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Articles 1 - 30 of 106
Full-Text Articles in Physical Sciences and Mathematics
Synthesis, Characterization, And Metal Extraction Studies Of A New Macrobicyclic Ligand, Hali̇l Zeki̇ Gök, Yaşar Gök, Esra Eker
Synthesis, Characterization, And Metal Extraction Studies Of A New Macrobicyclic Ligand, Hali̇l Zeki̇ Gök, Yaşar Gök, Esra Eker
Turkish Journal of Chemistry
This article describes the synthesis, characterization, and metal ion binding properties of a new macrobicyclic ligand. Solvent extraction experiments were performed in order to determine the extraction behavior of new macrobicyclic ligand towards selected metal cations. Selective extraction of heavy metals and precious metals is highly demanded due to their toxicity and commercial importance. Based on our experimental results, macrobicyclic ligand 3 demonstrated remarkable affinity towards the Ag^+ ion by 96.7% and 96.9% to the dichloromethane and chloroform phases, respectively. The extraction experiments with macrobicyclic ligand 3 for the Ag^+ ion were repeated at different temperatures to calculate thermodynamic parameters. …
Synthesis, Properties, And Electrochemistry Of A Photochromic Compound Based On Dithienylethene And Prodot, Melek Pamuk Algi, Ati̇lla Ci̇haner, Fati̇h Algi
Synthesis, Properties, And Electrochemistry Of A Photochromic Compound Based On Dithienylethene And Prodot, Melek Pamuk Algi, Ati̇lla Ci̇haner, Fati̇h Algi
Turkish Journal of Chemistry
The synthesis, photochromic features, and electrochemistry of a novel material based on dithienylethene (DTE) and 3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepine (didecyl-ProDOT) units are described. It is noteworthy that 1,2-bis(5-(3,3-didecyl-3,4-dihydro-2H-thieno[3,4-b][1,4]dioxepin-6-yl)-2-methylthiophen-3-yl)cyclopent-1-ene can be efficiently switched between open and closed states by light in both solution and in the solid poly(methyl metacrylate) (PMMA) matrix. It is also found that the emission of this novel compound can be switched on and off upon irradiation.
Synthesis And Characterization Of Novel Urea And Thiourea Substitute Cyclotriphosphazene Compounds As Naked-Eye Sensors For F$^{-}$ And Cn$^{-}$ Anions, Hava Özay, Mehmet Yildirim, Özgür Özay
Synthesis And Characterization Of Novel Urea And Thiourea Substitute Cyclotriphosphazene Compounds As Naked-Eye Sensors For F$^{-}$ And Cn$^{-}$ Anions, Hava Özay, Mehmet Yildirim, Özgür Özay
Turkish Journal of Chemistry
Novel hexakisurea and thiourea cyclotriphosphazene compounds (3-7) were synthesized. The structure of all compounds was identified using FT-IR $^{1}$H, $^{13}$C, and $^{31}$P NMR spectroscopy; MALDI-TOF MS; and elemental analysis. The optical sensor properties for anions of 3-7 were investigated using UV-Vis spectroscopy. It was determined that compounds 6 and 7 are spectrophotometric and naked eye sensors for F$^{-}$ and CN$^{-}$ anions, respectively. Sensor properties of these compounds for anions were investigated using UV-Vis spectroscopy. The stoichiometry of host-guest complexes was found to be 1:6.
Properties And Some In Vitro Studies Of 6-Phosphogluconate Dehydrogenase Purified From The Liver Of Chalcalburnus Tarichi, The Only Fish Living In Lake Van's Highly Alkaline Water (Ph 9.8), Muhammet Güler, Vedat Türkoğlu, Mehmet Riza Kivanç
Properties And Some In Vitro Studies Of 6-Phosphogluconate Dehydrogenase Purified From The Liver Of Chalcalburnus Tarichi, The Only Fish Living In Lake Van's Highly Alkaline Water (Ph 9.8), Muhammet Güler, Vedat Türkoğlu, Mehmet Riza Kivanç
Turkish Journal of Chemistry
In this study, some enzymology parameters and some antibiotics affecting the enzyme activity of 6-phosphogluconate dehydrogenase (6PGD) extracted from t the livers of fish from Lake Van (\textit{Chalcalburnus tarichi}) were investigated because it is an important enzyme-producing NADPH, a reductive power, protecting the cell against the oxidative agents by producing reduced glutathione. The crude enzyme solution was obtained by using the affinity chromatography method. The native molecular weight of the enzyme is $\sim $90,000 $\pm $ 3000 Da and it is composed of two subunits with identical molecular weights of $\sim $46,000 Da as exhibited on sodium dodecyl sulfate-polyacrylamide gel …
Secondary Metabolites From Sambucus Ebulus, İrem Atay, Hasan Kirmizibekmez, Ahmet Ceyhan Gören, Erdem Yeşi̇lada
Secondary Metabolites From Sambucus Ebulus, İrem Atay, Hasan Kirmizibekmez, Ahmet Ceyhan Gören, Erdem Yeşi̇lada
Turkish Journal of Chemistry
A new nonglycosidic iridoid, sambulin B (1), was isolated from the methanol extract of Sambucus ebulus L. leaves along with a recently reported new nonglycosidic iridoid, 10-O-acetylpatrinoside aglycone (sambulin A) (2); 2 flavonoids, isorhamnetin-3-O-\beta-D-glucopyranoside (3) and isorhamnetin-3-O-rutinoside (4); and a mixture of 2 flavonoids (5), quercetin-3-O-\beta-D-glucopyranoside and quercetin-3-O-\beta-D-galactopyranoside. Their structures were elucidated by 1-D and 2-D nuclear magnetic resonance spectroscopy (NMR) and mass spectrometry (MS) experiments.
