oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
(5SR,10SR,15SR)-Trimethyl 5H,10H,15H-diindeno[1,2-a:1′,2′-c]fluorene-5,10,15-tricarboxylate 0.167-hydrate
Melissa C. Menard,Frank R. Fronczek,Steven F. Watkins,Raj K. Dhar
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810049056
Abstract: The title compound, C33H24O6·0.17H2O, which is commonly known as (SR,SR,SR)-trimethyl 1,10,19-truxentricarboxylate, crystallizes as a hydrate with the water molecule encapsulated between three ester groups by O—H...O hydrogen bonding to two of them. The water molecule site is not fully occupied in the crystal studied, with a refined site occupancy of 0.167 (5). The 27-atom ring system is approximately planar, with a maximum deviation of 0.148 (1) , and the three ester substituents are all on the same side of this plane.
1-(4-Chloro-3-fluorophenyl)-2-[(3-phenylisoquinolin-1-yl)sulfanyl]ethanone
P. Manivel,Venkatesha R. Hathwar,T. Maiyalagan,N. Burcu Arslan
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809001573
Abstract: In the title compound, C23H15ClFNOS, the isoquinoline system and the 4-chloro-3-fluorophenyl ring are aligned at 80.4 (1)°. The dihedral angle between the isoquinoline system and the pendant (unsubstituted) phenyl ring is 19.91 (1)°.
Trimethyl 4,6-Dicyano-5-hydroxybenzene-1,2,3-tricarboxylate  [PDF]
Afsaneh Zonouzi,Roghieh Mirzazadeh,Seik Weng Ng
Molbank , 2012, DOI: 10.3390/M775
Abstract: A novel synthesis of a fully substituted fluorescent phenol by a one-pot reaction of dimethyl acetylendicarboxylate and malononitrile in the presence of catalysts has been developed. The structure of the synthesized compound was assigned on the basis of its elemental analysis, 1H-NMR, 13C-NMR, IR, mass spectral and X-ray data. The photophysical data of the new compound are reported.
2,2-Diethyl 4-methyl 5-(4-nitrophenyl)-4-phenylpyrrolidine-2,2,4-tricarboxylate  [cached]
Long He
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811036038
Abstract: The title compound, C24H26N2O8, was synthesized by the cycloaddition reaction of methyl 2-phenylacrylate, diethyl 2-aminomalonate and 4-nitrobenzaldehyde. The pyrrolidine ring exhibits an envelope conformation. The two benzene rings are located on opposite sides of the pyrrolidine ring and subtend a dihedral angle of 59.16 (14)°. The crystal packing is stabilized by N—H...O and weak C—H...O hydrogen bonding.
Chlorido(2-iminomethyl-3-fluorophenyl-κ2C1,N)tris(trimethylphosphane-κP)iron  [cached]
Xiaofeng Xu,Xiaoyan Li
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811015030
Abstract: The title compound, [Fe(C7H5FN)Cl(C3H9P)3], was obtained as a product of the reaction of [Fe(Me3P)4] with a molar equivalent of (2-chloro-6-fluorophenyl)methanimine in diethyl ether. This compound is sensitive to air, and rapidly decomposes when exposed to air for a few minutes. The Fe atom has an octahedral coordination geometry in which the bidentate fluorophenyl methanimine ligand forms the equatorial plane with the Cl atom and one of the trimethylphosphane ligands. The other two trimethylphosphane ligands are located in the axial positions. In the crystal, an N—H...Cl hydrogen bond occurs.
One-Pot Synthesis of 2,3,4-Triarylquinolines via Suzuki-Miyaura Cross-Coupling of 2-Aryl-4-chloro-3-iodoquinolines with Arylboronic Acids  [PDF]
Malose Jack Mphahlele,Mamasegare Mabel Mphahlele
Molecules , 2010, DOI: 10.3390/molecules15107423
Abstract: Palladium–catalyzed Suzuki cross-coupling of 2-aryl-4-chloro-3-iodoquinolines with excess arylboronic acids (2.5 equiv.) in the presence of tricyclohexylphosphine afforded the 2,3,4-triarylquinolines in one-pot operation. The incipient 2,3-diaryl-4-chloroquinolines were also prepared and transformed to the primary 4-amino-2,3-diarylquinolines and 2,3-diarylquinolin-4(1H)-ones.
Templated Formation of Hydroxyapatite Nanoparticles from Self-Assembled Nanogels Containing Tricarboxylate Groups  [PDF]
Yoshihiro Sasaki,Setsuko Yamane,Kei Kurosu,Shin-Ichi Sawada,Kazunari Akiyoshi
Polymers , 2012, DOI: 10.3390/polym4021056
Abstract: Nanosized hydroxyapatite (HAp) materials have received much attention in the context of their advanced biomedical applications, including tissue engineering and drug delivery systems. Hybridization of nanosized HAp with organic molecules is a promising approach to facilitate the preparation of HAp nanomaterials. Here, templated mineralization using self-assembled nanogels modified with tricarboxylate groups was performed to yield the hybrid HAp nanomaterial. In the pH gradient method, the nanogel acted as an excellent template for the formation of well-dispersed HAp particles. Transmission electron microscopy, selected area electron diffraction patterns and energy-dispersive X-ray spectroscopy of these particles revealed that amorphous nanoparticles of amorphous calcium phosphate formed first, followed by transformation to crystalline hydroxyapatite.
Trimethyl-3-methoxy-4-oxo-5-triphenylphosphoranylidenecyclopent-1-ene-1,2,3-tricarboxylate  [cached]
Krzysztof K. Krawczyk,Krystyna Wojtasiewicz,Jan K. Maurin,Ewa Gronowska
Acta Crystallographica Section E , 2010, DOI: 10.1107/s1600536810037815
Abstract: The title compound, C30H27O8P (2), was formed as one of two products {(1) [Krawczyk et al. (2010). Acta Cryst. E66 (cv2752)] and (2)} in the reaction of dimethyl acetylenedicarboxylate with triphenylphosphine. The molecule of (2) consists of a five-membered carbocyclic ring. The P atom is a part of a triphenylphosphoranylidene substituent. In contrast to (1), the five-membered ring of (2) is planar, the r.m.s. deviation being only 0.009 (2) .
Trimethyl 1-(2-methyl-1-phenylsulfonyl-1H-indol-3-yl)propane-1,2,3-tricarboxylate  [cached]
T. Kavitha,M. Thenmozhi,Radhakrishnan Sureshbabu,A. K. Mohanakrishnan
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536808043286
Abstract: In the title compound, C24H25NO8S, the indole unit is planar and makes a dihedral angle of 79.73 (11)° with the phenyl ring of the sulfonyl substituent. The molecules in the unit cell are stabilized by C—H...O and C—H...π intermolecular interactions in addition to van der Waals forces.
Trimethyl Lock: A Stable Chromogenic Substrate for Esterases  [PDF]
Michael N. Levine,Luke D. Lavis,Ronald T. Raines
Molecules , 2008, DOI: 10.3390/molecules13020204
Abstract: p-Nitrophenyl acetate is the most commonly used substrate for detecting thecatalytic activity of esterases, including those that activate prodrugs in human cells. Thissubstrate is unstable in aqueous solution, limiting its utility. Here, a stable chromogenicsubstrate for esterases is produced by the structural isolation of an acetyl ester andp-nitroaniline group using a trimethyl lock moiety. Upon ester hydrolysis, unfavorablesteric interactions between the three methyl groups of this o-hydroxycinnamic acidderivative encourage rapid lactonization to form a hydrocoumarin and releasep-nitroaniline. This “prochromophore” could find use in a variety of assays.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.