Publication Date: 2012
Acta Crystallographica Section E: Structure Reports Online (16005368)68(6)
The title compound, [Cu3(C7H3NO 4)4(C2H8N2) 2]·C2H8N2·4H 2O, was obtained by the reaction of copper(II) acetate dihydrate with pyridine-2,6-dicarboxylic acid (H2dipic) and ethylenediamine (en) in an aqueous solution. All of the CuII atoms in the trinuclear centrosymmetric title complex are six-coordinated in a distorted octahedral geometry with N2O4 and N4O2 environments for the outer and central CuII atoms, respectively. Various interactions, including numerous O - H⋯O and C - H⋯O hydrogen bonds and C - O⋯π stacking of the pyridine and carboxylate groups [O⋯centroid distances = 3.669 (2) and 3.668 (2) Å] are observed in the crystal structure.
Publication Date: 2011
Acta Crystallographica Section E: Structure Reports Online (16005368)67(12)
In the title compound, [Cu(C24H27N4O 3)]ClO4, the CuII atom has a distorted square-planar coordination geometry and is surrounded by an N3O donor set composed of a secondary amine N, a primary amine H, an imino N and a naphthalen-2-olate O atom. An intramolecular N - H⋯O hydrogen bond occurs. In the crystal, molecules are held together by intermolecular N-H⋯O hydrogen bonds, leading to the formation of a three-dimensional network.
Publication Date: 2013
Synlett (09365214)24(9)pp. 1086-1090
The Lewis acidic room-temperature ionic liquid, [bmim][InCl4], was found to be an efficient catalyst for the regioselective synthesis of fully substituted pyrazoles and pyrazole-fused cyclohexanones through condensation of hydrazones with symmetrical and unsymmetrical 1,3-diketones. This procedure is simple, affording the corresponding products in good to high yields.
Publication Date: 2017
Journal Of The Iranian Chemical Society (1735207X)14(8)pp. 1753-1763
In this research, two heterogeneous organic–inorganic hybrid catalysts, [bmim]3[PW12O40]·3H2O and [bmim]5[PNiW11O39]·3H2O, have been prepared. The catalysts were fully characterized by several techniques such as elemental analyses, Fourier transform infrared spectroscopy, thermo-gravimetric analysis, scanning electron microscope and energy-dispersive X-ray analysis. Next, the hybrid catalysts have been used for the synthesis of functionalized diazepines containing tetrazole ring. Tetrazolyl-1H-spiro[benzo[b]cyclopenta[e][1,4] diazepines products were obtained in excellent yields and mild experimental conditions using [bmim]5[PNiW11O39]·3H2O as catalyst. This process was carried out via a one-pot, pseudo-five-component condensation reaction by means of a 1,2-diamine, isocyanide, TMSN3 and two molecules of a linear or cyclic ketone in methanol, at ambient temperature. © 2017, Iranian Chemical Society.
Publication Date: 2014
Journal Of The Iranian Chemical Society (1735207X)11(5)pp. 1493-1501
Di[1,6-bis(3-methylimidazolium-1-yl)hexane] decatangstate ([C-6(MIm)(2)](2)W10O32) was found to be a novel, powerful and effective catalyst for the preparation of N-benzoylglycine carbamides as derivatives of AT-130 via one-pot multicomponent reaction performed under microwave irradiations. The products were obtained in high to excellent yields, thus providing a unique strategy to the large-scale synthesis of these compounds.
Publication Date: 2011
Comptes Rendus Chimie (18781543)14(10)pp. 869-877
Di[1,6-bis(3-methylimidazolium-1-yl)hexane] decatungstate dihydrate ([C-6(MIm)(2)](2) W10O32. 2H(2)O) as a new family of polyoxometalate-based dicationic ionic liquids (POM-DIL) is synthesized and employed as a novel and powerful heterogeneous catalyst in the synthesis of 4-arylidene-2-phenyl-5(4)-oxazolones (azlactones) under ultrasound-assisted solvent-free condition. On the basis of the results, the products were obtained in excellent yields under mild condition. Utilization of easy work-up and purification make it very interesting from an economic perspective. Moreover, a recycling study confirmed that the catalyst can be reused multiple times without significant loss of its activity. (C) 2011 Academie des sciences. Published by Elsevier Masson SAS. All rights reserved.