Synthesis And Characterization Of Substituted Benzimidazole Co(Ii), Fe(Ii), And Zn(Ii) Complexes And Structural Characterization Of Dichlorobis{1-[2-(1-Piperidinyl)Ethyl]-1h-Benzimidazole-_Kn^3} Zinc(Ii), Hasan Küçükbay, Ülkü Yilmaz, Mehmet Akkurt, Orhan Büyükgüngör
Synthesis And Characterization Of Substituted Benzimidazole Co(Ii), Fe(Ii), And Zn(Ii) Complexes And Structural Characterization Of Dichlorobis{1-[2-(1-Piperidinyl)Ethyl]-1h-Benzimidazole-_Kn^3} Zinc(Ii), Hasan Küçükbay, Ülkü Yilmaz, Mehmet Akkurt, Orhan Büyükgüngör
Turkish Journal of Chemistry
The Co(II), Fe(II), and Zn(II) complexes of 1-(3-phenyl)propylbenzimidazole (PPBI), 5-nitro-1-(3-phenyl) propylbenzimidazole (PPNBI), 1-[2-(4-morpholinyl)ethyl]benzimidazole (MEBI), 1-[2-(1-piperidinyl)ethyl]benzimidazole (PEBI), and 5-nitro-1-[2-(1-piperidinyl)ethyl]benzimidazole (PENBI) were synthesized and characterized by ^1H NMR, ^{13}C NMR, and elemental analyses. The magnitudes of the magnetic moments for paramagnetic complexes were between 4.07 and 5.11 B.M. Moreover, the crystal structure of dichlorobis{1-[2-(1-piperidinyl)ethyl]-1H-benzimidazole-_KN^3} zinc(II) was determined by single crystal X-ray diffraction.
Deposition Of Cadmium Sulfide And Zinc Sulfide Thin Films By Aerosol-Assisted Chemical Vapors From Molecular Precursors, Ashfaque Ahmed Memon, Malik Dilshad, Neerish Revaprasadu, Muhammad Azad Malik, James Raftery, Javeed Akhtar
Deposition Of Cadmium Sulfide And Zinc Sulfide Thin Films By Aerosol-Assisted Chemical Vapors From Molecular Precursors, Ashfaque Ahmed Memon, Malik Dilshad, Neerish Revaprasadu, Muhammad Azad Malik, James Raftery, Javeed Akhtar
Turkish Journal of Chemistry
New complexes with the general formula [M(S_2CN^nBu_2)_2] [where M = Cd^{II} (1) and Zn^{II} (2)] were synthesized and used as single source precursors to deposit thin films of cadmium sulfide and zinc sulfide by the aerosol-assisted chemical vapor deposition technique. The single crystal X-ray structures of 1 and 2 are also reported. Thermogravimetric analysis of 1 and 2 showed that both precursors decompose cleanly in a single step to produce their respective metal sulfides. The deposition of thin films was carried out on soda glass substrates in the 350--450 °C temperature range under inert conditions. The as-deposited thin films were …
Synthesis Of New Oxindole Derivatives Containing Benzothiazole And Thiazolidinone Moieties Using Nano Silica-Bonded 5-N-Propyl-Octahydro-Pyrimido[1,2-A]Azepinium Chloride (Nsb-Dbu) As Catalyst, Robabeh Baharfar, Narges Shariati
Synthesis Of New Oxindole Derivatives Containing Benzothiazole And Thiazolidinone Moieties Using Nano Silica-Bonded 5-N-Propyl-Octahydro-Pyrimido[1,2-A]Azepinium Chloride (Nsb-Dbu) As Catalyst, Robabeh Baharfar, Narges Shariati
Turkish Journal of Chemistry
A facile one-pot synthesis of novel oxindole derivatives bearing benzothiazolylmethyl-2-thioxothiazolidin-4-one was accomplished via one-pot reaction of 5-oxoindolinylidene rhodanine-3-acetic acid derivatives, 2-aminothiophenol, and triphenyl phosphite in the presence of tetrabutylammonium bromide (TBAB) and nano silica-bonded 5-n-propyl-octahydro-pyrimido[1,2-a]azepinium chloride (NSB-DBU) as heterogeneous reusable nanocatalyst. The target compounds were obtained in excellent yields (85%--92%) and short reaction times under fairly mild reaction conditions.
