14 research outputs found
Unprecedented formation of a μ -oxobridged polymeric copper(II) complex: Evaluation of catalytic activity in synthesis of 5-substituted 1 H -tetrazoles
No full textThe reaction of CuCl2·2H2O with Schiff base ligand, 4-[(2-hydroxy-3-methoxybenzylidene)amino-1,5-dimethyl-2-phenyl-1H-pyrazol-3-one] (hmdpH), in 1:1 molar ratio led to a novel and unprecedented oxo-bridged polymeric copper (II) complex, [Cu(μ-O) (hmdp)]n. The complex was isolated as crystalline solid and characterized by FTIR, UV–visible and EPR spectroscopic techniques. The molecular structure of the complex was also determined by single crystal X-ray diffraction studies. The formation of the complex is unique and unprecedented in the sense that one of the CH3 group of the 4-aminoantipyrene unit of the Schiff base ligand is oxidized in situ to CH2OH, during the complex formation. The catalytic potential of the complex has been demonstrated in the synthesis of a series of 5-substituted 1H-tetrazoles via [3 + 2]-cycloaddition reactions of substituted benzonitriles and sodium azide in ethylene glycol
Palladium nanoparticles immobilized on a magnetic chitosan-anchored Schiff base: applications in Suzuki–Miyaura and Heck–Mizoroki coupling reactions
No full textA palladium nanocatalyst Fe3O4@CS-SB-Pd has been synthesized and characterized by FT-IR, XRD, XPS, FESEM, EDX, TEM, TGA, and ICP-AES analysis.</p
Chitosan-Supported Copper(II) Schiff Base Complexes: Applications in Synthesis of 5-Substituted 1H-Tetrazoles and Oxidative Homo-Coupling of Terminal Alkynes
No full textSynthesis and characterization of a new Pd(II)-Schiff base complex [Pd(APD) 2 ]: An efficient and recyclable catalyst for Heck-Mizoroki and Suzuki-Miyaura reactions
No full textSynthesis and crystal structures of salen-type Cu(II) and Ni(II) Schiff base complexes : application in [3+2]-cycloaddition and A3-coupling reactions
No full textThe synthesis of two new salen-type Schiff base complexes of the type [Cu(L)]·0.5H2O, 1, and [Ni(L)], 2, from the reaction of a 6,6′-[(1E,1′E)-(cyclohexane-1,2-diylbis(azanylylidene))bis(methanylylidene)bis(3-(diethylamino)phenol)] salen-type Schiff base ligand (H2L) with Cu(OAc)2·H2O and Ni(OAc)2·4H2O in methanol at room temperature, respectively, is described. The complexes are isolated as coloured crystalline solids and characterized by elemental analysis, FT-IR spectroscopy, UV-visible spectroscopy and single crystal X-ray diffraction studies. The paramagnetic nature of complex 1, having giso = 2.076, was confirmed by EPR studies, which indicated a distorted square planar geometry of the complex. In contrast to this, the nickel complex was found to be diamagnetic in nature and it was additionally characterized by 1H NMR. The crystal structures of complexes 1 and 2 confirm the distorted square planar geometry of both the complexes. Complex 1 was found to be a better catalyst for the synthesis of a series of 5-substituted 1H-tetrazoles from nitriles and sodium azide via [3+2]-cycloaddition and for the A3-coupling reaction of aldehydes, secondary amines and terminal alkynes with a low catalyst loading (0.7 and 0.9 mol%, respectively) as compared to complex 2. Complex 1 is novel in the sense that, being a homogeneous catalyst, it can be recovered almost quantitatively in both reactions and recycled up to four times to afford good yields of the corresponding products
A Micronarrative Approach to CONCLUSION in Zakaria Tamer's Very Short Story
