scholarly journals (1S,2R,3S,6S,7R)-3,7,11,11-Tetramethyl-6,7-epoxybicyclo[5.4.0]undecane-2-ol

2014 ◽  
Vol 70 (5) ◽  
pp. o595-o595
Author(s):  
Mohamed Loubidi ◽  
Ahmed Benharref ◽  
Lahcen El Ammari ◽  
Mohamed Saadi ◽  
Moha Berraho
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Boat Conformation ◽  
Axis Direction ◽  
Cedrus Atlantica ◽  
Compound C ◽  
Twist Boat

The title compound, C15H26O2, was synthesized from β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from the Atlas cedar (cedrus atlantica). The molecule is built up from a seven-membered ring to which a six- and a three-membered ring are fused. The seven- and six-membered rings each have a twist-boat conformation. In the crystal, O—H...O hydrogen bonds link the molecules into zigzag chains running along theb-axis direction.

scholarly journals (1S,2R,8R)-11-Amino-2,2-dichloro-3,7,7,10-tetramethyltricyclo[6.4.0.01,3]dodec-10-en-9-one

IUCrData ◽  
2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Mustapha Ait Elhad ◽  
Ahmed Benharref ◽  
Lahcen El Ammari ◽  
Mohamed Saadi ◽  
Abdelouahd Oukhrib ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Monoclinic Space Group ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Space Group ◽  
Axis Direction ◽  
Compound C ◽  
Independent Molecules

The title compound, C16H23Cl2NO, crystallizes in the monoclinic space groupP21with two independent molecules (AandB) in the asymmetric unit. They have essentially the same conformation. Each molecule is built up from fused six- and seven-membered rings and an additional three-membered ring. The six-membered ring has an envelope conformation, with the C atom belonging to the three-membered ring forming the flap, while the seven-membered ring displays a boat conformation. In the crystal, molecules are linked into chains propagating along thea-axis direction by N—H...O hydrogen bonds.

scholarly journals Ethyl 2,6-bis(4-chlorophenyl)-1-isocyano-4-oxocyclohexanecarboxylate

2014 ◽  
Vol 70 (7) ◽  
pp. o802-o802
Author(s):  
Dawei Zhang ◽  
Peng Yang ◽  
Wei Liu ◽  
Jing Li
Keyword(s):  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Membered Ring ◽  
Boat Conformation ◽  
Equatorial Position ◽  
Aryl Group ◽  
Compound C ◽  
Twist Boat

In the title compound, C22H19Cl2NO3, the central six-membered ring is in a twist-boat conformation. The two aryl groups are in equatorial positions,transto each other and with a dihedral angle of 77.50 (2)° between them. One of the least hindered –CH2– groups and one of the aryl-substituted C atoms, with its axial H atom, are in the flagpole positions. The ethoxycarbonyl group is in an equatorial position and iscisto the second aryl group. In the crystal, molecules are linkedviaweak C—H...O hydrogen bonds, forming chains along [010].

scholarly journals exo-1,7-Dimethyl-4-phenyl-10-oxa-4-azatricyclo[5.2.1.02,6]dec-8-ene-3,5-dione

2013 ◽  
Vol 69 (12) ◽  
pp. o1756-o1756
Author(s):  
Armando Pineda-Contreras ◽  
Oscar Fernando Vázquez-Vuelvas ◽  
Laura Edith Negrete-López ◽  
Héctor García-Ortega ◽  
Marcos Flores-Alamo
Keyword(s):  
Double Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Boat Conformation ◽  
Two Dimensional ◽  
Pyrrolidine Ring ◽  
Axis Direction ◽  
Π Interactions ◽  
Compound C

The title compound, C16H15NO3, consists of an oxabicycle fused to anN-phenyl-substituted pyrrolidine ringantito the double bond, affording theexoisomer. In the oxabicycle system, the six-membered ring presents a boat conformation, while the heterocyclic rings show envelope conformations with the O atom projected out of the plane. In the crystal, adjacent molecules are linkedviaweak C—H...O hydrogen bonds, forming chains propagating along thea-axis direction. The chains are linked by C—H...π interactions, forming two-dimensional networks lying parallel to theacplane.

scholarly journals 1-Ethyl-4-phenyl-1,5-benzodiazepine-2-thione

IUCrData ◽  
2017 ◽  
Vol 2 (1) ◽  
Author(s):  
Lhoussaine El Ghayati ◽  
Noureddine Hamou Ahabchane ◽  
Mohamadou Lamine Doumbia ◽  
Nada Kheira Sebbar ◽  
El Mokhtar Essassi ◽  
...  
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Boat Conformation ◽  
Aromatic Rings ◽  
Axis Direction ◽  
Compound C ◽  
Two Component

In the title compound, C17H16N2S, the seven-membered ring adopts a boat conformation. The two aromatic rings are inclined at an angle of 34.7 (1)° to one another. The molecules pack in helical chains running along thec-axis direction through C—H...S hydrogen bonds. These are further linked into layers parallel to (100) by weak C—H...π(ring) interactions. The structure was refined as a two-component inversion twin.

scholarly journals (4Z)-4-(2-Oxopropylidene)-2,3,4,5-tetrahydro-1H-1,5-benzodiazepin-2-one

IUCrData ◽  
2017 ◽  
Vol 2 (7) ◽  
Author(s):  
Jihad Sebhaoui ◽  
Youness El Bakri ◽  
El Mokhtar Essassi ◽  
Joel T. Mague
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Boat Conformation ◽  
Axis Direction ◽  
Compound C