Synthesis, Structural Characterization, And Antimicrobial Efficiency Of Sulfadiazine Azo-Azomethine Dyes And Their Bi-Homonuclear Uranyl Complexes For Chemotherapeutic Use, Abdalla M. Khedr, Fawaz A. Saad
Synthesis, Structural Characterization, And Antimicrobial Efficiency Of Sulfadiazine Azo-Azomethine Dyes And Their Bi-Homonuclear Uranyl Complexes For Chemotherapeutic Use, Abdalla M. Khedr, Fawaz A. Saad
Turkish Journal of Chemistry
Two sulfadiazine azo-azomethine dyes containing two active coordination centers and their bi-homonuclear UO_2(II)-complexes were synthesized for potential chemotherapeutic use. The ligands were prepared, starting from the coupling of sulfadiazine dizonium salt with acetylacetone, followed by condensation with ethylenediamine and 1,6-hexanediamine (HL^I and HL^{II}) using a modified literature procedure. The structures of the ligands and their UO_2(II)-complexes were elucidated by conventional and thermal gravimetric analyses, molar conductivity, magnetic susceptibility, and IR, UV-Vis, ^1H NMR, and mass spectra. The analytical and spectral data supported the binuclear formulation of the complexes with a 2:1 metal to ligand ratio and octahedral geometry. The molar …
Effect Of Sonic Treatment On The Permeation Performance Of Cellulose Acetate Membranes Modified By N-Sio_2, Gülsen Asman, Mürvet Kaya, Nursel Pekel Bayramgi̇l
Effect Of Sonic Treatment On The Permeation Performance Of Cellulose Acetate Membranes Modified By N-Sio_2, Gülsen Asman, Mürvet Kaya, Nursel Pekel Bayramgi̇l
Turkish Journal of Chemistry
Cellulose acetate (CA) membranes were modified by nano-silicon dioxide (n-SiO_2), and they were exposed to ultrasonic waves at a frequency of 35 kHz. The effect of sonication on their water sorption tendency and permeation capability was investigated. The characterization of the membranes was done by FTIR and SEM analysis, and the hydrophilic character of the membranes was deduced by swelling studies and contact angle (CAn) measurements. Permeation studies of the membranes were performed by using the diffusion method and theophylline was used as a model chemical in the permeation studies. The results indicated that beside the high hygroscopic property of …
Synthesis And Biological Evaluation Of New Pyridines Containing Imidazole Moiety As Antimicrobial And Anticancer Agents, Ikhlass Abbas, Sobhi Gomha, Mahmoud Elaasser, Mohammed Bauomi
Synthesis And Biological Evaluation Of New Pyridines Containing Imidazole Moiety As Antimicrobial And Anticancer Agents, Ikhlass Abbas, Sobhi Gomha, Mahmoud Elaasser, Mohammed Bauomi
Turkish Journal of Chemistry
The synthesis of a novel series of pyridine and bipyridine derivatives is described via one-pot multicomponent reaction of 5-acetylimidazole, malonitrile (or ethylcyanoacetate or diethylmalonate), substituted benzaldehyde (or terephthaldehyde), and ammonium acetate in good yields. The structures of all the new compounds were elucidated on the basis of elemental analysis and spectral data. The antimicrobial activities of the synthesized compounds were screened and the results showed that most of such compounds exhibit considerable activities. Furthermore, some of the newly synthesized compounds were screened for their anticancer activity against human breast cell line (MCF-7) and liver carcinoma cell line (HEPG2) in comparison …
Selective Co Methanation Over Nio--Al_2o_3--Zro_2 And Co_3o_4--Al_2o_3--Zro_2 Catalysts, Fi̇li̇z Derekaya, Derya Ermergen
Selective Co Methanation Over Nio--Al_2o_3--Zro_2 And Co_3o_4--Al_2o_3--Zro_2 Catalysts, Fi̇li̇z Derekaya, Derya Ermergen
Turkish Journal of Chemistry