Publication Date: 2006
Journal of Chemical Research (03082342)(1)pp. 29-31
Efficient solvent-free oxidation of alcohols, deprotection and oxidative deprotection of trimethylsilyl ethers and oxidative deprotection of oximes using tris [trinitratocerium (IV)] paraperiodate (TTCPP) is reported.
Publication Date: 2011
Comptes Rendus Chimie (16310748)14(6)pp. 568-579
A simple, green and chemoselective method for methoxymethylation and ethoxymethylation of primary and secondary alcohols using a Lewis acidic room temperature ionic liquid, [C4mim][InCl4], as catalyst and reaction medium under ambient temperature, microwave and ultrasonic irradiations is reported. In this catalytic system, the corresponding MOM-and EOM-ethers are obtained in excellent yields and in short reaction times. Furthermore, this catalytic system was used for mild and efficient transformations of these protected alcohols to their corresponding acetates and trimethylsilyl ethers under thermal conditions and microwave and ultrasonic irradiations. © 2010 Académie des sciences. Published by Elsevier Masson SAS. All rights reserved.
Publication Date: 2010
Journal of the Iranian Chemical Society (1735207X)7(3)pp. 673-677
The use of ultrasonic irradiation for the selective synthesis of sulfone in the oxidation of sulfides with NaIO4 catalyzed by Mn(Salophen) supported on chloromethylated polystyrene-bound imidazole, [Mn(Salophene)-PSI], is reported. This heterogeneous catalyst efficiently catalyzed selective oxidation of sulfides to sulfones under ultrasonic irradiation and no sulfoxide was detected in the reaction mixture.
Publication Date: 2016
Journal Of The Iranian Chemical Society (1735207X)13(6)pp. 1061-1067
Effective epoxidation of alkenes using sodium periodate was accomplished with Manganese (III) tetrakis(p-sulfonatophenyl)porphyrin, [C44H26N4O12S4Na4], supported on ionic liquids-modified silica, Im-SiO2, under ultrasonic irradiation conditions is reported. This heterogeneous catalyst, [Mn(TPPS)@SiO2-Im] was characterized by elemental analysis, scanning electron microscopy (SEM), FT-IR and UV–Vis spectroscopic methods. The synthesized hybrid catalyst was applied for efficient epoxidation of various alkenes with sodium periodate in acetonitrile under ultrasonic irradiation conditions. This solid catalyst can be easily recovered by simple filtration and reused several time without apparent loss of its catalytic activity. © 2016, Iranian Chemical Society.
Publication Date: 2005
Acta Crystallographica Section E: Structure Reports Online (16005368)61(3)
In the title compound, [Re(CF3COO)(C20H 24N2)(CO)3], the Re atom has a distorted octahedral configuration. The 1,4-diazabutadiene part of the donor ligand and two carbonyl groups occupy the equatorial plane of the complex, with the third carbonyl ligand and the trifluoroacetate group in the axial positions. The equatorial diimine ligand is bound to the Re center in an N,N′-bidentate chelating fashion, leading to a five-membered ReN2C2 chelate ring with an N - Re - N bite angle of 73.4 (2)°. © 2005 International Union of Crystallography Printed in Great Britain - all rights reserved.
Publication Date: 2012
Comptes Rendus Chimie (16310748)15(11-12)pp. 975-979
The epoxidation of alkenes with hydrogen peroxide catalyzed by [PZnMo 2W 9O 39] 5-, ZnPOM, supported on ionic liquid-modified silica, Im-SiO 2, is reported. The immobilized catalyst, [ZnPOM@Im-SiO 2] was characterized by elemental analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), FT-IR and UV-Vis spectroscopic methods. This new synthesized hybrid catalyst was applied for efficient epoxidation of various olefins with aqueous H 2O 2 in acetonitrile under reflux conditions. This solid catalyst can be easily recovered by simple filtration and reused several times without significant loss of its catalytic activity. © 2012 Published by Elsevier Masson SAS on behalf of Académie des sciences.
