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1Author    Wolf-H GündelRequires cookie*
 Title    Untersuchungen an quartären Pyridinium-Salzen, XTV [1] Dihydropyridyl-oxiinether Investigations of Quaternary Pyridinium Salts, XIV [1] Dihydropyridyl-oxime-ethers  
 Abstract    Pyridinium Salts with electron-withdrawing groups in the 3-position react with aliphatic ketoximes under basic conditions to lipophilic addition products, 6-(alkylideniminoxy)-1,6-dihydropyridines. 
  Reference    Z. Naturforsch. 36b, 1031—1036 (1981); eingegangen am 21. April 1981 
  Published    1981 
  Keywords    Pyridinium Salts, Insertion Reaction, Oximes 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1031.pdf 
 Identifier    ZNB-1981-36b-1031 
 Volume    36 
2Author    KonstantinV. Domasevitch3, VeraV. Ponomarevaa, AndreyA. Mokhir3, EduardB. Rusanov3, Joachim Sielerb, Eberhard HoyerbRequires cookie*
 Title    The Phenomenon of Intramolecular Attractive S— O Interactions: Synthesis and Structure of (l,10-Phenanthroline)copper(II) Complexes with Isonitroso-(4-methylthiazol-2-yl)acetamide and Isonitroso-(4-methylthiazol-2-yl)-(benzothiazoI-2-yl)methanide  
 Abstract    Isonitroso-(4-methylthiazol-2-yl)acetamide H (L '), isonitroso-(4-methylthiazol-2-yl)(benzo-thiazol-2-yl)methanide H(L2) and their copper(II) complexes of composition [C u(Phen){L'}(C 104)] (1) and [Cu(Phen){L2}Cl]*C2H5 0 H (2) have been prepared. Crys­ tal and molecular structures of the complexes have been determined from X-ray diffractioon data (1: monoclinic, space group P2]/c, with a = 11.611(2), b = 10.259(2), c = 17.869(4) Ä, ß = 104.67(3)°, V = 2059.1(7) Ä3, Z = 4; R\ = 0.046 for the 2522 unique reflections with I > 2a(I). 2: triclinic, space group PI, with a = 8.351(1), b = 10.876(1), c = 14.891(2) Ä, a = 96.170(8)°, ß = 94.201(9)°, 7 = 106.721(9)°, V = 1280.1(2) A3, Z = 2; R\ = 0.034 for the 4038 unique reflections with I > 2a(I)). In the structure of 1 the coordination polyhedron of Cu2+ is a distorted square pyramid with an oxygen atom of the CIO4 counter anion in the apex (C u -0 2.505(3) A); in complex 2 the copper atom adopts fivefold coordination of a slightly distorted trigonal-bipyramidal geometry with a chlorine atom in the equatorial plane (Cu-Cl 2.3504(9) A). Ethanol of crystallization gives rise to a hydrogen bond at the chlorine atom. In both structures the oximic anions are coordinated to the metal center in a bidentate chelate manner via the nitrogen atom of the nitroso group and the carbonyl oxygen atom (1) or via the benzothiazole nitrogen atom (2) (Cu-O, Cu-N in the range 1.963(2) -2.031 (2) Ä). The thiazole group of the ligands takes no part in the coordination. The nitroso oxygen atoms possess short intramolecular contacts with thiazole sulphur atoms, with d(S— O) at 2.605(3) (1) and 2.676(3) A (2), which may be attributed to a strong intraligand interaction. 
