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.

(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.

(4S,1′R)-Diethyl 6-methyl-2-[(1′-phenylethylimino)methyl]-4-(2-thienyl)-1,4-dihydropyridine-3,5-dicarboxylate

2006 ◽  
Vol 62 (7) ◽  
pp. o2759-o2761
Author(s):  
Viktor Vrábel ◽  
Pavol Skubák ◽  
Štefan Marchalín ◽  
Vratislav Langer ◽  
Barbora Baumlová
Keyword(s):  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Thiophene Ring ◽  
Boat Conformation ◽  
Compound C ◽  
The Absolute

The absolute configuration of the title compound, C25H28N2O4S, has been determined. The molecules are interconnected by weak C—H...O hydrogen bonds. The 1,4-dihydropyridine (1,4-DHP) ring adopts the usual shallow boat conformation. The thiophene ring is nearly planar.

(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 5α-Hydroxyeudesm-4(15),11(13)-dien-8β,12-olide

2012 ◽  
Vol 68 (4) ◽  
pp. o1208-o1208 ◽  
Author(s):  
Xue Gao ◽  
Gang Chen
Keyword(s):  
Hydrogen Bonds ◽  
Sesquiterpene Lactone ◽  
Absolute Configuration ◽  
Title Compound ◽  
Aerial Parts ◽  
Compound C ◽  
Ring Junction ◽  
Twist Conformation ◽  
Cyclopentane Ring ◽  
The Absolute

The title compound, C15H20O3, a sesquiterpene lactone, was isolated from the aerial parts ofCarpesium minusHemsl. (Compositae). The molecule is composed of three rings, with the two cyclohexane rings in chair conformations and the cyclopentane ring adopting a twist conformation. TheA/Bring junction istrans-fused. The absolute configuration shown has been arbitrarily assigned. In the crystal, molecules are linked into [100] chains by 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 (S)-N-Phenyl-tert-butanesulfinamide

2012 ◽  
Vol 68 (6) ◽  
pp. o1728-o1728
Author(s):  
Xiaofei Sun ◽  
Xiaoping Zhang ◽  
Binbin Zhang ◽  
Wenguo Wang ◽  
Qingle Zeng
Keyword(s):  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Parent Compound ◽  
Asymmetric Unit ◽  
Compound C ◽  
Independent Molecules ◽  
The Absolute

The asymmetric unit of the title compound, C10H15NOS, contains two independent molecules with similar conformations. In the crystal, molecules are linked in a head-to-tail fashion by N—H...O hydrogen bonds into chains running along the b axis. The absolute configuration was assigned on the basis of known chirality of the parent compound.

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)].

Sign in / Sign up

Export Citation Format

Share Document