Publication Date: 2022
Dalton Transactions (14779226)51(16)pp. 6314-6331
Water electrolysis is one of the most capable processes for supplying clean fuel. Herein, two novel ionic Ru(ii)-Fe(ii) complexes, [Ru(tmphen)3]2[Fe(CN)6] and [Ru(phen)3][Fe(CN)5(NO)], where tmphen = 3,4,7,8-tetramethyl-1,10-phenanthroline and phen = 1,10-phenanthroline, were synthesized and characterized by UV-Vis spectroscopy, elemental analysis, FT-IR, and single-crystal X-ray structural analysis. By thermally decomposing the [Ru(tmphen)3]2[Fe(CN)6] complex at 600 °C for 4 h, a heterostructured RuO2-Fe2O3 nanocomposite was fabricated through a facile one-pot treatment and then characterized by FT-IR, XRD, FT-Raman, UV-Vis (DRS), ICP-OES, FE-SEM, TEM, TGA/DTG, BET, and XPS analyses, which revealed the formation of highly crystalline RuO2-Fe2O3 nanoparticles with an average size of 8-12 nm. The prepared nanocomposite was an efficient heterostructured electrocatalyst for performing water-splitting redox reaction processes, including hydrogen and oxygen evolution reactions (HER and OER) in alkaline solutions. In this regard, RuO2 and Fe2O3 samples were also prepared through thermal decomposition of [Ru(tmphen)3](NO3)2 and K4[Fe(CN)6] precursors, respectively, as control experiments to compare their HER and OER electrocatalytic activity with that of the RuO2-Fe2O3 nanocomposite. Specifically, the RuO2-Fe2O3 nanocomposite exhibited significant electrocatalytic performance, generating 10 mA cm−2 current density at −148 and 292 mV overpotentials, and the Tafel slope results from fitting the LSV curves to the Tafel equation were −43 and 56.08 mV dec−1 for the HER and OER, respectively. Therefore, the heterostructured RuO2-Fe2O3 nanocomposite can be viewed as a bi-functional electrocatalyst for HER and OER because it exploits the synergistic effects of heterostructures and active sites at its interface. © 2022 The Royal Society of Chemistry.
Publication Date: 2010
Polyhedron (02775387)29(1)pp. 212-219
Tin(IV)tetraphenylporphyrinato tetrafluoroborate, [SnIV(TPP)(BF4)2], was used as an efficient catalyst for trimethylsilylation of alcohols and phenols with hexamethyldisilazane (HMDS). High-valent [SnIV(TPP)(BF4)2] catalyzes trimethylsilylation of primary, secondary and tertiary alcohols as well as phenols, and the corresponding TMS-ethers were obtained in high yields and short reaction times at room temperature. While, under the same reaction conditions [SnIV(TPP)Cl2] is less efficient to catalyze these reactions. One important feature of this catalyst is its ability in the chemoselective silylation of primary alcohols in the presence of secondary and tertiary alcohols and phenols. The catalyst was reused several times without loss of its catalytic activity. © 2009 Elsevier Ltd. All rights reserved.
Publication Date: 2011
Acta Crystallographica Section E: Structure Reports Online (16005368)67(8)
The complete molecule of the title complex, [Cu(C 31H 28N 2O 2)], is generated by the application of twofold symmetry; the Cu and CMe 2 atoms lie on the axis. The geometry around the Cu II atom is distorted square-planar. The dihedral angle between the two phenyl rings is 76.0 (3) °. The crystal packing is stabilized by inter-molecular C - H⋯π interactions.
