Showing 1-30 of 30 results for "346721"
C 2-Symmetric diphenylphosphoramide and diphenylthiophosphoramide derived from (1R, 2R)-1, 2-diaminocyclohexane as ligands for the titanium (IV) alkoxide-promoted addition of diethylzinc to aldehydes.
Shi M and Sui WS
Tetrahedron Asymmetry, 10(17), 3319-3325 (1999)
Daniel P Iwaniuk et al.
The Journal of organic chemistry, 77(11), 5203-5208 (2012-05-12)
Stereoselective displacement of diacridylnaphthalene N,N'-dioxide ligands, 1, from a scandium(III) complex can be used for quantitative detection of 1,2-diaminocyclohexane isomers. The diastereoselective sensing assay with Sc(syn-1)(2) shows excellent linearity between the sample de and the measured UV absorption change, and...
Weixu Feng et al.
Inorganic chemistry, 51(21), 11377-11386 (2012-10-10)
Unique homoleptic cyclic tetranuclear Ln(4)(Salen)(4) complexes [Ln(4)(L)(2)(HL)(2)(μ(3)-OH)(2)Cl(2)]·2Cl (Ln = Nd, 1; Ln = Yb, 2; Ln = Er, 3; Ln = Gd, 4) or Ln(4)(Salen)(2) complexes [Ln(4)(L)(2)(μ(3)-OH)(2)(OAc)(6)] (Ln = Nd, 5; Ln = Yb, 6; Ln = Er, 7; Ln...
Mehmet Aslantaş et al.
Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy, 74(3), 617-624 (2009-08-04)
In this study, the Schiff base ligand trans-N,N'-bis[(2,4-dichlorophenyl) methylidene] cyclohexane-1,2-diamine (L) and its copper(II), nickel(II) and palladium(II) transition metal complexes were prepared and characterized by the analytical and spectroscopic methods. The (1)H((13)C) NMR spectra of the ligand and its diamagnetic...
Sibing Wang et al.
Chirality, 27(8), 543-550 (2015-05-23)
Single-handed twisted titania tubular nanoribbons were prepared through sol-gel transcription using a pair of enantiomers. Handedness was controlled by that of the template. The obtained samples were characterized using field-emission electron microscopy, transmission electron microscopy, diffuse reflectance circular dichroism (DRCD)...
Kui Mei et al.
Organic letters, 11(13), 2864-2867 (2009-06-03)
A highly enantioselective conjugate addition of nitroalkanes to enones has been developed. The process is efficiently catalyzed by a simple chiral cyclohexanediamine-derived primary amine thiourea with a broad substrate scope.
Michael J Bojdys et al.
Chemical communications (Cambridge, England), 48(98), 11948-11950 (2012-11-06)
The characterisation of porous crystalline solids often relies on single crystal X-ray diffraction, which does not give direct information about the surface of the material. Here, crystals of a porous organic cage, CC3-R, are investigated by atomic force microscopy and...
Takuya Kurahashi et al.
Journal of the American Chemical Society, 131(34), 12394-12405 (2009-08-27)
A series of Mn(IV)(salen)(L)(2) complexes bearing different external axial ligands (L = Cl, NO(3), N(3), and OCH(2)CF(3)) from chiral salen ligands with trans-cyclohexane-1,2-diamine as a chiral scaffold are synthesized, to gain insight into conformational properties of metal salen complexes. X-ray...
Chenier, P.J. et al.
Tetrahedron Letters, 38, 7341-7341 (1997)
Ignacio Caretti et al.
Physical chemistry chemical physics : PCCP, 13(45), 20427-20434 (2011-10-14)
Single enantiomers of R-/S-methylbenzylamine (MBA) were found to selectively form adducts with the chiral non-C(2) symmetric Cu-salen complex N-(3,5-di-tert-butylsalicylidene)-N'-(salicylidene)-cyclohexane-1,2-diamine copper(II), hereafter labelled [Cu(3)]. The g/A spin Hamiltonian parameters of this Cu(II) complex showed a decrease in symmetry from axial to...
