroisoquinoline

2006 ◽  
Vol 62 (5) ◽  
pp. o1774-o1776 ◽  
Author(s):  
Andrzej Gzella ◽  
Maria Chrzanowska ◽  
Agnieszka Dreas ◽  
Michał S. Kaczmarek ◽  
Zenon Woźniak
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Phenyl Ring ◽  
Heterocyclic Ring ◽  
Hydroxymethyl Group ◽  
Envelope Conformation ◽  
Compound C ◽  
The Absolute

The absolute configuration of the title compound, C24H23NO2, has been confirmed as 3R,4R. The hydroxymethyl group and phenyl ring at the asymmetric C atoms exhibit α and β orientations, respectively, and the non-planar heterocyclic ring of the tetrahydroisoquinoline system adopts an envelope conformation. The crystal structure is stabilized through hydrogen bonds.

scholarly journals N-(2-Acetamido-2-deoxy-β-D-glucopyranosyl)-N-(3-azidopropyl)-O-methylhydroxylamine

2016 ◽  
Vol 72 (3) ◽  
pp. 340-342 ◽  
Author(s):  
Stefan Munneke ◽  
Bridget L. Stocker ◽  
Mattie S. M. Timmer ◽  
Graeme J. Gainsford
Keyword(s):  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Crystal Plate ◽  
Starting Material ◽  
Screw Axis ◽  
Compound C ◽  
The Absolute ◽  
Thin Crystal ◽  
Adequate Data

The structure of the title compound, C12H23N5O6, solved using adequate data from a thin crystal plate, confirmed that this useful glycoconjugate was obtained in the ring-closed β-pyranose configuration with4C1conformation. The molecules are bound by O—H...O(OH) hydrogen bonds, notably in a zigzagC(2) chain along the shortb(screw) axis, supplemented with anR22(12)O—H...O(carbonyl) link along theaaxis and otherC(2) links. The absolute configuration was not unambiguously determined but was known from the synthetic chemistry, which used natural 2-acetamido-2-deoxy-D-glucose as the starting material.

(3aS,5aR,6R,8aR)-3a-Hydroxy-5a-methyl-6-[(1R,2E,4R)-1,4,5-trimethyl-2-hexen-1-yl]-3a,4,5,5a,6,7,8,8a-octahydro-2H-cyclopenta[e]benzofuran-2-one

2007 ◽  
Vol 63 (11) ◽  
pp. o4196-o4196
Author(s):  
Wen-liang Wang ◽  
Hong-wen Tao ◽  
Wei Sun ◽  
Qian-Qun Gu ◽  
Wei-Ming Zhu
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Optical Rotation ◽  
Side Chain ◽  
Compound C ◽  
Extended Chain ◽  
Halotolerant Fungus ◽  
The Absolute

The title compound, C21H32O3, also known as dimethylincisterol A3, was isolated from halotolerant fungus THW-18. It is composed of three fused rings and a side chain. In the crystal structure, the molecules interact with each other via O—H...O hydrogen bonds, resulting in an extended chain along the b axis. The absolute configuration was assigned from the measured optical rotation and reference to the literature.

(1R,4S,8R,12S,13S,14R,16S,19R)-14-Hydroxy-7,7-dimethyl-17-methylene-2,9,18-trioxo-3,10-dioxapentacyclo[14.2.1.01,13.04,12.08,12]nonadec-19-yl acetate

2007 ◽  
Vol 63 (11) ◽  
pp. o4439-o4439
Author(s):  
Hao Shi
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Chair Conformation ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Compound C ◽  
Independent Molecules ◽  
The Absolute

The title compound, C22H26O8, prepared from the natural diterpenoid Macrocalyxin J, is built up from five fused rings. Cyclohenane ring A adopts a chair conformation, ring B exists in a screw-boat conformation and ring C adopts a boat conformation; the two five membered rings adopt envelope conformations. Two unique molecules are present in the asymmetric unit; both independent molecules have the same absolute configuration, the absolute configuration being deduced from the chirality of Macrocalyxin A, which was isolated from the same plant (i.e. Rabdosia macrocalyx) as Macrocalyxin J. The crystal structure displays intermolecular O—H...O hydrogen bonds.

scholarly journals Crystal structure of (1S,2R,4S)-1-[(morpholin-4-yl)methyl]-4-(prop-1-en-2-yl)cyclohexane-1,2-diol

2015 ◽  
Vol 71 (1) ◽  
pp. 79-81 ◽  
Author(s):  
Rachid Outouch ◽  
Saadia Oubaassine ◽  
Mustapha Ait Ali ◽  
Larbi El Firdoussi ◽  
Anke Spannenberg
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Chair Conformation ◽  
Asymmetric Unit ◽  
Compound C ◽  
Synthetic Procedure ◽  
Independent Molecules ◽  
The Absolute

The asymmetric unit of the title compound, C14H25NO3, contains two independent molecules with similar geometry. The morpholine and cyclohexane rings of both molecules adopt a chair conformation. Intramolecular O—H...N hydrogen bonds are observed. In the crystal, molecules are linked by O—H...O hydrogen bonds into chains parallel to the [101] direction. The chains are further connected through C—H...O hydrogen bonds forming undulating layers parallel to the (-101) plane. The absolute configuration was assigned by reference to an unchanging chiral centre in the synthetic procedure.