In the title compound, C12H12N2O2, the seven-membered ring adopts a boat conformation. The orientation of the acetyl substituent on this ring is partly determined by an intramolecular N—H...O hydrogen bond. In the crystal, wrinkled sheets stacked along the a-axis direction are formed by pairwise N—H...O and C—H...O hydrogen bonds. The sheets are connected through additional N—H...O and C—H...O hydrogen bonds stacking the molecules along the a-axis direction. The structure was refined as a three-component twin.

scholarly journals (1R,2R,7S,8R,9R)-N-(2-Hydroxy-2,6,6,9-tetramethyl-12-oxatricyclo[7.2.1.01,7]dodecan-8-yl)acetamide

IUCrData ◽  
2017 ◽  
Vol 2 (7) ◽  
Author(s):  
Amed Benharref ◽  
Mustapha Ait Elhad ◽  
Noureddine Mazoir ◽  
Jean-Claude Daran ◽  
Abdelouahd Oukhrib ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Cedrus Atlantica ◽  
Compound C ◽  
Independent Molecules

The title compound, C17H29NO3, was synthesized in two steps from β-himachalene (2,6,6,9-tetramethylbicyclo[5.4.01,7]undeca-1,8-diene), which was isolated from an oil of the Atlas cedar (Cedrus Atlantica). The asymmetric unit contains two independent molecules (A and B): B features an intramolecular O—H...O hydrogen bond whereas A forms an intermolecular O—H...O link to B. Each molecule is built up from a seven-membered ring to which a bridged six-membered ring is fused: the cycloheptane rings have twist-chair conformations, while the bridged cyclohexane rings display near-perfect boat conformations. In the crystal, the molecules are linked by N—H...O and O—H...O hydrogen bonds forming helical chains propagating along the b-axis direction. Some weak C—H...O interactions are also observed.

scholarly journals 4-(4-Methoxyphenyl)-5,7-dimethylchroman-2-one

IUCrData ◽  
2016 ◽  
Vol 1 (3) ◽  
Author(s):  
Jaqueline Evangelista Queiroz ◽  
Giuliana Muniz Vila Verde ◽  
Mariette Miguens Pereira ◽  
Manuela Ramos Silva ◽  
Gilberto L. B. Aquino
Keyword(s):  
Hydrogen Bonds ◽  
Benzene Ring ◽  
Title Compound ◽  
Boat Conformation ◽  
Pyran Ring ◽  
Axis Direction ◽  
Π Interactions ◽  
Microwave Assisted ◽  
Compound C ◽  
The Mean

In the title compound, C18H18O3, a dihydrocoumarin synthesizedviaa microwave-assisted hydroarylation reaction, the 4-methoxyphenyl ring is inclined to the mean plane of the coumarin moiety by 78.21 (9)°. The pyran ring has a screw-boat conformation and its mean plane is inclined to the fused benzene ring by 13.88 (11)°. In the crystal, molecules are linkedviaC—H...O hydrogen bonds, forming ribbons along theb-axis direction. The ribbons are linkedviaC—H...π interactions, forming slabs parallel to theabplane.

scholarly journals Crystal structure of tetraethyl 27,30-dioxo-7,12,20,25-tetra-tert-butyl-3,16-dioxa-9,22,28,31-tetrathiaheptacyclo[21.3.1.11,5.14,8.110,14.114,18.117,21]dotriaconta-4,6,8(29),10,12,17,19,21(32),23,25-decaene-2,2,15,15-tetracarboxylate

2015 ◽  
Vol 71 (10) ◽  
pp. o778-o779
Author(s):  
Mehmet Akkurt ◽  
Jerry P. Jasinski ◽  
Shaaban K. Mohamed ◽  
Omran A. Omran ◽  
Mustafa R. Albayati
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Asymmetric Unit ◽  
Axis Direction ◽  
Tert Butyl ◽  
Envelope Conformation ◽  
Compound C ◽  
A Chain

The asymmetric unit of the title compound, C54H64O12S4, consists of one half of the molecule, which is located on an inversion centre. The heterocyclic six-membered ring adopts a distorted envelope conformation with the spiro C atom as the flap. In the crystal, molecules are linked by weak C—H...O hydrogen bonds with anR22(14) motif, forming a chain along theb-axis direction.

scholarly journals (Z)-3-Benzyl-1,5-benzothiazepin-4(5H)-one

2012 ◽  
Vol 68 (8) ◽  
pp. o2329-o2329
Author(s):  
V. Sabari ◽  
R. Selvakumar ◽  
M. Bakthadoss ◽  
S. Aravindhan
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Membered Ring ◽  
Boat Conformation ◽  
Compound C

In the crystal structure of the title compound, C16H13NOS, molecules are linked into cyclic centrosymmetricR22(8) dimersviapairs of N—H...O hydrogen bonds. The seven-membered ring adopts a boat conformation.

scholarly journals (1R,4R,6S,7R)-5,5-Dibromo-1,4,8,8-tetramethyltricyclo[5.4.1.04,6]dodecan-12-one

2014 ◽  
Vol 70 (5) ◽  
pp. o526-o526 ◽  
Author(s):  
Mohamed Zaki ◽  
Ahmed Benharref ◽  
Jean-Claude Daran ◽  
Moha Berraho
Keyword(s):  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
The Other ◽  
Boat Conformation ◽  
Asymmetric Unit ◽  
Cedrus Atlantica ◽  
Compound C ◽  
Independent Molecules

The title compound, C16H24Br2O, was synthesized from the reaction of β-himachalene (3,5,5,9-tetramethyl-2,4a,5,6,7,8-hexahydro-1H-benzocycloheptene), which was isolated from Atlas cedar (Cedrus atlantica). The asymmetric unit contains two independent molecules with similar conformations. Each molecule is built up from two fused seven-membered rings and an additional three-membered ring. In both molecules, one of the seven-membered rings has a chair conformation, whereas the other displays a screw-boat conformation.

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