Cristina Nativi et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 17(17), 4814-4820 (2011-03-10)
A new generation of chiral tripodal receptors for recognition of carbohydrates, featuring trans-1,2-diaminocyclohexane as a key structural element, and their recognition properties toward a set of glycosides of biologically relevant monosaccharides is described. The introduction of a chelating diamino unit...
Hiroki Hotta et al.
Analytical chemistry, 81(15), 6357-6363 (2010-03-27)
Metal ions were determined by ESI-MS in the negative ion mode as monovalent negative ions of their aminopolycarboxylic acid (APC) complexes, e.g., [Al(cydta)](-), [Pb(Hcydta)](-), where excess amounts of the APC agents were added to sample solutions. Among several APCs studied...
Chiral palladium (II) and platinum (II) complexes of diaminocyclohexane: X-ray structures of (1R, 2R)-(-)-1, 2-diaminocyclohexane dihydrochloride and its corresponding oxalato platinum (II) complex.
Abu-Surrah AS, et al.
Polyhedron, 22(12), 1529-1534 (2003)
Jana Kasparkova et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 14(4), 1330-1341 (2007-11-21)
The different antitumor and other biological effects of the third-generation antitumor platinum drug oxaliplatin [(1R,2R-diamminocyclohexane)oxalatoplatinum(II)] in comparison with those of conventional cisplatin [cis-diamminedichloridoplatinum(II)] are often explained by the ability of oxaliplatin to form DNA adducts of different conformation and consequently...
Hidekazu Yamada et al.
Journal of the American Chemical Society, 134(17), 7250-7253 (2012-04-18)
Optically active amidine dimer strands having a variety of chiral and achiral linkers with different stereostructures are synthesized and used as templates for diastereoselective imine-bond formations between two achiral carboxylic acid monomers bearing a terminal aldehyde group and racemic 1,2-cyclohexanediamine...
Ran Feng et al.
Dalton transactions (Cambridge, England : 2003), 42(6), 2130-2145 (2012-11-29)
In this paper, the origins of enantioselectivity in asymmetric ketone hydrogenation catalyzed by RuH(2)(binap)(cydn) (cydn = trans-1,2-diaminocyclohexane) were discussed. Fifteen substrates involving aromatic, heteroaromatic, olefinic and dialkyl prochiral ketones were used to probe the catalytic mechanism and find an effective...
Atsushi Hirano et al.
The protein journal, 27(4), 253-257 (2008-02-27)
Although solution additives prevent protein misfolding, the mechanism remains elusive. In this paper, we compare the preventive effects of trans-1,2-cyclohexanediamine (1,2-CHDA) and trans-1,4-cyclohexanediamine (1,4-CHDA) on the heat-induced inactivation of ribonuclease A (RNase A) and lysozyme. These additives are more effective...
Mukaiyama, T.
Aldrichimica Acta, 29, 59-59 (1996)
Kenji Yoshikawa et al.
Bioorganic & medicinal chemistry, 17(24), 8221-8233 (2009-11-11)
A series of cis-1,2-diaminocyclohexane derivatives possessing a 6-6 fused ring for the S1 moiety were synthesized as novel factor Xa (fXa) inhibitors. The synthesis, structure-activity relationship (SAR), and physicochemical properties are reported herein, together with the discovery of compound 45c...
Anna Minarini et al.
Bioorganic & medicinal chemistry, 16(15), 7311-7320 (2008-07-04)
Pirenzepine (2) is one of the most selective muscarinic M(1) versus M(2) receptor antagonists known. A series of 2 analogs, in which the piperazyl moiety was replaced by a cis- and trans-cyclohexane-1,2-diamine (3-6) or a trans- and cis-perhydroquinoxaline rings (7...
Yu He et al.
