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    In situ generated rhodium-based catalyst for addition of phenylboronic acid to aldehydes
    (Wiley-Hindawi, 2005) Yigit, M; Özdemir, I; Çetinkaya, E; Çetinkaya, B
    New 1,3-dialkylperhydrobenzimidazolinium and 1,3-dialkylimidazolinium salts (2,4) as NHC precursors have been synthesized and characterized. These salts in combination with [RhCl(COD)](2) provided active catalysts for the addition of phenylboronic acid to aldehydes under mild conditions. The in situ prepared three-component system [RhCl(COD)](2)/imidazolinium salts (2,4) and KOBu' catalyse the addition of phenylboronic acid to sterically hindered aldehydes affording the corresponding arylated secondary alcohols in good yields. (c) 2005 Wiley Periodicals, Inc.
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    Novel N-heterocyclic-carbene-rhodium complexes as hydrosilylation catalysts
    (Elsevier, 2005) Yigit, M; Özdemir, I; Çetinkaya, B; Çetinkaya, E
    Novel rhodium-1,3-dialkylperhydrobenzimidazolin-2-ylidene (2a,b) and 1,3-dialkylimidazolin-2-ylidene complexes (4a,b) have been prepared and characterized by C, H, N analysis, H-1 NMR and C-13 NMR. Triethylsilane reacts with acetophenone derivatives in the presence of catalytic amount of the new rhodium(I)-carbene complexes, RhCl(COD)(1,3-dialkylperhydrobenzimidazolin-2-ylidene) or RhCl(COD)(1,3-dialkylimidazolin-2-ylidene) to give the corresponding silylethers in good yields (63-99%). (c) 2005 Elsevier B.V. All rights reserved.
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    Synthesis and characterization of polyimides containing a chiral dimine link that mimics the salen ligand
    (Vsp Bv, 2004) Seçkin, T; Köytepe, S; Yigit, M; Çetinkaya, E
    We report the synthesis of a covalently linked complex that mimics the salen ligand within the main chain of the polyimide network. The thermally-stable solid polyimides offer suitable sites for metal coordination, which is a crucially important step in establishing steroselectivity. The ligand synthesized by the sequential treatment of a chiral trans-1,2-diaminocyclohexane and p-dimethylaminobenzaldehyde was used to prepare polyimides by a one-step polymerization in the dipolar media. A series of stable polyimides was synthesized from (IS,2S)- and (1R,2R)-bis(p-dimethylaminobenzylideneamino)-1,2-cyclohexyl and various aromatic dianhydrides had inherent viscosities ranging from 1.45 to 2.21 dl/g and were soluble in polar solvents. The glass transition temperatures were 264-319degreesC, and the 10% weight loss temperatures were above 406-487degreesC.
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    Synthesis of arylacetic acid derivatives from diethyl malonate using in situ formed palladium(1,3-dialkylimidazolidin-2-ylidene) catalysts
    (Pergamon-Elsevier Science Ltd, 2004) Özdemir, I; Yigit, M; Çetinkaya, E; Çetinkaya, B
    The in situ prepared three component system Pd(OAc)(2)/1,3-bis(alkyl) imidazolinium halide LHX (1-5)/Cs2CO3 catalyses the arylation of diethyl malonate efficiently with accompanying dealkoxycarbonylation. Imidazolinium salts with bulky benzyl and alkoxyethyl groups were found to be the most efficient and afforded alpha-arylacetates in high yields when employing a wide variety of substrates. (C) 2004 Elsevier Ltd. All rights reserved.
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    Synthesis of novel palladium N-heterocyclic-carbene complexes as catalysts for Heck and Suzuki cross-coupling reactions
    (Wiley, 2006) Özdemir, I; Yigit, M; Çetinkaya, E; Çetinkaya, B
    Novel palladium-1,3-dialkylperhydrobenzimidazolin-2-ylidene (2a-c) and palladium-1,3-dialkylimidazolin-2-ylidene complexes (4a,b) have been prepared and characterized by C, H, N analysis, H-1-NMR and C-13-NMR. Styrene or phenylboronic acid reacts with aryl halide derivatives in the presence of catalytic amounts of the new palladium-carbene complexes, PdCl2(1,3-dialkylperhydrobenzimidazolin-2-ylidene) or PdCl2(1,3-dialkylimidazolin-2-ylidene) to give the corresponding C-C coupling products in good yields. Copyright (c) 2006 John Wiley & Sons, Ltd.