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    Half-sandwich eta(6)-arene-ruthenium(II) complexes bearing 1-alkyl(benzyl)-imidazo[4,5-f][1,10]-phenanthroline (IP) derivatives: the effect of alkyl chain length of ligands to catalytic activity
    (Pergamon-Elsevier Science Ltd, 2013) Gok, Lutfiye; Turkmen, Hayati
    The reaction of bromoalkanes (R-Br; (3), R=CnH2n+1. n=4 (a), 8 (b), 12 (c),18 (d)) and bromobenzyl derivatives (R'-Br; (4), R'=CH2C6H2(CH3)(3)-2,4,6 (a); CH2C6H(CH3)(4)-2,3,5,6 (b); CH2C6(CH3)(5) (c)) with 1H-imidazo[4,5-f][1,10]-phenanthroline (IP)(L-2) gave the corresponding 1-R-imidazo[4,5-f][1,10]-phenanthroline (IPR)(L3a-d) and 1-R'-imidazo[4,5-f][1,10]-phenanthroline(IPR')(L4a-c) ligands, respectively. Treatment of L3a-d and L4a-d with [Ru(p-cymene)Cl-2](2) led to the formation of [Ru(p-cymene)(IPR)Cl]Cl (RuL3a-d) and [Ru(p-cymene)(IPR')Cl]Cl (RuL4a-c). New ruthenium(II) complexes RuL3a-d and RuL4a-c were characterized by elemental analysis, FTIR, UV-visible and NMR spectroscopy. In order to understand effects of these changes on the N-substituent of imidazol on IP and how they translate to catalytic activity, these new RuL2, RuL3a-d and RuL4a-c were applied in the transfer hydrogenation of ketones by 2-propanol in presence of potassium hydroxide. The activities of the catalysts were monitored by NMR and GC analysis. (C) 2013 Elsevier Ltd. All rights reserved.
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    The imidazo{[4,5-f][1,10]-phenanthrolin}l-2-ylidene and its palladium complexes: Synthesis, characterization, and application in C-C cross-coupling reactions
    (Elsevier Science Sa, 2017) Gok, Lutfiye; Gunnaz, Salih; Sahin, Zarife Sibel; Pelit, Levent; Turkmen, Hayati
    1,3-dibutyl-1H-imidazo[4,5-f][1,10]phenanthrolinium iodide, L-5 center dot 2HI ligand and their mono-, di-, tri-, tetra-nuclear palladium(II) complexes (5 center dot HPF6, 6-8) were synthesized and characterized by elemental analysis, FTIR, UV-visible and NMR spectroscopy. In addition, the complexes (5 center dot HPF6, 6-8) were determined by mass spectrometry (MALDI). The ligand L-5 center dot 2HI was determined by X-ray diffraction. The complexes (5 center dot HPF6, 6-8) were tested in Suzuki-Miyaura and Mizoroki-Heck reactions at elevated temperatures. The activities of the catalysts were monitored by NMR and GC analysis. We found that the poly-nuclear complexes display better activities compared to the mono-nuclear derivatives, thus proposing that an increase in metal moieties which leads to an increase in activity in cross-coupling reaction. (C) 2016 Elsevier B.V. All rights reserved.
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    (NHC)-Pd(II) complexes with hydrophilic Nitrogen ligands; catalytic properties in neat water
    (Scientific Technical Research Council Turkey-Tubitak, 2013) Turkmen, Hayati; Gok, Lutfiye; Kani, Ibrahim; Cetinkaya, Bekir
    The cleavage reactions of the dimers [(NHC)PdX2](2) with hydrophilic N-donors, L, a ff orded the mixedligand complexes of the type trans-[(NHC)LPdX2] (X = Cl or Br; NHC = 1,3-dialkylbenzimidazol-2-ylidene (BIm) or bis(imino) acenaphthene-annulated bis(2,6-diisopropylphenyl) imidazol-2-ylidene (BIAN-IPr); L = diethanolamine (DEA), morpholine (MOR), and 3-pyridinecarboxylic acid (3-PCA)). The new complexes (1-3) were characterized by elemental analysis and spectroscopic methods and the molecular structure of 1a was determined by X-ray di ff raction studies. These complexes were applied in the Suzuki-Miyaura cross-coupling reaction of phenylboronic acid with aryl halides in neat water. The activities of catalysts were monitored by gas chromatography-flame ionization detector and nuclear magnetic resonance. Whereas the complexes with DEA or 3-PCA ligands did not show signi fi cant di ff erence in the activity, the BIAN-IPr complexes 1b and 3b bearing DEA and 3-PCA, displayed the highest catalytic activity at 100 degrees C.
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    Piano-stool benzothiazol-2-ylidene Ru(II) complexes for effective transfer hydrogenation of carbonyls
    (Elsevier Science Sa, 2016) Oruc, Zeynep Ipek; Gok, Lutfiye; Turkmen, Hayati; Sahin, Onur; Buyukgungor, Orhan; Cetinkaya, Bekir
    Benzothiazolium bromides (NSHC center dot HBr) (1a-j) with a variety of alkyl chain or benzyl substituents on N atom were prepared. The synthesis of ruthenium(II) (NSHC) complexes, (2a-j) could be achieved by in situ deprotonation of benzothiazolium salts with Ag2O and [RuCl2(p-cymene)](2). They were characterized by H-1, C-13, F-19 NMR, IR spectroscopy and elemental analysis. The molecular structures of 2d, 2e and 2g were ascertained by single-crystal X-ray diffraction studies. The catalytic properties of complexes, (2aej), with electron-donating or -withdrawing groups were investigated in transfer hydrogenation (TH) of ketones, and aldehydes with good to excellent yields. The presence of the CH2(CH2)(16)CH3 or CH2C6F5 on the N atom of the benzothiazol-2-ylidene complexes (2g, 2j) showed the highest activity for TH reaction. The catalytic properties of the N-alkyl substituted ruthenium(II) (NSHC) complexes(2h-j) may be interpreted by micelle effects. (C) 2016 Elsevier B.V. All rights reserved.