NiO--Al_2O_3--ZrO_2 and Co_3O_4--Al_2O_3--ZrO_2 catalysts were prepared by three different co-precipitation methods, namely co-precipitation, surfactant-assisted co-precipitation, and surfactant-assisted co-precipitation with ultrasound mixing methods, and their activities were tested in selective CO methanation. Catalysts were characterized using N_2 physisorption, XRD, SEM, TEM, XPS, and TPR-H_2 techniques. CO methanation and selective CO methanation reactions were carried out. Catalysts prepared by surfactant assisted co-precipitation gave high surface area, uniform pore size distributions, and small pores. The NiO--Al_2O_3--ZrO_2 catalyst prepared by surfactant-assisted co-precipitation gave 50% CO conversion to CH_4 at 155 °C and all CO converted to CH_4 when T > 225 °C. For the selective …
Two New Coordination Polymers Containing Dicyanidoargentate(I) And Dicyanidoaurate(I): Synthesis And Characterization, And A Detailed In Vitro Investigation Of Their Anticancer Activities On Some Cancer Cell Lines, Ali̇ Aydin, Ahmet Karadağ, Şaban Teki̇n, Nesri̇n Korkmaz, Aslihan Özdemi̇r
Two New Coordination Polymers Containing Dicyanidoargentate(I) And Dicyanidoaurate(I): Synthesis And Characterization, And A Detailed In Vitro Investigation Of Their Anticancer Activities On Some Cancer Cell Lines, Ali̇ Aydin, Ahmet Karadağ, Şaban Teki̇n, Nesri̇n Korkmaz, Aslihan Özdemi̇r
Turkish Journal of Chemistry
Two novel cyanido-bridged bimetallic polymeric complexes, [Ni(edbea)Ag$_{3}$(CN)$_{5}$]$_{n} $(C1) and [Ni(bishydeten) Au$_{2}$(CN)$_{4}$]$_{n}$ (C2), where edbea = [2,2$' $-(ethylenedioxy)bis(ethylamine)] and bishydeten = [($N$,$N' $-bis(2-hydroxyethyl) ethylenediamine)] are ligands, were synthesized and characterized by elemental, infrared, and thermal measurement techniques and investigated for their biological activity in cultured cancer cell lines. The results show that both compounds and free anions, [Ag(CN)$_{2}$]$^{-}$ and [Au(CN)$_{2}$]$^{-}$, exhibited very high antiproliferative activity compared to the anticancer drug 5FU against the cancer cell lines tested. The antiproliferative and cytotoxic activities of C1 and C2 were significantly lower than those of free anions, indicating that the extreme cytotoxicity of free …
Kinetics Study And Influence Of Water-Soluble Polymer On The Electrodeposition Of Iron From A Citrate-Chloride Electrolyte On The Basis Of Fe(Iii), Vyacheslav Protsenko, Felix Danilov
Kinetics Study And Influence Of Water-Soluble Polymer On The Electrodeposition Of Iron From A Citrate-Chloride Electrolyte On The Basis Of Fe(Iii), Vyacheslav Protsenko, Felix Danilov
Turkish Journal of Chemistry
The kinetics of the iron electrodeposition reaction from a plating bath containing trivalent iron ions is investigated in the present work. The electrochemical reaction is stated to proceed via the formation of relatively stable intermediates: Fe(II) ions. Only a part of the total amount of Fe(II) ions formed at the first stage of Fe(III) discharge is reduced further, producing metal iron. The effect of polyhexamethyleneguanidine hydrochloride (with an average molecular weight of 1000) on the iron deposition is ascertained. The presence of polymer additive in the iron electrolyte appreciably affects the rate of iron deposition, while the polymer additive does …
One-Pot And Solvent-Free Synthesis Of 3-(9-Hydroxy-3-Methoxy-7-Aryl-6,7,9,10-Tetrahydro-5$H$-Benzo[$H$]Thiazolo[2,3-$B$]Quinazolin-9-Yl)-2$H$-Chromen-2-Ones And Their Antibacterial Evaluation, Ravibabu Velpula, Janardhan Banothu, Rajitha Gali, Yakaiah Sargam, Rajitha Bavantula
One-Pot And Solvent-Free Synthesis Of 3-(9-Hydroxy-3-Methoxy-7-Aryl-6,7,9,10-Tetrahydro-5$H$-Benzo[$H$]Thiazolo[2,3-$B$]Quinazolin-9-Yl)-2$H$-Chromen-2-Ones And Their Antibacterial Evaluation, Ravibabu Velpula, Janardhan Banothu, Rajitha Gali, Yakaiah Sargam, Rajitha Bavantula
Turkish Journal of Chemistry