Publication Date: 2011
Acta Crystallographica Section E: Structure Reports Online (16005368)67(9)
The asymmetric unit of the title complex, [Ni(C 31H 28N 2O 2)], comprises two crystallographically independent molecules. The geometry around the Ni II atom in each molecule is distorted square planar. The dihedral angles between the two phenoxy rings in each molecule are 17.8 (4) and 36.5 (4)°. The crystal packing is stabilized by weak π-π interactions [centroidcentroid distance = 3.758 (5) Å] and C - H⋯π interactions.
Publication Date: 2012
Acta Crystallographica Section E: Structure Reports Online (16005368)68(8)
In the title Schiff base complex, [Cu(C19H18Cl2N2O2)], the CuII ion is coordinated in a distorted square-planar environment by two N atoms and two O atoms of the tetra-dentate ligand. The dihedral angle between the benzene rings is 36.86 (14)°. In the crystal, mol-ecules are linked into inversion dimers by pairs of weak C-H⋯O hydrogen bonds. In addition, π-π [centroid-centroid distance = 3.7279 (16) Å] and weak C-H⋯π inter-actions are observed.
Publication Date: 2012
Acta Crystallographica Section E: Structure Reports Online (16005368)68(10)
The asymmetric unit of the title compound, [Cu(C21H 24-N2O4)]·H2O, comprises half of a Schiff base complex and a water molecule. The CuII atom, water molecule and one C atom of the central propylene segment are located on a twofold rotation axis. The geometry around the CuII atom is distorted square-planar, supported by the N2O2 donor atoms of the coordinating ligand. The dihedral angle between the symmetry-related benzene rings is 42.56 (19)°. In the crystal, O-H···O hydrogen bonds involving the water molecule make an R1/2(6) ring motif. Complex molecules are linked into a chain along the c axis via C-H···O interactions.
Publication Date: 2012
Acta Crystallographica Section E: Structure Reports Online (16005368)68(9)
The asymmetric unit of the title compound, [Cu(C21H 24N2O2)]·H2O, comprises half of a Schiff base complex and half of a water molecule. The whole compound is generated by crystallographic twofold rotation symmetry. The geometry around the CuII atom, located on a twofold axis, is distorted square-planar, which is supported by the N2O2 donor atoms of the coordinating Schiff base ligand. The dihedral angle between the symmetry-related benzene rings is 47.5 (4)°. In the crystal, the water molecule that is hydrogen bonded to the coordinated O atoms links the molecules via O - H⋯O interactions into chains parallel to [001]. The crystal structure is further stabilized by C - H⋯π interactions, and by π-π interactions involving inversion-related chelate rings [centroid-centroid distance = 3.480 (4) Å].
Publication Date: 2008
Acta Crystallographica Section E: Structure Reports Online (16005368)64(9)
In the title complex, [Ni(C20H14N2O4)]·2H2O, the NiII ion is in an essentially square-planar geometry involving an N2O2 atom set of the tetra-dentate Schiff base ligand. The Ni atom lies on a crystallographic twofold rotation axis. The asymmetric unit contains one half-mol-ecule of the complex and a water mol-ecule. An inter-molecular O - H⋯O hydrogen bond forms a four-membered ring, producing an R 1 2(4) ring motif involving a bifurcated hydrogen bond to the phenolate O atoms of the complex mol-ecule. In the crystal structure, mol-ecules are linked by π-π stacking inter-actions, with centroid-centroid distances in the range 3.5750 (11)-3.7750 (11) Å. As a result of the twofold symmetry, the central benzene ring makes the same dihedral angle of 15.75 (9)° with the two outer benzene rings. The dihedral angle between the two hydroxy-phenyl rings is 13.16 (5)°. In the crystal structure, mol-ecules are linked into infinite one-dimensional chains by directed four-membered O - H⋯O - H inter-actions along the c axis and are further connected by C - H⋯O and π-π stacking into a three-dimensional network. An inter-esting feature of the crystal structure is the short Ni⋯O, O⋯O and N⋯N inter-actions which are shorter than the sum of the van der Waals radii of the relevant atoms. The crystal structure is stabilized by inter-molecular O - H⋯O and C - H⋯O hydrogen bonds and by π-π stacking inter-actions.
