scholarly journals Crystal structure of a bioactive sesquiterpene isolated fromArtemisia reticulata

2016 ◽  
Vol 72 (4) ◽  
pp. 460-462
Author(s):  
A. K. Bauri ◽  
Sabine Foro ◽  
Nhu Quynh Nguyen Do
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Hydrogen Bonds ◽  
Silica Gel ◽  
Title Compound ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Exocyclic Double Bond ◽  
Compound C ◽  
Cyclopentane Ring

The title compound, C15H24O2{systematic name: 1-[6-hydroxy-7-(propan-2-yl)-4-methylidene-2,3,3a,4,5,6,7,7a-octahydro-1H-inden-1-yl]ethanone} was isolated fromA. reticulataby column chromatography over silica gel by gradient solvent elution. The molecule comprises a bicyclo[4.3.0]nonane ring bearing acetoxy, hydroxy and isopropyl substituents, and an exocyclic double bond on the cyclohexane ring. In the bicyclic skeleton, the cyclohexane ring adopts a chair conformation ring and the cyclopentane ring is in an envelope conformation. In the crystal, molecules are linked by O—H...O hydrogen bonds, forming chains along [010]. These chains are cross-linked by C—H...O hydrogen bonds.

scholarly journals Crystal structure of (E)-2-[3-(tert-butyl)-2-hydroxybenzylidene]-N-cyclohexylhydrazine-1-carbothioamide

2018 ◽  
Vol 74 (10) ◽  
pp. 1460-1462 ◽  
Author(s):  
Md. Azharul Arafath ◽  
Huey Chong Kwong ◽  
Farook Adam ◽  
Mohd. R. Razali
Keyword(s):  
Crystal Structure ◽  
Double Bond ◽  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Compound C ◽  
Similar Conformation ◽  
Ring Motif

In the title compound, C18H27N3OS, the cyclohexane ring has a chair conformation. The azomethine C=N double bond has an E configuration. The nearly planar hydrazinecarbothioamide moiety and substituted benzene ring are twisted by 31.13 (5)° relative to each other. The amide moiety and the cyclohexane ring are almost perpendicular to each other; a similar conformation was previously observed in reported structures. In the crystal, molecules are linked by N—H...S hydrogen bonds, forming inversion dimers with an R 2 2(8) ring motif.

scholarly journals Crystal structure of racemic [(1R,2S,3R,4S,6S)-2,6-bis(furan-2-yl)-4-hydroxy-4-(thiophen-2-yl)cyclohexane-1,3-diyl]bis(thiophen-2-ylmethanone)

2016 ◽  
Vol 72 (7) ◽  
pp. 976-979 ◽  
Author(s):  
Ísmail Çelik ◽  
Cem Cüneyt Ersanlı ◽  
Mehmet Akkurt ◽  
Hayrettin Gezegen ◽  
Rahmi Köseoğlu
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Hydroxy Group ◽  
Title Compound ◽  
Furan Ring ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Π Interactions ◽  
Compound C

In the title compound, C28H22O5S3, the central cyclohexane ring adopts a chair conformation. The atoms of the furan ring attached to the 6-position of the central cyclohexane ring are disordered over two sets of sites with occupancies of 0.832 (5) and 0.168 (5). The hydroxy group is disordered over two positions (at the 4- and 6-positions of the cyclohexane ring) in the ratio 0.832 (5):0.168 (5). In the crystal, molecules are linked by C—H...O hydrogen bonds and C—H...π interactions, forming layers parallel to (100).

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)].

scholarly journals Crystal structure of {[2-hydroxy-2-(3-methoxyphenyl)cyclohexyl]methyl}dimethylammonium benzoate

2015 ◽  
Vol 71 (11) ◽  
pp. o864-o865 ◽  
Author(s):  
S. N. Sheshadri ◽  
P. Nagendra ◽  
B. P. Siddaraju ◽  
K. H. Hemakumar ◽  
K. Byrappa ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Compound C ◽  
Cyclohexyl Methyl

The title compound, C16H26NO2+·C7H5O2−, is a benzoate salt of the painkiller Tramadol. The six-membered cyclohexane ring of the cation adopts a slightly distorted chair conformation and carries OH and 3-methoxyphenyl substituents at the 2-position and a protonated methylazaniumylmethyl group at the 3-position. In addition, a weak intramolecular C—H...O hydrogen bond is observed in the cation. In the crystal, weak O—H...O, N—H...O and C—H...O hydrogen bonds link the components into chains along [010]. A C—H...π contact is also observed.

