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Öğe 1,4,5,6-tetrahydropyrimidinium halides ligands for Suzuki-Miyaura cross-coupling of unactivated aryl chlorides(2005) Alici B.; Özdemir I.; Gürbüz N.; Çetinkaya E.; Çetinkaya B.Four functionalized bis(1,4,5,6-tetrahyropyrimidinium) salts (2a-d) have been prepared and characterized by conventional spectroscopic methods and elemental analyses. A highly effective, easy to handle and environmentally benign process for palladium mediated Suzuki cross-coupling was developed. The in situ prepared three component system Pd(OAc)2 / bis(1,4,5,6-tetrahyropyrimidinium) bromides (2a-d) and Cs2CO 3 catalyses quantitatively the Suzuki cross-coupling of deactivated aryl chloride.Öğe Benzimidazole, benzothiazole and benzoxazole ruthenium(II) complexes; catalytic synthesis of 2,3-dimethylfuran(Wiley-VCH Verlag, 2000) Çetinkaya B.; Özdemir I.; Bruneau C.; Dixneuf P.H.Fourteen ruthenium(II) complexes of the type [RuCl2(?6-arene)L], (arene = 1,4-MeC6H4Pr(i) or C6Me6; L = benzimidazole derivative in which the NH group is substituted by N-alkyl or isoelectronic O or S atoms) have been prepared by cleavage of [RuCl2(?6-arene)]2 with the N-heterocycle L. Their spectroscopic and electrochemical properties are described. The effect of the nature of the benzazole (L) on the catalytic activity of these complexes for the intramolecular cyclization of (Z)-3-methylpent-2-en-4-yn-1- ol into 2,3-dimethylfuran has also been studied; the benzimidazole complexes were found to be the most active.Öğe Catalytic double addition of diazo compounds to alkynes: Synthesis of functional conjugated dienes [8](2000) Le Paih J.; Dérien S.; Özdemir I.; Dixneuf P.H.[No abstract available]Öğe Crystal structure of dichloro-N-(3,4,5-trimethoxy-benzyl)-N-(n-butyl) -imidazolidin-2-ylideneruthenium(II), RuCl2(C17H 26N2O3)(2004) Arslan H.; Vanderveer D.; Özdemir I.; Cetinkaya B.; Demir S.C17H26Cl2N2O3Ru, monoclinic, P121/n (no. 14), a = 10.180 (1) Å, b= 11.985(1) Å, c = 16.017(2) Å, ?= 106.419(2)°, V= 1874.5 A? 3, Z = 4, Rgt(F) = 0.037, wRref(F2) = 0.109, T= 193 K. © by Oldenbourg Wissenschaftsverlag, München.Öğe Crystal structure of dichloro-N-(3,4,5-trimethoxy-benzyl)-N-(n-butyl)]- imidazolidin-2-ylideneruthenium(II), RuCl2(C17H26N2O3)(2004) Arslan H.; Vanderveer D.; Özdemir I.; Cetinkaya B.; Demir S.C17H26Cl2N2O3RU, monoclinic, P121/n1 (no. 14), a = 10.180(1) Å, b= 11.985(1) Å, c = 16.017(2) Å, ß = 106.419(2)°, V= 1874.5 Å3, Z = 4, Rgt(F) = 0.037, wRref(F2) = 0.109, T = 193 K. © 2004, Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München. All rights reserved.Öğe Dichloride[1-(2,4,6-trimethylbenzyl)-3-(biphenyl-2-ylmethyl) -imidazolidin-2-ylidine (?6-hexamethylbenzene)]ruthenium(2006) Arslan H.; Van Derveer D.; Özdemir I.; Yaşar S.; Çetinkaya B.The single crystal X-ray structure of the imidazolidin ruthenium complex, C38H46N2Cl2Ru, was determined. The complex is an orthorhombic space group Pbca with a = 17.3586(32) Å, b = 14.4447(27) Å, c = 27.4325(52) Å, and V = 6878.466(4) Å3 with Z = 8 for Dcalc = 1.357 g/cm3. It exhibits the expected 3-legged piano stool geometry. There is one coordination bond of the ruthenium atom with the electrons of the ?6-hexamethylbenzene, 2 symmetrical Ru-Cl bonds, and one Ru-C bond involving the imidazole ring. The coordination around the ruthenium atom is 4-fold, which in this is case is pseudo-tetrahedral. © TÜBİTAK.