Yazar "Ulku, D" seçeneğine göre listele
Listeleniyor 1 - 4 / 4
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe (1E,3Z,5E)-2,5-diaza-1,6-bis(dimethylamino)-1,3,5-hexatriene-3,4-dicarbonitrile(Int Union Crystallography, 1996) Kucukbay, H; Cetinkaya, E; Ulku, D; Tahir, MNThe title structure consists of discrete C10H14N6 molecules which have a cis configuration and an extended conjugation. The molecules are slightly distorted from planarity.Öğe cis-1,1'-Dimethyl-3,3'-diphenyl-2,2'-biimidazolidinylidene(Munksgaard Int Publ Ltd, 1997) Ulku, D; Tahir, MN; Cetinkaya, B; Ozdemir, IThe structure of the air-sensitive title compound consists of C20H24N4 molecules connected through a hydrogen bond. Neither the molecule as a whole nor the individual five-membered rings have a planar geometry. The dihedral angle between the best planes of the two phenyl rings is 50.87 (14)degrees. Weak intermolecular hydrogen bonding is observed between a C atom and an imidazolidine N atom.Öğe Synthesis of cis- and trans-dichloro(dimethylphenylphosphine) x-(1-methyl-1,4,5,6-tetrahydropyrimidine)platinum(II) and their spectral and structural characterization(Elsevier Science Sa, 1998) Cetinkaya, B; Ozdemir, I; Tahir, MN; Ulku, DInteraction of [{Pt(mu-Cl)Cl(PMe2Ph)}(2)] with 1-methyl-1,4,5,6-tetrahydropyrimidine, L (R = Me), in boiling toluene produced a mixture of cis- and trans- isomers of [PtCl2(PMe2Ph){N = CH(Me)CH2CH2CH2}] trans-complex 2 isomerizes to give thermody-namically more stable corresponding cis-complex 1 in boiling ethanol. Spectroscopic and X-ray diffraction data permit generalizations about cis- and trans- isomeric pairs to be made. In addition, the trans influence of the ligand L is reliably assessed. (C) 1998 Elsevier Science S.A. All rights reserved.Öğe Synthesis of tetraaminoalkenes containing the reduced pyrimidine skeleton and the x-ray molecular structure of 1,1'-ethylene-3,3'-dibenzylbi(hexahydropyrimidin-2-ylidene)(Royal Soc Chemistry, 1996) Alici, B; Cetinkaya, E; Cetinkaya, B; Ulku, D; Tahir, MNDeprotonation of a 1,1'-bridged bis(1,3-diaikyl-1,4,5,6-tetrahydropyrimidinium) diiodide with NaH gives in high yield a tetraaminoalkene 4, whereas the corresponding non-bridged tetrahydropyrimidinium iodide reacts with NaH only in the presence of KOBu; the title bridged tetraaminoalkene 4f was structurally characterized by single-crystal X-ray diffraction.
