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    1,3-Bis(4-tert-butylbenzyl)-4,5-dihydroimidazolium chloride monohydrate
    (Wiley-Blackwell, 2009) Arslan, Hakan; VanDerveer, Don; Yasar, Sedat; Oezdemir, Ismail; Cetinkaya, Bekir
    In the title compound, C(25)H(35)N(2)(+)center dot Cl(-)center dot H(2)O,the imidazolidine ring adopts a twisted conformation, with a pseudo-twofold axis passing through the N-C-N carbon and the opposite C-C bond. The N-C-N fragment of the imidazolidine ring shows some degree of both double- and single-bond character due to partial electron delocalization. One of the tert-butyl groups is disordered over two conformations with occupancies of 0.714 (8) and 0.286 (8). In the crystal, O-H center dot center dot center dot Cl and C-H center dot center dot center dot O hydrogen bonds help to establish the packing.
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    1-(2-Phenylbenzyl)-3-(2,4,6-trimethylbenzyl)imidazolidinium bromide
    (Wiley-Blackwell Publishing, Inc, 2009) Arslan, Hakan; VanDerveer, Don; Yasar, Sedat; Ozdemir, Smail; Cetinkaya, Bekir
    In the title salt, C(26)H(29)N(2)(+)center dot Br(-),which may serve as a precursor for N-heterocyclic carbenes, the imidazolidine ring adopts a twist conformation with a pseudo-twofold axis passing through the N-C-N carbon and the opposite C-C bond. The N-C-N bond angle [113.0 (4)degrees] and C-N bond lengths [1.313 (6) and 1.305 (6) angstrom] confirm the existence of strong resonance in this part of the molecule. In the crystal, a C-H center dot center dot center dot Br interaction is present. The dihedral angle between the biphenyl rings is 64.3 (2)degrees and the phenyl rings make angles of 76.6 (3) and 18.5 (3)degrees with the plane of the imidazolidine ring.
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    Dichloride [1-(2,4,6-trimethylbenzyl)-3-(biphenyl-2-ylmethyl)-imidazolidin-2-ylidine (eta(6)-hexamethylbenzene)]ruthenium
    (Scientific Technical Research Council Turkey-Tubitak, 2006) Arslan, Hakan; Van Derveer, Donald; Ozdemir, Ismail; Yasar, Sedat; Cetinkaya, Bekir
    The single crystal X-ray structure of the imidazolidin ruthenium complex, C38H46N2Cl2Ru, was determined. The complex is an orthorhombic space group Pbca with a = 17.3586(32) angstrom, b = 14.4447(27) angstrom, c = 27.4325(52) angstrom, and V = 6878.466(4) angstrom(3) with Z = 8 for D-calc = 1.357 g/cm(3). It exhibits the expected 3-legged piano stool geometry. There is one coordination bond of the ruthenium atom with the electrons of the eta(6)-hexamethylbenzene, 2 symmetrical Ru-Cl bonds, and one Ru-C bond involving the imidazole ring. The coordination around the ruthenium atom is 4-fold, which in this is case is pseudo-tetrahedral.
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    Dichlorido[1-(2-methylbenzyl)-3-(2,4,6-trimethylbenzyl)imidazolidin-2-ylidene]ruthenium(II)
    (Blackwell Publishing, 2007) Arslan, Hakan; VanDerveer, Don; Yasar, Sedat; Ozdemir, Ismail; Cetinkaya, Bekir
    In the title compound, [RuCl2(C21H26N2)], the Ru atom has a pseudo-octahedral geometry, with the arene occupying three adjacent sites of the octahedron. Two Cl atoms and one carbene group complete the octahedron.
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    Dichlorido[1-(2-methylbenzyl)-3-(eta(6)-2,4,6-trimethylbenzyl)-1H-2,3-dihydrobenzimidazol-2-ylidene]ruthenium(II) dichloromethane solvate
    (Wiley-Blackwell, 2009) Arslan, Hakan; VanDerveer, Don; Yasar, Sedat; Ozdemir, Ismail; Cetinkaya, Bekir
    The title complex, [RuCl2(C25H26N2)]center dot CH2Cl2, is best thought of as containing an octahedrally coordinated Ru center with the arene occupying three sites. Two Ru-Cl bonds and one Ru-carbene bond complete the distorted octahedron. The carbene portion of the ligand is a benzimidazole ring. This ring is connected to the C6H2(CH3)(3) arene group by a CH2 bridge. This leads to a system with very little apparent strain. A dichloromethane solvent molecule completes the crystal structure. Further stabilization is accomplished via C-center dot center dot center dot N and C-H center dot center dot center dot Cl interactions.
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    Dichlorido[1-(3,5-dimethylbenzyl)-3-(2,4,6-tri-methylbenzyl)imidazolidin-2-ylidene]ruthenium(II)
    (Blackwell Publishing, 2007) Arslan, Hakan; VanDerveer, Don; Yasar, Sedat; Ozdemir, Ismail; Cetinkaya, Bekir
    The title compound, [RuCl2(C22H28N2)], contains an octahedrally coordinated Ru centre with the arene ring occupying three sites and the other positions occupied by vinylidene C and two Cl atoms.
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    Heck and suzuki reactions of aryl halides catalyzed by 1,3-dialkylimidazolinium/palladium
    (Science Press, 2008) Yasar, Sedat; Oezdemir, Ismail; Cetinkaya, Bekir
    New, sterically demanding 1,3-dialkylimidazolinium salts used as N-heterocyclic carbene precursors were synthesized and characterized. These salts, combined with palladium acetate, provided active catalysts for Heck and suzuki cross-coupling of aryl chlorides and bromides under mild conditions.
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    Ru(II)-NHC catalysed N-Alkylation of amines with alcohols under solvent-free conditions
    (Elsevier Science Sa, 2021) Karaca, Emine Ozge; Dehimat, Zieneb Imene; Yasar, Sedat; Gurbuz, Nevin; Tebbani, Dahmane; Cetinkaya, Bekir; Ozdemir, Ismail
    The reaction of [RuCl2(p-cymene)]2 with in situ prepared Ag-N-heterocyclic carbene (NHC) complexes yields a series of [RuCl2(p-cymene)(NHC)] complexes (2). All of the complexes have been characterised by elemental analysis, and 1H NMR and 13C NMR spectroscopies. These complexes have been tested for the N-alkylation of aromatic amines with arylmethyl alcohols under neat conditions in the presence of KOtBu at 120 ?C. Compounds (2) are stable and have high catalytic/selective activity for the N-alkylation reactions of primary amines to afford secondary amines.
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    Transfer Hydrogenation of Ketones by Ruthenium Complexes Bearing Benzimidazol-2-ylidene Ligands
    (Wiley-Blackwell, 2010) Gurbuz, Nevin; Yasar, Sedat; Ozcan, Emine Oezge; Ozdemir, Ismail; Cetinkaya, Bekir
    A series of benzimidazolium ligand precursors were metalated with [RuCl(2)(p-cymene)](2) to give ruthenium(II) N-heterocyclic carbene complexes. All compounds were fully characterized by elemental analyses, (1)H NMR, (13)C NMR, and IR spectroscopy. The new benzimidazol-2-ylidene complexes have been found to be effective catalysis for the transfer hydrogenation of ketones by using 2-propanol as the hydrogen source in the presence of KOH.