Publication Date: 2011
Acta Crystallographica Section E: Structure Reports Online (16005368)67(6)
In the title compound, [Cu(C34H24N4O 2S2)] or [Cu(bqdapte)], where H2bqdapte is 1,2-{bis-[2-(quinoline-2-carboxamido)-phen-yl]sulfan-yl}ethane, the Cu II ion is coordinated to the dianionic hexa-dentate bqdapte 2- ligand by two amide and two quinoline N atoms and two thio-ether S atoms. In the observed conformation of the hexa-dentate ligand, the quinoline rings attain positions related by a twofold axis. The Cu atom displays a Jahn-Teller-distorted octa-hedral CuN4S2 geometry axially compressed along the two trans-configured Cu - Namidate bonds.
Publication Date: 2006
Synthetic Communications (00397911)36(1)pp. 65-70
Trisubstituted imidazoles have been synthesized in very short reaction times with excellent yields in the presence of 1,1,3,3-N,N,N′,N′- tetramethylguanidinium trifluoroacetate as an ionic liquid at 100°C. The ionic liquid can be recycled for subsequent reactions without any appreciable loss of efficiency. Copyright © Taylor & Francis LLC.
Publication Date: 2010
Canadian Journal of Chemistry (00084042)88(2)pp. 135-141
A simple, facile, and efficient procedure for the synthesis of 2-arylthizolines and 2-arylimidazolines has been developed by the simple condensation of nitriles with 2-aminoethanethiol or ethylenediamine catalyzed by 1,3-dibromo-5,5-dimethylhydantoin under solvent-free conditions. Selective preparation of bisthiozolines and monoimidazolines from dinitriles and also selective conversion of arylnitriles to their corresponding 2-arylthiazolines or imidazolines in the presence of alkylnitriles can be considered as considerable advantages of this method.
Publication Date: 2000
Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry (03764699)39(11)pp. 863-866
The preparation of 1,4-dibenzyl-1,4-diazoniabicyclo[2.2.2]-octane chlorochromate 1 is described. With this reagent benzylic and allylic alcohols are selectively oxidized to their corresponding carbonyl compounds in excellent yields. Oximes, thiols and aromatic amines are also converted to their corresponding carbonyl compounds, disulfides and azo compounds efficiently.
Publication Date: 2011
Acta Crystallographica Section E: Structure Reports Online (16005368)67(12)
The title Schiff base compound, C33H30N 4O4·H2O, adopts an E configuration with respect to each C=N double bond. In the molecule, there are naphthoxide anions and the protonated imino N atoms. intramolecular N-H⋯O hydrogen bonds lead to the formation of approximately planar (maximum deviation 0.029 Å for H atom) six-membered rings.. In the crystal, molecules are linked by O-H⋯O and N-H⋯O hydrogen bonds as well as C - H⋯O contacts, leading to the formation of a three-dimensional network..
Publication Date: 2008
Polyhedron (02775387)27(12)pp. 2612-2624
A wide variety of primary and secondary alcohols were efficiently converted to their corresponding methoxymethyl (MOM) and ethoxymethyl (EOM) ethers in the presence of catalytic amounts of supported H3PW12O40 on silica gel and zirconia at room temperature and under microwave irradiation at solvent-free conditions, whereas, phenols and tertiary alcohols remained intact under the same reaction conditions. Deprotection of these ethers to their parent alcohols was also achieved using these heterogeneous catalysts in ethanol, as a green solvent, under reflux conditions and microwave irradiation. Selective deprotection of primary and secondary MOM- and EOM-ethers in the presence of phenolic and tertiary ones, methyl and benzyl ethers, esters and trimethylsilyl ethers was achieved by these reagent systems. The present methodology offers several advantages such as short reaction times, high yields, simple procedure, heterogeneous reaction conditions, selectivity, non-toxicity and reusability of the catalysts. © 2008.