  Reference    Z. Naturforsch. 52b, 323—330 (1997); received September 16 1996 
  Published    1997 
  Keywords    Copper(II), Oximes, Thiazoles, Benzothiazoles, X-Ray 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0323.pdf 
 Identifier    ZNB-1997-52b-0323 
 Volume    52 
3Author    Teresa Borowiak3, Irena Wolska3, Herbert Mayrb, Janusz BarancRequires cookie*
 Title    X-Ray Structure4]non-2-ene  
 Abstract    of 6(is)-[2(Z)-(Hydroxyimino)-2-phenylethyIidene]-7,7,8,8,9,9-hexamethyl-3-phenyl-l,2-oxazaspiro[4. The X-ray crystallographic structure of the title compound, a product of a 1,3-dipolar cy­ cloaddition reaction of benzonitrile oxide to 3,3,4,4,5,5-hexamethyl-l,2-bis(methylene)cyclo-pentane, has been determined. Colourless plates crystallize in the orthorhombic space group Pbca with cell dimensions a = 13.698(2), b = 11.836(2), c = 29.157(4) A, V= 4727.2(1.2)A3, Z = 8, 3736 reflections, final R(F) = 0.063 and wR(F2) = 0.166. The crystals are racemic, the molecules of opposite chirality form centrosymmetric dimers via intermolecular hydro­ gen bonds O-H -N between their oxime groups. The molecules are highly strained and the geometrical consequences of the steric strain are discussed. 
  Reference    Z. Naturforsch. 56b, 354—358 (2001); received November 27 2000 
  Published    2001 
  Keywords    1, 3-Dipolar Cycloaddition Product, Oxime, Isoxazoline 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0354.pdf 
 Identifier    ZNB-2001-56b-0354 
 Volume    56 
4Author    E. K. Yudin, K. V. Domasevitch, E. B. RusanovRequires cookie*
 Title    Crystal and Molecular Structure of Isonitrosomalonodiamido- (2,2-dipyridyl)copper(II), Chloride Monohydrate [Cu(Dipy){ONC(CONH2)2}Cl] H20  
 Abstract    The crystal and molecular structure of the complex [Cu(Dipy){NDA}Cl] • H 20 , where (NDA) = {ONC(CONH2)2}~ anion (space group P I, triclinic, with a = 7.834(1), b = 9.923(1), c = 9.952(1)A, a = 93.60(1), ß = 93.65(1), y = 92.72(1)°, Z = 2) has been determined from X-ray diffraction data. The structure was refined to R -0.029 for 2243 reflections with I>3ct(I). The coordination polyhedron of Cu2+ can be described as a distorted square pyra­ mid with a chlorine atom in the apex, and with the central atom situated 0.258(3) A above the base of the pyramid towards the chlorine atom. The complicated system of hydrogen bonding involving the water of crystallization connects copper complex units in to the chains in the c direction. 
  Reference    Z. Naturforsch. 50b, 864—866 (1995); received O ctober 17 1994 
  Published    1995 
  Keywords    Copper(II), Oximes, 2, 2-Dipyridyl, X-Ray Spectra 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0864.pdf 
 Identifier    ZNB-1995-50b-0864 
 Volume    50 
5Author    H. Möhrle, M. JeandréeRequires cookie*
 Title    Chinazolinderivate durch Cyclodehydrierung von N-(2-substituierten Aryl)-Piperidinen Quinazoline Derivatives by Cyclodehydrogenation of N-(2-Substituted Aryl)-Piperidines  
 Abstract    D ehydrogenation of the N-[2-(aminocarbonyl)phenyl]piperidines 1 -5 using H g(II)-EDTA, generated the quinazolinones 6 -9 . Increasing size of the 4-substituent in the piperidine de­ creased the oxidation rate and the product yield. N-[2-(Hydroxyiminomethyl)phenyl]piperidines 18-22 showed a different behaviour. While 18 with H g(II)-ED TA in water produced the oxime lactam 24 in quantitative yield, the 4-substituted piperidines 19-21 caused not only a lower reaction rate but also an altered pro­ duct pattern. The double dehydrogenation to lactams was reduced and the cyclic nitrones, formed by two electron withdrawal, became dominant. From the spiro compounds 21 and 22, solely the quinazoline-N-oxides 29 and 30 resulted. The mechanism of the reactions is discussed. 
  Reference    Z. Naturforsch. 54b, 1577—1588 (1999); eingegangen am 31. August 1999 
  Published    1999 
  Keywords    Amide, Oxime, Nitrone, Neighboring Group Participation, M ercury(II)-EDTA D ehydrogenation 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1577.pdf 
 Identifier    ZNB-1999-54b-1577 
 Volume    54