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    Palladium N-heterocyclic-carbene-catalyzed ortho-arylation of benzaldehyde derivatives
    (Wiley-Blackwell, 2008) Dogan, Oznur; Gurbuz, Nevin; Ozdemir, Ismail; Cetinkaya, Bekir
    New, sterically demanding 1,3-dialkylbenzimidazolium salts (2a-c) as N-heterocyclic-carbene precursors have been synthesized and characterized. The ortho position of aromatic aldehydes was directly and selectively arylated with aryl chlorides in the presence of a catalytic system prepared in situ from Pd(OAc)(2), 1,3-dialkylbenzimidazolium chlorides (2a-c), and Cs(2)CO(3). (C) 2008 Wiley Periodicals, Inc.
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    Palladium(II)-NHC complexes containing benzimidazole ligand as a catalyst for C-N bond formation
    (Wiley, 2011) Dogan, Oznur; Demir, Serpil; Ozdemir, Ismail; Cetinkaya, Bekir
    The reaction of 2-(2-bromoethyl)-1,3-dioxane with 1-alkylbenzimidazole derivatives results in the formation of the new benzimidazoliumsalts (1). The reaction of Pd(OAc)(2) with1,3-dialkylbenzimidazoliumsalts(1a-c) yields palladium N-heterocyclic carbene (NHC) complexes (2a-c). All synthesized compounds were characterized by (HNMR)-H-1, (CNMR)-C-13, IR and elemental analysis techniques which support the proposed structures. As catalysts, these new palladium complexes offer a simple and efficient methodology for the synthesis of triarylamines and secondary amines from anilines and amines and in a single step with potassium tertiary butoxide as a base. Copyright (C) 2010 John Wiley & Sons, Ltd.
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    Synthesis, characterization and catalytic activity of novel N-heterocyclic carbene-palladium complexes
    (Royal Soc Chemistry, 2009) Dogan, Oznur; Gurbuz, Nevin; Ozdemir, Ismail; Cetinkaya, Bekir; Sahin, Onur; Buyukgungor, Orhan
    The reaction of Pd(OAc)(2) with 1-(benzhydryl)-3-(alkyl) benzimidazolium salts 1a-d yields trans-bis[1-(benzhydryl)-3-(alkyl)benzimidazolin-2-ylidene]dibromopalladium(II) complexes (2a-d) which were characterized by elemental analysis, NMR spectroscopy and the molecular structures of 2b, and 2d were determined by X-ray crystallography. The catalytic activity of PdBr(2)bis(benzimidazolin-2- ylidene) complexes 2a-d was evaluated in the direct arylation reaction of benzothiazole with bromobenzene derivatives.