(+)-N-[(R)-1-(2-Hydroxy-5-methylphenyl)propyl]-N-[(R)-2-methyl-1-phenylpropyl]ammonium chloride

2006 ◽  
Vol 62 (7) ◽  
pp. o2622-o2624 ◽  
Author(s):  
Xiao-Feng Yang ◽  
Da-Qi Wang ◽  
Guang-You Zhang ◽  
Takuji Hirose
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonding ◽  
Hydrogen Bonds ◽  
Ammonium Chloride ◽  
Absolute Configuration ◽  
Title Compound ◽  
Condensation Reaction ◽  
Compound C ◽  
The Absolute ◽  
Phenol Ring

The title compound, C20H28NO+·Cl−, was synthesized by a condensation reaction. The absolute configuration of the new stereogenic centre (the C atom between the N atom and the phenol ring) was determined as R. The crystal structure is stabilized through N—H...Cl and O—H...Cl hydrogen bonds and intramolecular N—H...O hydrogen bonding.

(1′S,2′S,5′R)-3-(2-Bromopropionyl)-2′-isopropyl-5′-methylspiro[2H-1,3-benzoxazine-2,1′-cyclohexan]-4(3H)-one

2006 ◽  
Vol 62 (7) ◽  
pp. o3011-o3012 ◽  
Author(s):  
Qing Yuan ◽  
Ming Lei
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Anomalous Scattering ◽  
Compound C ◽  
Scattering Effects ◽  
The Absolute

The absolute configuration of the title compound, C20H26BrNO3, was determined from both the synthetic precursor and anomalous scattering effects. In the crystal structure, non-classical C—H...O hydrogen bonds link the molecules into a sheet parallel to the b axis.

scholarly journals Crystal structure of (E)-2-[(2S,5R)-2-isopropyl-5-methylcyclohexylidene]hydrazine-1-carbothioamide

2014 ◽  
Vol 70 (9) ◽  
pp. o903-o904 ◽  
Author(s):  
Adriano Bof de Oliveira ◽  
Johannes Beck ◽  
Jörg Daniels ◽  
Renan Lira de Farias ◽  
Adelino Vieira de Godoy Netto
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Torsion Angle ◽  
Title Compound ◽  
Chair Conformation ◽  
Starting Material ◽  
Cyclohexane Ring ◽  
Compound C ◽  
The Absolute ◽  
Absolute Structure

The title compound, C11H21N3S, consists of a menthone moiety attached to an extended thiosemicarbazone group with the N—N—C—N torsion angle being 11.92 (16)°. The cyclohexane ring has a chair conformation and the conformation about the C=N bond isE. In the crystal, molecules are linkedviapairs of N—H...S hydrogen bonds, forming chains along theaaxis. The absolute structure could be assigned with reference to the starting material,i.e.enantiopure (−)-menthone [Flack parameter = 0.05 (5)].

Crystal structure of camphor-1,4-homoenol p-bromobenzoate

1980 ◽  
Vol 58 (24) ◽  
pp. 2805-2807 ◽  
Author(s):  
Richard A. Pauptit ◽  
James Trotter
Keyword(s):  
Crystal Structure ◽  
Absolute Configuration ◽  
Title Compound ◽  
Membered Ring ◽  
Fourier Methods ◽  
Bond Angles ◽  
Compound C ◽  
The Absolute ◽  
Considerable Strain

Crystals of the title compound, C17H19BrO2, are orthorhombic, P212121, a = 6.875(1), b = 8.522(2), c = 26.658(6) Å, Z = 4. The structure was determined by Patterson and Fourier methods, and refined to R = 0.045 for 697 reflections with I ≥ 3σ(I); the absolute configuration was established. The four-membered ring is tightly folded, and bond angles in the vicinity of this ring indicate considerable strain.

scholarly journals Crystal structure of methyl (2R,3S)-3-[(tert-butylsulfinyl)amino]-2-fluoro-3-phenylpropanoate

2015 ◽  
Vol 71 (12) ◽  
pp. o1055-o1056
Author(s):  
Zhiwei Zhao ◽  
Wenqiang Fan ◽  
Yixiang Zhang ◽  
Ya Li
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Axis Direction ◽  
Compound C ◽  
Chiral Carbon ◽  
The Absolute

The title compound, C14H20FNO3S, contains two chiral carbon centres and the absolute configuration has been confirmed as (2R,3S). In the crystal, adjacent molecules are linked by weak C—H...O hydrogen bonds, generating zigzag chains along thea-axis direction.

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