A series of 3-(9-hydroxy-3-methoxy-7-aryl-6,7,9,10-tetrahydro-5$H$-benzo[$h$]thiazolo[2,3-$b$]quinazolin-9-yl)-2$H$-chromen-2-ones (5a-j) were synthesized by one-pot multicomponent reaction of 6-methoxy-1-tetralone, aryl aldehydes, and thiourea followed by cyclization with 3-(2-bromoacetyl)-2$H$-chromen-2-one in the presence of a Bronsted solid acid catalyst, poly(4-vinylpyridinium)hydrogen sulfate [P(4-VPH)HSO$_{4}$] (0.015 g), under solvent-free conditions at 120 $^{\circ}$C. All the synthesized compounds were characterized by spectral studies and screened for their in vitro antibacterial activity against S. aureus and B. thuringiensis (gram positive), and E. coli and K. pneumoniae (gram negative) bacterial strains. On comparing with the standard drug gentamicin, compounds derived from 4-methoxy and 3,4,5-trimethoxy benzaldehyde, i.e. 5g and 5h, showed broad spectrum antibacterial activity …
Green Synthesis Of 2-Amino-7-Hydroxy-4-Aryl-4$H$-Chromene-3-Carbonitriles Using Zno Nanoparticles Prepared With Mulberry Leaf Extract And Zncl$_{2}$, Akbar Mobinikhaledi, Atisa Yazdanipour, Majid Ghashang
Green Synthesis Of 2-Amino-7-Hydroxy-4-Aryl-4$H$-Chromene-3-Carbonitriles Using Zno Nanoparticles Prepared With Mulberry Leaf Extract And Zncl$_{2}$, Akbar Mobinikhaledi, Atisa Yazdanipour, Majid Ghashang
Turkish Journal of Chemistry
A highly efficient and environmentally benign protocol for the synthesis of 2-amino-7-hydroxy-4-aryl-4$H$-chromene-3-carbonitrile derivatives in good to high yields (77%-97%) by one-pot three-component coupling reaction of aromatic aldehydes, malononitrile, and resorcinol under reflux condition was developed in aqueous media using ZnO nanoparticles that were prepared in the presence of mulberry leaf extract under mild conditions.
Synthesis Of Metal-Free And Metallophthalocyanines Containing 18- And 21-Membered Macrocycles With Mixed Donor Atoms And Their Metal-Ion Binding Properties, Hali̇l Zeki̇ Gök
Synthesis Of Metal-Free And Metallophthalocyanines Containing 18- And 21-Membered Macrocycles With Mixed Donor Atoms And Their Metal-Ion Binding Properties, Hali̇l Zeki̇ Gök
Turkish Journal of Chemistry
This paper describes the synthesis of a series of metal-free phthalocyanines and metallophthalocyanines peripherally substituted by macrocycles of different ring sizes with the same donor atom sets. The effects of varying ring size of the macrocycle on the spectroscopic and metal ion binding properties of phthalocyanines were examined. For these purposes, electronic absorption properties for metal-free phthalocyanines and metallophthalocyanines were studied in dimethylformamide and tetrahydrofuran. The liquid-liquid extraction of metal picrates such as Ag(I), Hg(II), Cd(II), Zn(II), Cu(II), Ni(II), Pb(II), and Co(II) from the aqueous phase to the organic phase was carried out using metallophthalocyanines. All new compounds were characterized …
Purification, Refolding, And Characterization Of Recombinant Human Paraoxonase-1, Yeli̇z Demi̇r, Şükrü Beydemi̇r
Purification, Refolding, And Characterization Of Recombinant Human Paraoxonase-1, Yeli̇z Demi̇r, Şükrü Beydemi̇r
Turkish Journal of Chemistry
A high density lipoprotein (HDL)-linked enzyme with antioxidant and antiatherogenic properties, paraoxonase-1(PON1), prevents the formation of atherosclerotic lesions in humans. In the present study, a recombinant hPON1 gene was produced using a small ubiquitin-related modifier (SUMO) fusion protein expression system. To that end, the hPON1 gene was amplified from human liver-ready cDNA, cloned into the expression vector pET SUMO, and expressed in Escherichia coli BL21 (DE3). The predominance of the expressed fusion SUMO-hPON1 protein was inclusion bodies and purified using 6xHis affinity chromatography under natural and denaturing conditions. Subsequently, the enzyme was purified and refolded directly on the affinity matrix …
A Case Study On In Vitro Investigations Of The Potent Biological Activities Of Wheat Germ And Black Cumin Seed Oil, Di̇dem Ağ Şeleci̇, Zi̇nar Pinar Gümüş, Murat Yavuz, Muharrem Şeleci̇, Rebecca Bongartz, Frank Stahl, Hakan Coşkunol, Suna Ti̇mur, Thomas Scheper
A Case Study On In Vitro Investigations Of The Potent Biological Activities Of Wheat Germ And Black Cumin Seed Oil, Di̇dem Ağ Şeleci̇, Zi̇nar Pinar Gümüş, Murat Yavuz, Muharrem Şeleci̇, Rebecca Bongartz, Frank Stahl, Hakan Coşkunol, Suna Ti̇mur, Thomas Scheper