3,7-Dichloro-3,7-diphenylbenzo[1,2-c;4,5-c′]difuran-1,5(3H,7H)-dione cyclohexane 0.25-solvate

2006 ◽  
Vol 62 (7) ◽  
pp. o3099-o3100
Author(s):  
Shan Liu ◽  
Jing-Ning Liu ◽  
Guang-Liang Song ◽  
Ya-Ming Wu ◽  
Hong-Jun Zhu
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Site Symmetry ◽  
Asymmetric Unit ◽  
Compound C

In the main molecule of the title compound, C22H12Cl2O4·0.25C6H12, the rings are planar. The asymmetric unit contains only one-half of a half-occupancy cyclohexane ring (site symmetry 111) and has a distorted chair conformation. Intramolecular C—H...Cl and C—H...O hydrogen bonds may be effective in the stabilization of the crystal structure.

scholarly journals Crystal structure of diethyl 2,2′-[((1E,1′E)-{[(1R,4R)-cyclohexane-1,4-diyl]bis(azanylylidene)}bis(methanylylidene))bis(1H-pyrrole-2,1-diyl)]diacetate

2015 ◽  
Vol 71 (3) ◽  
pp. o165-o166
Author(s):  
Jasim Alshawi ◽  
Muoayed Yousif ◽  
Karzan H. Zangana ◽  
Inigo J. Vitorica Yrezabal ◽  
Richard Winpenny ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Ethyl Acetate ◽  
Title Compound ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Inversion Symmetry ◽  
Compound C

The whole molecule of the title compound, C24H32N4O4, is generated by inversion symmetry. The cyclohexane ring adopts a chair conformation and the conformation about the C=N bonds isE. The pyrrole rings have ananticonfirmation with respect to the cyclohexane moiety and the ethyl acetate groups have extended conformations. In the crystal, molecules are linked by pairs of C—H...O hydrogen bonds forming chains, enclosingR22(10) ring motifs with inversion symmetry, propagating parallel to the (101) plane.

scholarly journals Crystal structure of (1S,2S,2′R,3a′S,5R)-2′-[(5-bromo-1H-indol-3-yl)methyl]-2-isopropyl-5,5′-dimethyldihydro-2′H-spiro[cyclohexane-1,6′-imidazo[1,5-b]isoxazol]-4′(5′H)-one

2016 ◽  
Vol 72 (8) ◽  
pp. 1081-1084
Author(s):  
Siwar Ghannay ◽  
Jihed Brahmi ◽  
Soumaya Nasri ◽  
Kaïss Aouadi ◽  
Erwann Jeanneau ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Absolute Configuration ◽  
Title Compound ◽  
Chair Conformation ◽  
Cyclohexane Ring ◽  
Compound C ◽  
The Absolute

In the title compound, C24H32BrN3O2, the six-membered cyclohexane ring adopts a chair conformation and the isoxasolidine ring adopts a twisted conformation. The molecule has five chiral centres and the absolute configuration has been determined in this analysis. The molecular structure is stabilized by weak intramolecular C—H...O and C—H...N contacts. In the crystal, molecules are linked by N—H...N and C—H...O hydrogen bonds, forming undulating sheets parallel to thebcplane.

1,2,13,14,14a,15,16,17,18,18a-Decahydro-1,14-methano-4H,6H,8H-1,3,5-oxadiazino[3′,4′:3,3a]benzimidazo[1,7a-b][2,4]benzodiazepine-6,19-dione

2007 ◽  
Vol 63 (11) ◽  
pp. o4440-o4440
Author(s):  
Nengfang She ◽  
Hailing Xi
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
Cyclohexane Ring ◽  
Boat Conformation ◽  
Compound C

In the title compound, C18H20N4O3, a glycoluril derivative, the oxadiazinane six-membered ring displays a chair conformation and the bridgehead cyclohexane ring a boat conformation. In the crystal structure, intermolecular C—H...O hydrogen bonds may help to establish the packing.

scholarly journals Crystal structure of 2-benzylamino-4-p-tolyl-6,7-dihydro-5H-cyclopenta[b]pyridine-3-carbonitrile

2015 ◽  
Vol 71 (2) ◽  
pp. 192-194
Author(s):  
R. A. Nagalakshmi ◽  
J. Suresh ◽  
S. Maharani ◽  
R. Ranjith Kumar ◽  
P. L. Nilantha Lakshman
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Pyridine Ring ◽  
Three Dimensional ◽  
Π Interactions ◽  
Compound C ◽  
Centroid Distance ◽  
Cyclopentane Ring ◽  
Ring Motif

The title compound, C23H21N3, comprises a 2-amino-3-cyanopyridine ring fused with a cyclopentane ring. The later adopts an envelope conformation with the central methylene C atom as the flap. The benzyl and andp-tolyl rings are inclined to one another by 56.18 (15)°, and to the pyridine ring by 81.87 (14) and 47.60 (11)°, respectively. In the crystal, molecules are linked by pairs of N—H...Nnitrilehydrogen bonds, forming inversion dimers with anR22(12) ring motif. The dimers are linked by C—H...π and π–π interactions [centroid–centroid distance = 3.7211 (12) Å], forming a three-dimensional framework.

scholarly journals Crystal structure ofcis-1-(2-methyl-1,2,3,4-tetrahydroquinolin-4-yl)azepan-2-one

2014 ◽  
Vol 70 (9) ◽  
pp. o981-o982 ◽  
Author(s):  
P. S. Pradeep ◽  
S. Naveen ◽  
M. N. Kumara ◽  
K. M. Mahadevan ◽  
N. K. Lokanath
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Compound C ◽  
Supramolecular Chains

In the title compound, C16H22N2O, the azepan-2-one ring adopts a chair conformation, while the 1,2,3,4-tetrahydropyridine ring adopts a half-chair conformation. In the crystal, molecules are linked by N—H...O hydrogen bonds, forming supramolecular chains propagated along [10-1], with weak C—H...O interactions occurring between the chains.

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