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1999 (2)
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1Author    HamedA. Daboun, AhmedM. El-ReedyRequires cookie*
 Abstract    2-Mercapto-4-amino-5-cyano-6-arylpyrimidines (la, b), 2-hydroxy derivatives lc, d and 2-methylmercapto derivatives 4 a, b were synthesised via the reaction of either a mixture of malononitrile and aromatic aldehyde or arylidene malononitrile with thiourea, urea and S-methylisothiourea, respectively, lc, d could also be obtained by the action of hydrogen peroxide on la, b or by the action of hydrochloric acid on 4a, b. Compounds 4a, b could also be prepared by the action of methyl iodide on la, b. 4a reacted with hydrazine hydrate to give the 2-hydrazino derivative 5 which condensed easily with aromatic aldehydes to give the Schiff's bases 6 a, b. Compound 5 could be converted into the tetrazolo-and s-triazolopyrimidines 7 and 9 by the action of nitrous acid and carbon disulphide respectively. Structures of the newly synthesised compounds were established by chemical routes and spectral studies. 
  Reference    Z. Naturforsch. 38b, 1686—1689 (1983); received June 13 1983 
  Published    1983 
  Keywords    Malononitrile, Urea Derivatives, Pyrimidines, Tetrazolopyrimidine, s-Triazolopyrimidine 
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 TEI-XML for    default:Reihe_B/38/ZNB-1983-38b-1686.pdf 
 Identifier    ZNB-1983-38b-1686 
 Volume    38 
2Author    Flavio Bonati, Alfredo Burini, BiancaRosa PietroniRequires cookie*
 Title    Mono-and Binuclear Gold(I) Compounds Containing Deprotonated Purines and Pyrimidines  
 Abstract    In the presence of alkali and L A uC l one or two —N H — groups of a purine or pyrimidine base can be transformed into -N (A u L)-groups giving stable and soluble compounds containing one or two two-coordinated gold(I) nuclei; mononuclear L A u -Q ' or binuclear L A u -Q -A u L with a monodentate Q " or an exobidentate O ' " ligand, resp. (Q 'H = adenine, guanine, theobromine, theophylline, azaguanine or cytosine; Q H 2 -thymine or uracyl; L = triphenylphosphine). 
  Reference    Z. Naturforsch. 40b, 1749—1752 (1985); received June 18 1985 
  Published    1985 
  Keywords    Deprotonated Purines, Pyrimidines, Mono-and Binuclear Gold(I) Compounds 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-1749.pdf 
 Identifier    ZNB-1985-40b-1749 
 Volume    40 
3Author    T. Kromp, W. S. SheldrickRequires cookie*
 Title    One-and Two-Dimensional Copper(I) Halide Based Coordination Polymers with Bridging Pyridazine or Pyrimidine Ligands  
 Abstract    1-Dimensional coordination polymers J. [CuX(/i-pydz)] 1 -3 (X = Cl, Br, I; pydz = pyrid­ azine) may be prepared by self-assembly in acetonitrile solution at 120 °C (1) or room temper­ ature (2, 3). Individual chains contain (CuX)2 rings and dimeric [Cu(^-pydz)]2 substructures. At a 2:1 molar ratio treatment of Cul with pydz in acetonitrile affords the lamellar complex ^ [(Cul)2(/i-pydz)] (4) whose novel ^ [(Cul)2] sheets contain fused 4-, 6-and 8-membered (Cul)" rings and are stabilized by pydz bridging between adjacent Cu atoms. In contrast, l_ [(CuBr)2(/i-pym)2] (5) (pym = pyrimidine) contains separated J. [CuBr] chains and (CuBr)2 rings as participating building units. 
  Reference    Z. Naturforsch. 54b, 1175—1180 (1999); received June 9 1999 
  Published    1999 
  Keywords    Copper(I) Halides, Pyridazine, Pyrimidine, Coordination Polymers 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1175.pdf 
 Identifier    ZNB-1999-54b-1175 
 Volume    54 
4Author    B. Roßenbeck, W. S. SheldrickRequires cookie*
 Title    Three-dimensional Copper(I) Halide Based Coordination Networks with Asymmetrically Substituted Bridging N-Donor Ligands  
 Abstract    The discrete complex [(Cul)2 (pyzCN)4] (1) and the coordination polymers ^ [CuI(pyzCN)] (2) and 3 [(CuX)3 (pyzCN)2] (3, 4; X = Br, Cl) may be prepared from the respective copper(I) halide CuX and 2-cyanopyrazine (pyzCN) by self-assembly in acetonitrile solution at 100-120°C. Whereas 2 exhibits 1 [Cul] staircase double chains as its characteristic substructure, the three-dimensional netwo'rks of 3 and 4 contain single zigzag CuX strings. The influence of the copper(I) halide on both the connectivity pattern and the dimensionality of a resulting coordination network is particularly apparent for the 1:1 complexes ^ [CuI(pymMe)] (5), 3 [(CuBr)3(pymMe)_3] (6) and ^ [CuCl(pymMe)] (7), which were generated by reaction of öaX with 4-methylpyrimidine (pymMe) under reaction conditions similar to those above. 
  Reference    Z. Naturforsch. 54b, 1510—1516 (1999); received August 27 1999 
  Published    1999 
  Keywords    Copper (I) Halides, Coordination Polymers, Crystal Engineering, Pyrazine, Pyrimidine 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1510.pdf 
 Identifier    ZNB-1999-54b-1510 
 Volume    54 
5Author    Ryszard Stolarski, Mieczyslaw Remin, David ShugarRequires cookie*
 Title    Studies on Prototropic Tautomerism in Neutral and Monoanionic Forms of Pyrimidines by Nuclear Magnetic Resonance Spectroscopy  
  Reference    (Z. Naturforsch. 32c, 894 [1977]; received August 1/September 19 1977) 
  Published    1977 
  Keywords    Pyrimidines, Prototropic Tautomer Populations, Nuclear Magnetic Resonance, 1H and 13C Chemical Shifts, 1H, *H Coupling Constants 
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 TEI-XML for    default:Reihe_C/32/ZNC-1977-32c-0894.pdf 
 Identifier    ZNC-1977-32c-0894 
 Volume    32