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Öğe (1E,3Z,5E)-2,5-diaza-1,6-bis(dimethylamino)-1,3,5-hexatriene-3,4-dicarbonitrile(Int Union Crystallography, 1996) Kucukbay, H; Cetinkaya, E; Ulku, D; Tahir, MNThe title structure consists of discrete C10H14N6 molecules which have a cis configuration and an extended conjugation. The molecules are slightly distorted from planarity.Öğe Antimicrobial activity of carbene complexes of rhodium(I) and ruthenium(II)(Ecv-Editio Cantor Verlag Medizin Naturwissenschaften, 1996) Cetinkaya, B; Cetinkaya, E; Kucukbay, H; Durmaz, RTwenty-four carbene-rhodium(I), carbene-ruthenium(II) complexes and related compounds were evaluated for their in vitro antimicrobial activity against the Cram-positive bacteria Enterococcus faecalis (ATCC 29212) and Staphylococcus aureus (ATCC 29213) and Gram-negative bacteria Escherichia coli (ATCC 25922), Pseudmonas aeruginosa (ATCC 27853).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 Preparation and X-ray structure of bis(1-methyl-3-ethylbenzimidazolidine-2-ylium) tetrafluoroborate(R Oldenbourg Verlag, 1998) Aydin, A; Soylu, H; Gunes, B; Akkurt, M; Ercan, E; Kucukbay, H; Cetinkaya, EThe title compound, C20H24B2F8N4, crystalises monoclinic (space group C2, Z = 4, a = 23.797(5) Angstrom, b = 8.330(2) Angstrom, c = 11.471(2) Angstrom, beta = 90.17(2)degrees. R = 0.084 for 1922 [1 greater than or equal to 2 sigma(I)]. The most notable features are the values of the C-C bond length [1.47(1) Angstrom], of the adjacent endocyclic N-C bond length [1.363(1) Angstrom] the torsion angle about the central C-C bond [83 degrees] and the nearly trigonal planar environment of the nitrogen atom.Öğe Reactions of electron-rich olefins with proton-active compounds(Marcel Dekker Inc, 1997) Kucukbay, H; Cetinkaya, E; Cetinkaya, B; Lappert, MFFrom the reaction of electron-rich olefins, bis(1,3-dimethylbenzimidazolidine-2-ylidene), I, or bis(3-methylbenzothiazolidine-2-ylidene), LI with proton active compounds, such as dimethyl phosphite, diethyl phosphite, acetonitrile and benzaldehyde were obtained 2-substituted benzimidazole or benzothiazole derivatives. The compounds synthesized were identified by H-1, C-13, P-31-NMR, mass, FT-LR spectroscopic techniques and micro analysis.Öğe Synthesis and antimicrobial activity of electron rich olefin derived cyclic ureas(Ecv-Editio Cantor Verlag Medizin Naturwissenschaften, 1996) Cetinkaya, B; Cetinkaya, E; Kucukbay, H; Durmaz, RSeventeen cyclic ureas containing imidazolidine and benzimidazoline nuclei were synthesised by the reaction of electron-rich olefins with appropriate group 16 elements (O, S, Se, Te). The compounds synthesised were identified by H-1, C-13-NMR, FT-IR and mass spectroscopic techniques and micro analysis. All compounds studied in this work were screened for their in vitro antimicrobial activity against standard strains: Enterococcus faecalis (ATCC 29212), Staphylococcus aureus (ATCC 29213), Escherichia coli (ATCC) 25922) and Pseudomonas aeruginosa (ATCC 27853). Eight of the compounds were found effective to inhibit the growth of Gram-positive bacteria (Enterococcus Faecalis and Staphylococcus aureus) at MIC values between 25-400 mu g/ml. None of the compounds exhibit antimicrobial activity against gram-negative bacteria (Escherichia coli; and Pseudmonas aeruginosa) at the concentrations studied (6.25-800 mu g/ml).Öğe Synthesis and antimicrobial activity of substituted benzimidazole, benzothiazole and imidazole derivatives(Ecv-Editio Cantor Verlag Medizin Naturwissenschaften, 1995) Kucukbay, H; Cetinkaya, E; Durmaz, RNew benzimidazole, benzothiazole and imidazole derivatives were synthesized by reacting electron-rich olefins (5, 23 and 29) with appropriate reagents The compounds synthesized were identified by H-1, C-13-NMR, FT-IR and mass spectroscopic techniques and micro analysis. All new and related compounds were evaluated for their in vitro antimicrobial activity against different bacteria. The compounds 17, 18, 19, 20, 21, 22 and 24 were found very effective to inhibit the growth of Enterococcus faecalis (ATCC 29212) and Staphylococcus aureus (ATCC 29213) at minimum inhibitory concentrations (MICs) of 25, 25, 12.5, 50, 25, 50 and 50 mu g/ml, respectively. The compounds 4, 10a, 10c, 16, 25, 26 and 31 were significantly effective against Enterococcus faecalis (ATCC 29212) and Staphylococcus aureus (ATCC 29213) with MIC values of 100-200 mu g/ml. None of the compounds proved to be effective against Escherichia coli (ATCC 25922) and Pseudomonas aeruginosa (ATCC 27853) in the concentrations studied.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 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 novel vinyl monomers having the imidazoline and pyrimidine moiety(Springer Verlag, 1996) Seckin, T; Alici, R; Cetinkaya, E; Ozdemir, IAlkylation of the methylene bridged tetrahydropyrimidine derivatives by chloromethylstyrene produces the bridged bis(4-vinylbenzyl)-1,4,5,6,-tetrahydropyrimidinium salts in high yields. Similar procedures are used to prepare 2-imidazolinium derivatives. The quaternary salts which support functional side groups of potential biomedical interest are characterized by means of spectroscopic methods. These monomers are readily polymerized free radically in solution of dimethyl formamide at moderate temperatures. The soluble and insoluble polymers containing 2-imidazolinium and 1,4,5,6-tetrahydropyrimidinium salts were found to exhibit antibacterial activites against Escherichia coli.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.