Öğe An effcient ligand-free method for the transfer hydrogenation of ketones and aldehydes catalyzed by different complexes(2013) Yaşar S.; Çekirdek S.; Taş N.A.; Yildirim S.; Özdemir I.A very effcient ligand-free method was developed for the transfer hydrogenation of ketones and aldehydes catalyzed by different metal complexes. With this catalytic system, the catalytic performance and catalytic stability of different Ir, Ru, and Pd complexes were more favorable than those of the previously reported systems for transfer hydrogenation. This ligand-free catalytic system showed good stability and excellent activity even with lower catalyst concentrations for the ketones and aldehydes tested. © TÜBITAK.Öğe In situ preparation of palladium / N-heterocyclic carbene complexes and use for Suzuki reaction(HeteroCorporation, 2005) Özdemir I.; Gök Y.; Gürbüz N.; Çetinkaya E.; Çetinkaya B.The in situ prepared three component system Pd(OAc)2, 1,3-dialkylbenzimidazolium halides (1a-e) and t-BuOK catalyses quantitatively the Suzuki cross-coupling of deactivated aryl chloride substrates. 1,3-Dialkylbenzimidazolium salts (1a-e) were characterized by conventional spectroscopic methods and elemental analyses.Öğe On some relations among the solutions of the linear volterra integral equations with convolution kernel(2012) Özdemir I.; Temizer Ö.F.The sufficient conditions for y1(x) ? y2(x) were given in [1] such that ym(x) = CMEX10.-1.integraltext fm(x) + ? x a Km(x, t)ym(t)dt, (m = 1, 2) and x ? [a, b]. Some properties such as positivity, boundedness and monotonicity of the solution of the linear Volterra integral equation of the form CMEX10.-1.integraltext t - f(t) = 1 - ? t 0 K(t - ?)f(?)d? = 1 - K f, (0 ? t < ?) were obtained, without solving this equation, in [3, 4, 5, 6]. Also, the boundaries for functions f', f'',.., f(n), (n ? N) defined on the infinite interval [0, ?) were found in [7, 8]. In this work, for the given equation f(t) = 1 - K * f and n ? 2, it is derived that there exist the functions L2, L3,.., Ln which can be obtained by means of K and some inequalities among the functions f, h2, h3,.., hi for i = 2, 3,.., n are satisfied on the infinite interval [0, ?), where hi is the solution of the equation hi(t) = 1 - Li * hi and n is a natural number. © 2012 Austral Internet Publishing.Öğe Surface modification of inorganic oxide particles with a carbene complex of palladium: A recyclable catalyst for the Suzuki reaction(Springer New York LLC, 2004) Gürbüz N.; Özdemir I.; Seçkin T.; Çetinkaya B.The reaction of 1-(2,4,6-trimethylbenzyl)-3-(propyltriethoxysilane) imidazolidinium chloride, with the Pd(OAc)2 complex proceeded smoothly in DMSO to give the bis[1-(2,4,6-trimethylbenzyl)-3- (propyltriethoxysilane)imidazolidin-2-ylidene]dichloropalladium(II) complex that was grafted onto the surface of amorphous silica. The effects of various factors, such as reaction temperature and time, on the grafting efficiency was evaluated. Inorganic oxide particles that were modified with a carbene complex of palladium(II) were tested for catalytic activity in the Suzuki coupling reaction between phenylboronic acid and several aryl halides © 2004 Plenum Publishing Corporation.Öğe Synthesis of ruthenium(II) N-heterocyclic carbene complexes and their catalytic activities in transfer hydrogenation of ketones(2012) Yig?it B.; Yig?it M.; Özdemir I.; Çetinkaya E.Three RuCI 2(? 6-arene, ? 1-carbene) and two RuCI 2(NHC)(arene) complexes have been prepared by the reaction of bis(1,3-dialkylperhydrobenzimidazol-2-ylidene) (1) and bis(1,3-dialkyl-4-methylzimidazolin-2-ylidene) (3) with [RuCI 2(arene)] 2 in toluene and characterized by elemental analysis, 1H NMR, 13C NMR and IR spectroscopy. The catalytic activities of these complexes were examined in the transfer hydrogenation of aromatic ketones using 2-propanol as hydrogen source. © Springer Science+Business Media B.V. 2012.