Turkish Journal of Chemistry
The objectives of this study were to investigate the potential biological activities of black cumin seed oil (BCSO) and wheat germ oil (WGO) on different cell lines. Initially, commercially available BCSO and WGO obtained by supercritical carbon dioxide extraction were analyzed in terms of tocopherol, aliphatic alcohols, and thymoquinone content via HPLC and GC analysis. Cell free antioxidant activities and total phenolic content of both oils were detected by DPPH assay and Folin-Ciocalteu method, respectively. As well as the DPPH assay, the protective effect against reactive oxygen species (ROS) was determined by microscopic observation of ROS generation in NIH-3T3 cells …
Enhanced Electrocatalytic Efficiency Of C/Mwnts For Methanol Oxidation Using Ni Deposited On Mwnts, Murat Farsak, Gülfeza Kardaş
Enhanced Electrocatalytic Efficiency Of C/Mwnts For Methanol Oxidation Using Ni Deposited On Mwnts, Murat Farsak, Gülfeza Kardaş
Turkish Journal of Chemistry
The power density of direct methanol fuel cells (DMFCs) can be changed by using different anode materials. Especially porous materials are preferred for the anode. In the present study, multiwall carbon nanotubes were first injected into graphite. Then, by depositing nickel, a catalyst was prepared for use as the anode material of the DMFC. This catalyst was named Ni@MWNTs. The oxidation of methanol and some kinetic parameters were investigated in KOH solution. Cyclic voltammetry was used for the electrochemical measurements. Kinetic parameters of the methanol oxidation were determined at different temperatures, scan rates, and concentrations of methanol. The surface morphologies …
Conversion Of Racemic Allylic Hydroperoxides Into Corresponding Chiral 1/2,3-Triols By Using Catalytic Oso$_{4}$ And Chiral Cinchona Ligands In The Absence Of Co-Oxidant, Haydar Göksu, Mehmet Serdar Gülteki̇n
Conversion Of Racemic Allylic Hydroperoxides Into Corresponding Chiral 1/2,3-Triols By Using Catalytic Oso$_{4}$ And Chiral Cinchona Ligands In The Absence Of Co-Oxidant, Haydar Göksu, Mehmet Serdar Gülteki̇n
Turkish Journal of Chemistry
For the first time, removal of oxygen atoms from allylic hydroperoxide functionality and reintroduction to the double bond was achieved using catalytic OsO$_{4}$ and chiral cinchona alkaloid derivatives in an acetone-water mixture to give corresponding chiral 1/2,3-triol with an enantioselectivity up to 99% ee. The hydroperoxide group was used as both a co-oxidant and a source of hydroxyl groups. This protocol is thought to have potential to provide opportunities for chiral synthesis of 1/2,3-triols from corresponding allylic hydroperoxides in the absence of co-oxidant in one stage for the first time in the literature.
Synthesis Of 5-Aryl-$N$-(Trichloroacetyl)-1,3,4-Oxadiazole-2-Carboxamide Via Three-Component Reaction Of Trichloroacetyl Isocyanate, ($N$-Isocyanimino)Triphenylphosphorane, And Benzoic Acid Derivatives, Nahid Shajari, Ali Reza Kazemizadeh, Ali Ramazani
Synthesis Of 5-Aryl-$N$-(Trichloroacetyl)-1,3,4-Oxadiazole-2-Carboxamide Via Three-Component Reaction Of Trichloroacetyl Isocyanate, ($N$-Isocyanimino)Triphenylphosphorane, And Benzoic Acid Derivatives, Nahid Shajari, Ali Reza Kazemizadeh, Ali Ramazani
Turkish Journal of Chemistry
The three-component reaction of benzoic acid derivatives, ($N$-isocyanimino)triphenylphosphorane, and trichloroacetyl isocyanate in a 1:1:1 ratio in CH$_{3}$CN occurred at room temperature, and the 5-aryl-$N$-(trichloroacetyl)-1,3,4-oxadiazole-2-carboxamide derivatives produced were formed in high yields. The reaction proceeded smoothly and cleanly under mild reaction conditions and no side reactions were observed. The structures of the products were confirmed by IR, $^{1}$H NMR, $^{13}$C NMR, mass spectroscopy, and elemental analysis.
