Methyl 4-O-pivaloyl-β-D-xylopyranoside

2006 ◽  
Vol 62 (7) ◽  
pp. o2746-o2748
Author(s):  
Vesna Petrović ◽  
Ivan Halasz ◽  
Srđanka Tomić ◽  
Dubravka Matković Čalogović
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
Hydroxyl Groups ◽  
Equatorial Position ◽  
Dimensional Chain ◽  
One Dimensional ◽  
Compound C

The six-membered ring of the title compound, C11H20O6, adopts the chair conformation, with the 4-O-pivaloyl group in an equatorial position. Two vicinal hydroxyl groups of each molecule form four hydrogen bonds of the O—H...O type in a one-dimensional chain running along the b axis.

scholarly journals Crystal structure of 7,7-dimethyl-6-methylidenetricyclo[6.2.1.01,5]undecane-2-carboxylic acid

2015 ◽  
Vol 71 (2) ◽  
pp. o94-o94
Author(s):  
Noureddine Beghidja ◽  
Samir Benayache ◽  
Fadila Benayache ◽  
David W. Knight ◽  
Benson M. Kariuki
Keyword(s):  
Crystal Structure ◽  
Carboxylic Acid ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Rotation Axis ◽  
Chair Conformation ◽  
Membered Ring ◽  
Envelope Conformation ◽  
Compound C ◽  
Carboxylic Groups

In the title compound, C15H22O2, both five-membered rings display an envelope conformation whereas the six-membered ring displays a chair conformation. In the crystal, pairs of O—H...O hydrogen bonds between carboxylic groups link molecules, related by a twofold rotation axis, into supramolecular dimers.

scholarly journals (7R,8S,8aS)-8-Hydroxy-7-phenylperhydroindolizin-3-one

2009 ◽  
Vol 65 (6) ◽  
pp. o1368-o1369
Author(s):  
Ľubomír Švorc ◽  
Viktor Vrábel ◽  
Štefan Marchalín ◽  
Peter Šafář ◽  
Jozef Kožíšek
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
Molecular Configuration ◽  
Compound C ◽  
The Absolute

In the title compound, C14H17NO2, the six-membered ring of the indolizine system adopts a chair conformation. In the crystal, molecules form chains parallel to thebaxisviaintermolecular O—H...O hydrogen bonds. The absolute molecular configuration was assigned from the synthesis.

scholarly journals Crystal structure of 2-amino-N-(2-fluorophenyl)-4,5,6,7-tetrahydro-1-benzothiophene-3-carboxamide

2015 ◽  
Vol 71 (11) ◽  
pp. o807-o808
Author(s):  
K. Chandra Kumar ◽  
V. Umesh ◽  
T. K. Madhura ◽  
B. M. Rajesh ◽  
Chandra
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Dihedral Angle ◽  
Title Compound ◽  
Molecular Conformation ◽  
Chair Conformation ◽  
Ring System ◽  
Membered Ring ◽  
Compound C

In the title compound, C15H15FN2OS, the dihedral angle between the planes of the benzothiophene ring system and the fluorobenzene ring is 3.74 (14)°. The six-membered ring of the benzothiophene moiety adopts a half-chair conformation. The molecular conformation is consolidated by intramolecular N—H...F and N—H...O hydrogen bonds. In the crystal, molecules are linked by N—H...O hydrogen bonds, generatingC(6) [001] chains.

scholarly journals 4,5-Diphenyl-2-p-tolyl-1H-imidazol-3-ium nitrate

2009 ◽  
Vol 65 (6) ◽  
pp. o1361-o1361
Author(s):  
Li-Jing Cui
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Dihedral Angles ◽  
Dimensional Chain ◽  
Aromatic Rings ◽  
One Dimensional ◽  
Compound C

In the cation of the title compound, C22H19N2+·NO3−, the N atom in the 3-position of the imidazole is protonated. The three pendant aromatic rings are twisted from the plane of the imadazolium ring by dihedral angles of 38.1 (1), 43.74 (9) and 20.4 (1)°. In the crystal structure, N—H...O and N—H...(O,O) hydrogen bonds link the molecules to form an infinite one-dimensional chain parallel to thecaxis.

scholarly journals 4-Benzyloxy-1-oxaspiro[4.6]undec-3-en-2-one

IUCrData ◽  
2016 ◽  
Vol 1 (10) ◽  
Author(s):  
Jose H. Quintana Mendoza ◽  
J. A. Henao ◽  
Elvis Robles Marin ◽  
Juan Manuel Urbina Gonzalez
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Phenyl Ring ◽  
Chair Conformation ◽  
Membered Ring ◽  
Compound C

The title compound, C17H20O3, the cycloheptane ring adopts a slightly distorted chair conformation. The planar five-membered ring is inclined at 57.13 (11)° to the phenyl ring of the benzyloxy substituent. In the crystal structure, C—H...O and C—H...π hydrogen bonds generate layers in the ac plane.

