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Öğe 1,1?,3,3?-tetraalkyl-2,2?-biperimidinylidenes(John Wiley & Sons Inc, 2003) Alici, B; Hökelek, T; Çetinkaya, E; Çetinkaya, BC-2 deprotonation of 1,3-dibutylperimidinium bromide (1a) with sodium hydride and a catalytic amount of potassium tert-butoxide in dry THF led to the formation of the exceptionally inert tetraaminoalkene 2a. In contrast, isostructural tetrakis(2-methoxyethyl)-tetraaminoalkene (2b) instantaneously reacted with O-2 to yield urea 3b, and silver nitrate was readily reduced with 2b to form a silver mirror. Compound 2a has been characterized by X-ray diffraction studies; the naphtho-pyrimidine skeleton imposes structural constraints and some rigidity to the C=C bonding. (C) 2003 Wiley Periodicals, Inc.Öğe 1,4,5,6-tetrahyropyrimidinium halides ligands for Suzuki-Miyaura cross-coupling of unactivated aryl chlorides(Pergamon-Elsevier Science Ltd, 2005) Alici, B; Özdemir, I; Gürbüz, N; Çetinkaya, E; Çetinkaya, BFour 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 CS2CO3 catalyses quantitatively the Suzuki cross-coupling of deactivated aryl chloride.Öğe 2-imidazoline and 1,4,5,6-tetrahydropyrimidine-ruthenium(II) complexes and catalytic synthesis of furan(Elsevier Science Sa, 1999) Çetinkaya, B; Alici, B; Özdemir, I; Bruneau, C; Dixneuf, PHThe complexes RuCl2(L-1)(arene) (3-4) (L1 = HC=NCH2CH2NR, R = Et, arene = p-MeC6H4CHMe2 or C6Me6) and RuCl2(L-2)(arene) (5-6) (L-2 = HC=NCH2CH2CH2NR, R = Me; Ph, CH2Ph, p-MeC6H4) have been synthesized by reaction of [RuCl2(arene)](2), with 1-alkyl-2-imidazoline (1) or 1-alkyl-1,4,5,6-tetrahydropyrimidine (2). In each of these complexes (3-6) the ligand is bound via the imine (N=C) nitrogen atom. The new complexes are capable of catalyzing the activation of (2)-3-methylpent-2-en-4-yn-1-ol into 2,3-dimethylfuran in very good yield, via intramolecular cyclization, and the 1,4,5,6-tetrahydropyrimidine complexes 5 and 6 appeared to be the best catalyst precursors. Cyclic voltammetry shows that the nature of the arene ligand, rather than that of the nitrogen containing ligand, controls the electron-richness of the complexes. (C) 1999 Elsevier Science Ss.A. All rights reserved.Öğe In situ generated palladium catalysts bearing 1,3-dialkylperimidin-2-yline ligands for Suzuki reactions of aryl chlorides(Elsevier, 2004) Özdemir, I; Alici, B; Gürbüz, N; Çetinkaya, E; Çetinkaya, BFour new 1,3-dialkylperimidinium halides have been prepared and characterized. The in situ prepared three component system Pd(OAc)(2)/1,3-dialkylperimidinium (1a-d) and Cs2CO3 catalyses the Suzuki cross-coupling of deactivated aryl chloride substrates in excellent yields under mild conditions. (C) 2004 Elsevier B.V. All rights reserved.Öğe New derivatives of benzimidazole and their antimicrobial activity(E I F T Srl, 1999) Cetinkaya, E; Alici, B; Gök, Y; Durmaz, R; Günal, SAzolium salts and neutral 2-aryl derivatives of benzimidazole, benzothiazole and benzoxazole were synthesized and compounds were identified by H-1 and C-13 NMR spectroscopy and microanalytical methods. In this work the salts I and the neutral compounds 2 were evaluated for their in vitro antimicrobial activity against standard strains: Enterococcus faecalis (ATCC 29212), Staphylococcus aureus (ATCC 29213), Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853), Candida albicans and Candida tropicals. The compounds If, Ig, Il, Im, In, 2a, 2b, 2c, 2e, 2f showed antimicrobial activity against Enterococcus faecalis (ATCC 29212), Staphylococcus aureus (ATCC 29213), Escherichia coli (ATCC 25922), Pseudomonas aeruginosa (ATCC 27853), Candida albicans and Candida tropicals, with minimum inhibitory concentrations (MICs) ranging between 50 to 200 mu g/mL. Compounds If, Ig, 11, Im, 2b, 2e showed the highest activity. Benzothiazolium and benzoxazolium salts were more active than 1,3-disubstituted benzimidazolium salts and neutral 2-substituted benzimidazole, benzothiazole and benzoxazole derivatives.Öğe Synthesis and catalytic properties of 1-alkylperimidineruthenium (II) complexes(Elsevier, 2005) Alici, B; Özdemir, I; Karaaslan, K; Çetinkaya, E; Çetinkaya, BFour new [RuCl2(perimidine)(p-cymene)] complexes have been prepared and characterized. Upon reaction with 1,1-diphenylprop-2-yn-1-ol they generate catalyst precursors. which perform the cycloisomerization of diallyltosylamide into N-tosyl-alpha-methylenepyrrolidine. (c) 2005 Elsevier B.V. All rights reserved.Öğe Synthesis and catalytic properties of arene complexes of ruthenium(II) prepared from Si, Zr, Ti and Al alkoxides by the sol-gel process(Royal Soc Chemistry, 1998) Cetinkaya, B; Seckin, T; Ozdemir, I; Alici, BMethods of synthesizing materials for catalysis were developed by synthesizing eta-arene complexes of ruthenium(II) coordinated to vinylpyridine that was followed by sol-gel polymerization with 3-methacryloxypropyltriethoxysilane. To enforce sufficient catalytic properties, a series of hybrid materials from Si, Zr, Ti and Al alkoxides were prepared by co-condensation. The hydrolysis and polycondensation of materials were performed at different experimental conditions. The monomeric compounds were identified and catalytic activities were tested for cyclization of (Z)-3-methylpent-2-en-4-yn-1-ol to 2,3-dimethylfuran.