Synthesis Of Novel 1,2,4-Triazoles And Triazolo-Thiadiazines As Anticancer Agents, Thoraya Abd El-Reheem Farghaly, Magda Ahmad Abdallah, Huda Kamel Mmahmoud
Synthesis Of Novel 1,2,4-Triazoles And Triazolo-Thiadiazines As Anticancer Agents, Thoraya Abd El-Reheem Farghaly, Magda Ahmad Abdallah, Huda Kamel Mmahmoud
Turkish Journal of Chemistry
A new series of 7-arylazo-5$H$-3-(trifluoromethyl)-6-methyl-1,2,4-triazolo-[3,4-$b$]-1,3,4-thiadiazines was prepared by reaction of 4-amino-3-trifluoromethyl-5-mercapto-1,2,4-triazoles with $N$-aryl-2-oxo-propane hydrazonoyl chloride in dioxane under reflux in the presence of triethylamine. Furthermore, Schiff bases of 4-amino-5-mercapto-1,2,4-triazole derivatives were reacted with a variety of hydrazonoyl chlorides and gave the respective hydrazonothioates. In addition, the novel \textit{bis}-(1,2,4-triazole-3-thione) was reacted with the appropriate hydrazonoyl chloride in dioxane under reflux in the presence of triethylamine to give the corresponding \textit{bis}-(1,2,4-triazolethiohydrazonoate). The structures of the new compounds were established based on elemental and spectral data. The mechanism of the studied reaction was also discussed. Moreover, some of the new products were screened …
Influence Of Acid And Heavy Metal Cation Exchange Treatments On Methane Adsorption Properties Of Mordenite, Meryem Sakizci, Leyla Özgül Kilinç
Influence Of Acid And Heavy Metal Cation Exchange Treatments On Methane Adsorption Properties Of Mordenite, Meryem Sakizci, Leyla Özgül Kilinç
Turkish Journal of Chemistry
In this study, the adsorption of methane (CH$_{4})$ capacities onto natural mordenite obtained from \.{I}zmir, Turkey, and its cationic forms (CuM, AgM, FeM, and HM samples) were investigated at the temperatures of 0 and 25 $^{\circ}$C up to 100 kPa. Natural and modified samples were characterized by X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared (FT-IR), thermogravimetry (TG-DTG), differential thermal analysis (DTA), scanning electron microscopy (SEM) coupled with energy dispersion spectroscopy (EDS), and N$_{2}$ adsorption methods. Quantitative XRD analysis showed that the major component of the natural zeolite was mordenite, together with minor amounts of quartz, feldspar, and clay …
New Tetrazolic Azo Dyes Linked To (Thio)Barbiturate And Electron-Rich Aromatics As Potential Antimicrobial Agents, Nader Noroozi Pesyan, Davoud Soleimani, Nima Hosseini Jazani
New Tetrazolic Azo Dyes Linked To (Thio)Barbiturate And Electron-Rich Aromatics As Potential Antimicrobial Agents, Nader Noroozi Pesyan, Davoud Soleimani, Nima Hosseini Jazani
Turkish Journal of Chemistry
A series of new tetrazolic azo dyes based on (thio)barbiturate and electron-rich aromatics were synthesized in excellent yield. The electron-donor and tetrazole ring moieties were linked by a $p$-phenylazo bridge and the structural characterizations were achieved by FT IR, $^{1}$H and $^{13}$C NMR, and UV-visible spectrometry. The antibacterial activity of the synthesized compounds was tested against gram-positive and gram-negative bacterial strains, namely \textit{Acinetobacter calcoaceticus} (ATCC23055), \textit{Escherichia coli} (ATCC2592), \textit{Pseudomonas aeruginosa} (ATCC27853), and \textit{Staphylococcus aureus} (ATCC25923). As a result, potential antimicrobial effects were seen for some of the synthesized compounds.
Green And Efficient Synthesis Of Novel Bispyrazoles Through A Tandem Knoevenagel And Michael Type Reaction Using Nanowire Zinc Oxide As A Powerful And Recyclable Catalyst, Khalil Eskandari, Bahador Karami, Saeed Khodabakhshi, Seyyed Jafar Hoseini
Green And Efficient Synthesis Of Novel Bispyrazoles Through A Tandem Knoevenagel And Michael Type Reaction Using Nanowire Zinc Oxide As A Powerful And Recyclable Catalyst, Khalil Eskandari, Bahador Karami, Saeed Khodabakhshi, Seyyed Jafar Hoseini
Turkish Journal of Chemistry
Zinc oxide nanowires (ZnO NWs) were prepared and characterized by scanning electron microscopy, powder X-ray diffraction, and transmission electron microscopy analyses. ZnO NWs were then employed as heterogeneous and recyclable catalyst for green synthesis of some new and known bispyrazole derivatives through a tandem Knoevenagel and Michael type addition reaction of aromatic aldehyde and pyrazolone. The synthetic method is operationally simple and affords product with high yields in short reaction times.
