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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.
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    Öğe
    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.