Öğe Synthesis and characterization of N-substituted 1,4,5,6-tetrahydropyrimidine containing functional polymers as SO2 and CO2 sorbents(John Wiley & Sons Inc, 1997) Seckin, T; Alici, B; Cetinkaya, E; Ozdemir, INovel vinyl monomers containing 1,4,5,6-tetrahydropyrimidine were prepared by the reaction of N-substituted-1,3-diaminopropane with N,N-dimethyl-formamide dimethylacetal, which gave l-alkyl or aryl substituted 1,4,5,6-tetrahydropyrimidines, Alkylation of the tetrahydropyrimidine derivatives by chloromethylstyrene produces the N-methyl-N'-vinyl benzyl-1,4,5,6-tetrahydropyrimidinium chloride in high yields, These monomers were readily polymerized in dimethylformamide by AIBN at 80 degrees C. Homopolymers and soluble linear copolymers were prepared and copolymerization parameters were rationalized. Further, insoluble terpolymers prepared from these monomers, styrene and divinylbenzene were tested for the sorption of the weakly acidic gases gave excellent results. (C) 1997 John Wiley & Sons, Inc.Öğe Synthesis and characterization of novel polyimides starting from 1,2-bis(p-dimethylaminobenzylideneimino)alkane homologues and various dianhydrides(Wiley, 2004) Koytepe, S; Gök, Y; Alici, B; Seçkin, T; Çetinkaya, EThe objective of this research was the preparation of polyimides from 1,2-bis(p-dimethylaminophenylimino)alkane homologues and various dianhydrides in N-methylpyrrolidone by one-stage polycondensation. The monomers were prepared via condensation of p-dimethylaminobenzaldehyde and the corresponding diamines, 1,4-diaminobutane, 1,3-diaminopropane and 1,2-diaminoethane. The influence of the incorporation of this moiety into the polymer backbone on the properties of the polyimides has been evaluated. The thermogram of the polyimides indicated that PI-10 to PI-32 had T-g values ranging from 181 to 290degreesC. The inherent viscosities of the polymers ranged from 0.99 to 2.05 dl g(-1), and the highest solubility was obtained without significant loss of the thermal properties. (C) 2004 Society of Chemical Industry.Öğe A synthesis and properties of 1-substituted 1,4,5,6-tetrahydropyrimidines(Pergamon-Elsevier Science Ltd, 1997) Alici, B; Cetinkaya, E; Cetinkaya, BThe condensation of 1-substituted 1,3-diaminopropane with N,N-dimethylformamide dimethylacetal gives 1-alkyl- or aryl-1,4,5,6-tetrahydropyrimidines (2) and (3). Alkylation of the tetrahydropyrimidine derivatives with alkyl halides produces the 1,3-dialkyltetrahydropyrimidinium salts (4 and 5). The attempted dehydrogenation of 2 with sulfur leads to insertion of sulfur on the molecule.Öğe Synthesis and radical polymerization of 2-(vinylbenzylmercapto) heterocyclic salts(Vsp Bv, 1999) Çetinkaya, E; Seçkin, T; Alici, BHeterocyclic group-containing vinyl monomers, 2-(vinylbenzylmercapto) heterocyclic salts, were synthesized and their polymerization and copolymerization with styrene were investigated. Cyclic thioureas incorporating imidazoline, hexahydropyrimidine and benzimidazole nuclei were alkylated by chloromethyl styrene to give quaternary salts that were used as monomers. Homopolymerization of the monomers afforded mainly soluble polymers on high dilution. In the copolymerization with styrene, an alternating nature was suggested from the copolymerization parameters obtained by either the Finemann-Ross method or the Mao-Huglin method. A decrease in alternating copolymerizability was demonstrated.Öğe Synthesis of Pd(II) 1-alkylperimidine complexes as efficient catalysts for Suzuki reactions involving arylchlorides(Pleiades Publishing Inc, 2005) Özdemir, I; Alici, B; Gürbüz, N; Çetinkaya, B; Çetinkaya, EThree palladium(II) complexes of the type [PdCl2(PPh3)L] (L-1-alkylperimidine) have been prepared by reactions of [PdCl2(PR3)]2 with 1-alkylperimidine. The complexes were characterized by conventional spectroscopic methods and elemental analyses. The incorporation of N-coordinated perimidine complexes of palladium(II) gave high catalytic activity in the Suzuki coupling deactivated aryl chloride substrates.Öğe Synthesis of tetraaminoalkenes containing the reduced pyrimidine skeleton and the x-ray molecular structure of 1,1'-ethylene-3,3'-dibenzylbi(hexahydropyrimidin-2-ylidene)(Royal Soc Chemistry, 1996) Alici, B; Cetinkaya, E; Cetinkaya, B; Ulku, D; Tahir, MNDeprotonation of a 1,1'-bridged bis(1,3-diaikyl-1,4,5,6-tetrahydropyrimidinium) diiodide with NaH gives in high yield a tetraaminoalkene 4, whereas the corresponding non-bridged tetrahydropyrimidinium iodide reacts with NaH only in the presence of KOBu; the title bridged tetraaminoalkene 4f was structurally characterized by single-crystal X-ray diffraction.