Cross Coupling Reactions Catalyzed By (Nhc)Pd(Ii) Complexes, Nevi̇n Gürbüz, Emi̇ne Özge Karaca, İsmai̇l Özdemi̇r, Beki̇r Çeti̇nkaya
Cross Coupling Reactions Catalyzed By (Nhc)Pd(Ii) Complexes, Nevi̇n Gürbüz, Emi̇ne Özge Karaca, İsmai̇l Özdemi̇r, Beki̇r Çeti̇nkaya
Turkish Journal of Chemistry
This review is focused on new developments reported during the last 3 years concerning the catalytic performances of in situ formed or preformed NHC--Pd(II) complexes (NHC: $N$-heterocyclic carbene) for cross-coupling reactions such as Heck--Mizoraki (often shortened to the Heck reaction), Kumada, Negishi, Suzuki--Miyaura (often shortened to the Suzuki reaction), Sonogashira and Hiyama couplings, and the Buchwald--Hartwig aminations, which are extremely powerful in the formation of C--C and C--heteroatom bonds. Due to the great number of publications and limited space here, we made a special attempt to compile the relevant data in tables, which we hope will serve as a guide …
Palladium-Catalysed Suzuki--Miyaura Cross-Coupling With Imidazolylidene Ligands Substituted By Crowded Resorcinarenyl And Calixarenyl Units, Neslihan Sahin, David Semeril, Eric Brenner, Dominique Matt, Cemal Kaya, Loic Toupet
Palladium-Catalysed Suzuki--Miyaura Cross-Coupling With Imidazolylidene Ligands Substituted By Crowded Resorcinarenyl And Calixarenyl Units, Neslihan Sahin, David Semeril, Eric Brenner, Dominique Matt, Cemal Kaya, Loic Toupet
Turkish Journal of Chemistry
Two $N$-heterocyclic carbene (NHC) palladium complexes of formula [PdBr$_{2}$(NHC)(pyridine)] in which the carbenic ring is flanked by sterically crowded cavitand substituents were prepared from appropriate imidazolium salts bearing either two resorcinarene or a combination of resorcinarene and calixarene fragments. Both complexes displayed high stability and good activities in the cross-coupling of aryl bromides with phenyl boronic acid. One of the imidazolium salts was characterised by an X-ray diffraction study.
Synthesis Of New Thiol-Derivatized Aminophosphines And Their Catalytic Activities In C--C Coupling Reactions, Nermi̇n Bi̇ri̇ci̇k, Nermi̇n Meri̇ç, Cezmi̇ Kayan, Zeynep Özgen, Sevi̇l Şeker Azi̇zoğlu, Bahatti̇n Gümgüm
Synthesis Of New Thiol-Derivatized Aminophosphines And Their Catalytic Activities In C--C Coupling Reactions, Nermi̇n Bi̇ri̇ci̇k, Nermi̇n Meri̇ç, Cezmi̇ Kayan, Zeynep Özgen, Sevi̇l Şeker Azi̇zoğlu, Bahatti̇n Gümgüm
Turkish Journal of Chemistry
A series of new aminophosphines [Ph$_{2}$PHN-C$_{6}$H$_{4}$-R, where R = $o$-SH (4a), $m$-SH (4b) or $p$-SH (4c)] were readily synthesized from cheap starting materials by the phosphorylation reaction of $o$, $m$, and $p$-aminothiophenols with Ph$_{2}$PCl in the presence of triethyl amine. The new compounds were characterized by NMR and IR spectroscopy and microanalysis. In addition, aminophosphine ligands-palladium systems were investigated as precatalysts in C-C coupling reactions. Compounds 4b and 4c were proved to be excellent catalysts for Suzuki and Heck cross-coupling reactions.
Pfam Catalyzed Enantioselective Diethylzinc Addition To Imines, Özdemi̇r Doğan, Eda Çağli
Pfam Catalyzed Enantioselective Diethylzinc Addition To Imines, Özdemi̇r Doğan, Eda Çağli
Turkish Journal of Chemistry
Chiral amines are important starting materials for the synthesis of biologically important compounds. Enantioselective addition of dialkylzinc reagents to imines is a reliable method for the synthesis of these compounds. Different chiral catalysts were developed and used for this method. Phosphorous based PFAM catalysts were tried for the first time in the enantioselective synthesis of amines by reacting diethylzinc with N-sulfonyl imines and N-diphenylphosphinoyl imines. Chiral amines were isolated with moderate to acceptable yields and enantioselectivities.