No full textResim, roman, kaside veya öykü fark etmeksizin birçok sanat, sanat eserinin oluşturulma biçiminde benzerlik arz eder. Sanatların ortak yönlerinden birisi de eserin tamamlanması anlamında kullanılan “ressamın son fırça darbeleri”dir. Kısa hikayelerden söz etmişken, “Kaplanlar onuncu günde” isimli öykünün yazarının Suriye’deki kısa hikâyenin ana direklerinden ve öncülerinden biri olduğunu vurgulamamız yerinde olacaktır. Zekeriyya Tamer aynı zamanda Arapların diğer anlatı türlerine göre daha az ilgilendiği çocuk hikayeleri hususunda belki de tartışmasız olarak en öne çıkan isimlerdendir. Zekeriyya Tamer’in anlatılarının gördüğü genel kabul, bunu sadeliğine, akıcılığına ve yapısal bileşenlerinin hikâye anlatımında bilinen giriş, karmaşık gövde içeriği ve sonuçtan oluşan unsurlara dayandığı tutarlı ve uyumlu örgüsüne borçludur. Anlatı mimarisi ve özellikle sonuçlandırma kısmı üzerinde durmamız, belki de bizi Zekeriyya Tamer’deki eşsiz sanatla baş başa bırakacaktır. Makalede Zekeriyya Tamer’in öykülerinde metne giriş ve sonuç kısmındaki muazzam yorum işlevi olan kısa hikâyenin sonucun mikroanlatısal tenkidinin amacı da budur. Onun bu manadaki çalışmaları bazen okuyucunun hayal gücüne ufuklar açarken bazen de yönlendirilmesi gereken okuyucuyu yönlendirmektedir. Bu makale Zekeriyya Tamer’in bazı hikayelerinin sonunu seçilmiş örnekler üzerinden mercek altına almaya çalışmıştır. Bu örneklerin tam olarak onun tarzı olduğunu iddia etmiyoruz. Ancak sanat dünyasında ifade edildiği gibi üslup insanın kendisidir. Dolayısıyla tarz ve kullanılan dili kişinin kendisiyle ilgili ipuçları verdiği söylenebilir.Regardless of painting, novel, eulogy or story, many arts are similar in the way a work of art is created. One of the common aspects of the arts is the "last brush strokes of the painter", which is used to mean the completion of the work. Speaking of short stories, it would be appropriate to emphasize that the author of the story "Tigers on the tenth day" is one of the main pillars and pioneers of the short story in Syria. Zekeriyya Tamer is also perhaps one of the most prominent names in children's stories, which Arabs are less interested in than other narrative genres. The general acceptance of Zekeriyya Tamer's narratives owes this to its simplicity, fluency, and its consistent and harmonious weave, in which its structural components are based on the familiar introductory, complex body content and concluding elements in storytelling. Focusing on the narrative architecture and especially the concluding part will perhaps leave us alone with the unique art of Zekeriyya Tamer. This is the purpose of the micronarrative critique of the conclusion of the short story, which has a tremendous commentary function in the introduction to the text and the conclusion in Zekeriyya Tamer's stories in the article. His works in this sense sometimes open horizons to the imagination of the reader, and sometimes direct the reader who needs to be guided. This article has tried to scrutinize the endings of some of Zekeriyya Tamer's stories through selected examples. We do not claim that these examples are exactly his style. However, as expressed in the art world, style is the person himself. Therefore, it can be said that the style and the language used give clues about the person himself
Carbonylative Suzuki coupling reactions catalyzed by ONO pincer–type Pd(II) complexes using chloroform as a carbon monoxide surrogate
No full text[Zn(l-proline)2] Catalyzed One-Pot Synthesis of Propargylamines Under Solvent-Free Conditions
No full textSynthesis, characterization and crystal structure of Cu(II) complex of trans-cyclohexane-1,2-diamine: Application in synthesis of symmetrical biaryls
No full textA new Cu(II) complex [Cu(cyhxn)2(H2O)2][OTf]2 was synthesised by the reaction of ligand cyhxn (cyhxn = trans-cyclohexane-1,2-diamine) with Cu(OTf)2 in methanol at room temperature. The complex was fully characterized by elemental analysis (CHN), FT-IR, UV–Vis and EPR spectroscopic techniques. The structure of the complex was confirmed by single crystal X-ray diffraction study. The EPR spectrum is isotropic type having, which indicates a distorted octahedral geometry of the complex. The complex was found to be an active homogeneous catalyst for the homocoupling reactions of arylboronic acid to obtain symmetrical biaryls at room temperature in methanol without the use of any additives such as a base and or an oxidanAccepted versio