[1-(Benzylsulfonyl)-3-(4-nitrophenyl)-1,2,3,4-tetrahydroquinoxalin-2-yl](4-bromophenyl)methanone 2-methylpropanol hemisolvate

2007 ◽  
Vol 63 (3) ◽  
pp. o1372-o1374
Author(s):  
Oleg Ya. Borbulevych
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Axial Orientation ◽  
Equatorial Position ◽  
Centrosymmetric Dimer ◽  
Compound C ◽  
Π Stacking ◽  
Benzene Rings

In the title compound, C28H22BrN3O5S·0.5C4H10O, the tetrahydropyrazine ring adopts a distorted half-chair conformation. The bromobenzaldehyde substituent has an axial orientation, while the 4-nitrophenyl group is in an equatorial position. The benzene rings of these substituents are not parallel, but are partially involved in intramolecular π–π stacking. In the crystal structure, the methanone molecules form a centrosymmetric dimer via intermolecular N—H...O hydrogen bonds.

scholarly journals 1-Deacetoxy-1-oxocaesalmin

2014 ◽  
Vol 70 (6) ◽  
pp. o662-o662
Author(s):  
Juan Feng ◽  
Jian-Long Zhang ◽  
Rong-Rong Zhang ◽  
Li-Jun Ruan ◽  
Ren-Wang Jiang
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Furan Ring ◽  
Chair Conformation ◽  
Chain Structure ◽  
Membered Ring ◽  
Axis Direction ◽  
Compound C ◽  
A Chain

The title compound, C24H30O7, is a diterpenoid isolated from the seeds ofCaesalpinia minax. It consists of two cyclohexane rings (AandB), one unsaturated six-membered ring (C) and one furan ring (D). The stereochemistry of the ring junctures isA/B transandB/C trans. RingsAandBhave normal chair conformations whileCadopts a twisted half-chair conformation due to fusion to the furan ring which is planar [r.m.s. deviation = 0.0009 (2) Å]. In the crystal, hydroxyl O—H...Ocarbonylhydrogen bonds link the molecules into a chain structure extending along thea-axis direction.

scholarly journals Crystal structure of 4-(prop-2-ynyloxy)-2,2,6,6-tetramethylpiperidin-1-oxyl

2014 ◽  
Vol 70 (9) ◽  
pp. 130-133 ◽  
Author(s):  
Shailesh K. Goswami ◽  
Lyall R. Hanton ◽  
C. John McAdam ◽  
Stephen C. Moratti ◽  
Jim Simpson
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Three Dimensional ◽  
Chair Conformation ◽  
Membered Ring ◽  
Equatorial Orientation ◽  
Propargyl Bromide ◽  
Compound C ◽  
Dimensional Network

The title compound, C12H20NO2, was synthesized from 4-hydroxy-2,2,6,6-tetramethylpiperidin-1-oxyl (hydroxy-TEMPO) and propargyl bromide. The six-membered ring adopts a flattened chair conformation and carries a propynyloxy substituent in an equatorial orientation at the 4-position. The N—O bond length of the piperidin-1-oxyl unit is 1.289 (3) Å. In the crystal, C—H...O hydrogen bonds combine with unusual C—H...π interactions involving the alkyne unit as acceptor to generate a three-dimensional network.

(3aR,4R,4aS,9aR)-4-Hydroxyperhydrofuro[2,3-f]indolizin-7(2H)-one

2007 ◽  
Vol 63 (3) ◽  
pp. o1452-o1454 ◽  
Author(s):  
Ľubomír Švorc ◽  
Viktor Vrábel ◽  
Jozef Kožíšek ◽  
Štefan Marchalín ◽  
Jozefína Žúžiová
Keyword(s):  
Crystal Structure ◽  
Hydrogen Bonds ◽  
Title Compound ◽  
Chair Conformation ◽  
Membered Ring ◽  
Intermolecular Hydrogen Bonds ◽  
Compound C

In the title compound, C10H15NO3, the central six-membered ring has a chair conformation. The conformations of the fused furan and oxopyrrolidine rings are close to envelopes. Molecules form chains parallel to the a axis via O—H...O intermolecular hydrogen bonds, which help to stabilize the crystal structure.

scholarly journals 2,2′-(p-Phenylenedithio)diacetic acid

2009 ◽  
Vol 65 (6) ◽  
pp. o1206-o1206 ◽  
Author(s):  
Jian-Ling Yin ◽  
Yun-Long Feng
Keyword(s):  
Hydrogen Bonds ◽  
Title Compound ◽  
Dimensional Chain ◽  
Diacetic Acid ◽  
One Dimensional ◽  
Compound C

The complete molecule of the title compound, C10H10O4S2, is generated by a crystallographic inversion centre. In the crystal, molecules are linked into a one-dimensional chain by intermolecular O—H...O hydrogen bonds.

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