Inorganic chemistry, 50(24), 12651-12660 (2011-11-11)
Iron complexes with the tetradentate N-donor ligand N,N'-di(phenylmethyl)-N,N'-bis(2-pyridinylmethyl)-1,2-cyclohexanediamine (bbpc) are reported. Despite the benzyl groups present on the amines, the iron compounds catalyze the oxygenation of cyclohexane to an extent similar to those employing less sterically encumbered ligands. The catalytic...
Robert Häner et al.
Journal of the American Chemical Society, 132(21), 7466-7471 (2010-05-13)
Oligopyrenotides, abiotic oligomers that exhibit significant structural analogies to the nucleic acids, are described. They are composed of achiral, phosphodiester-linked pyrene building blocks and a single chiral 1,2-diaminocyclohexane unit. These oligomers form stable hybrids in aqueous solution. Hybridization is based...
Farukh Arjmand et al.
Chirality, 23(3), 250-259 (2010-10-12)
A new chiral series of potential antitumor metal-based complexes 1-3(a and b) of L- and D-tryptophan have been synthesized and thoroughly characterized. Both enantiomers of 1-3 bind DNA noncovalently via phosphate interaction with slight preference of metal center for covalent...
Nagendar Pendem et al.
Journal of the American Chemical Society, 135(12), 4884-4892 (2013-03-01)
Aliphatic N,N'-linked oligoureas are peptidomimetic foldamers that adopt a well-defined helical secondary structure stabilized by a collection of remote three-center H-bonds closing 12- and 14-membered pseudorings. Delineating the rules that govern helix formation depending on the nature of constituent units...
Cong-Ling Wang et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 18(38), 11909-11912 (2012-08-15)
Magnetic personality: A pentavalent vanadium source was employed to prepare the largest highly reduced polyoxovanadate cluster by virtue of the reducing power of 1,2-diaminocyclohexane under hydrothermal conditions. The new non-classical triangle-shaped cluster shows good catalytic selectivity for the oxidation of...
Kenji Yoshikawa et al.
Bioorganic & medicinal chemistry, 17(24), 8206-8220 (2009-11-04)
A series of cis-1,2-diaminocyclohexane derivatives were synthesized with the aim of optimizing previously disclosed factor Xa (fXa) inhibitors. The exploration of 5-6 fused rings as alternative S1 moieties resulted in two compounds which demonstrated improved solubility and reduced food effect...
Yanyan Sun et al.
ChemMedChem, 7(4), 642-649 (2012-01-17)
A series of platinum(II) complexes with N-monocyclopentyl/cyclohexyl derivatives of 1R,2R-diaminocyclohexane as carrier ligands and dicarboxylate anions as leaving groups were synthesized and characterized. All complexes were characterized by elemental analysis, IR, (1)H NMR, and (13)C NMR spectroscopy, as well as...
Eun-Young Jeong et al.
Chemical communications (Cambridge, England), 48(25), 3079-3081 (2012-02-22)
trans-1,2-Diaminocyclohexane functionalized mesoporous silica was applied as an ideal catalyst for asymmetric Michael addition of various nitroalkane derivatives. Short channels and plugs in the pore structure offered chiral enhancement in Michael addition.
Chiral amino-urea derivatives of (1R, 2R)-1, 2-diaminocyclohexane as ligands in the ruthenium catalysed asymmetric reduction of aromatic ketones by hydride transfer.
Bied C, et al.
Tetrahedron Asymmetry, 12(2), 329-336 (2001)
Yanyan Sun et al.
Journal of inorganic biochemistry, 112, 68-76 (2012-05-09)
A number of platinum (II) complexes, characteristic of (1R,2R)-N(1)-alkyl-1,2-diaminocyclohexane derivatives as carrier ligands, were designed, synthesized and characterized, where the alkyl group serving as hindrance is a 1-butyl, 2-methylpropyl or 2-butyl moiety, respectively. In vitro biological evaluation of these platinum...

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