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1Author    Uwe Klingebiel, Dieter BentmannRequires cookie*
 Title    Benzo(c)-l / 4 .2-thiazol, ein neues bicyclisches 1 Orr-System Benzo(c)-l A 4 ,2-thiazol. a New Bicyclic 10 ^-System  
 Abstract    In the reaction of lithiated N-(fluorodimethyl-silyl)-2,4,6-trimethylaniline with bis(trimethyl-silyl)-sulfurdiimide LiF is eliminated and a benzo(c)-l A 4 ,2-thiazol is formed. Trifluoroacetic acid reacts with this thiazol to give the trifluoro-acetate. 
  Reference    (Z. Naturforsch. 34b, 123—124 [1979]; eingegangen am 28. September 1978) 
  Published    1979 
  Keywords    Lithio-aminofluorosilane, Sulfurdiimide, Heterocycle, Trifluoroacetate 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0123_n.pdf 
 Identifier    ZNB-1979-34b-0123_n 
 Volume    34 
2Author    Adonis Georgiades, H. P. LatschaRequires cookie*
 Title    Reaktion von Triphenylbismutan mit aliphatischen Dicarbonsäuren Reactions of Triphenylbismuthan with Aliphatic Dicarbonic Acids  
 Abstract    By the reaction of Bi(C6Hs)3 with oxalic, malonic, succinic and maleic acids, five-, six-and seven-membered heterocycles with Bi-and O-atoms are formed. During the reaction two phenyl groups are cleaved off. 
  Reference    Z. Naturforsch. 35b, 1000—1001 (1980); eingegangen am 18. Dezember 1979/8. April 1980 
  Published    1980 
  Keywords    Heterocycles, Triphenylbismuthan, Aliphatic Dicarbonic Acids 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-1000.pdf 
 Identifier    ZNB-1980-35b-1000 
 Volume    35 
3Author    Martin DrägerRequires cookie*
 Title    5-Chlor-5-phenyl-l-oxa-4.6-dithia-5-stannocan, ein diplanarer Übergangszustand bei der Racemisierung der Wanne-Sessel- Konformation in einem 8-Ring [1] 5-Chloro-5-phenyl-l-oxa-4,6-dithia-5-stannocane, a Diplanar Transition State for the Racemisation of the Boat-Chair Conformation in an Eight-Membered Ring [1]  
 Abstract    The title compound has been synthesized from PhSnCl3 and the disodium salt of bis(2-mercaptoethyl)ether. The crystal structure has been determined and refined to R — 0.033. The conformation of the eight-membered heterocycle is slightly disordered and represents a diplanar form, which is generally considered the transition state near the saddle point of the energy surface between the two enantiomers of the boat-chair con-formation. The configuration around tin is a trigonal bipyramid with equatorial sulfur atoms, an equatorial phenyl group and with axial atoms CI and O (transannular distance Sn--0 241 pm). 
  Reference    Z. Naturforsch. 36b, 437—440 (1981); eingegangen am 4. Februar 1980 
  Published    1981 
  Keywords    Tin, Heterocycles, Conformation, Transition State 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0437.pdf 
 Identifier    ZNB-1981-36b-0437 
 Volume    36 
4Author    R. M. Mohareb, S. M. FahmyRequires cookie*
 Title    Activated Nitriles in Heterocyclic Synthesis: A Novel Synthesis of Pyridazine, Pyrimidine, Pyridine and Pyrano[4,3-b]pyridine Derivatives  
 Abstract    Diethyl-3-amino-2-cyano-2-pentendioate (1) reacts with aromatic amines and aminohetero-cyclic compounds to yield amide derivatives (2 c—h). The latter derivatives were utilised in syn-thesis of pyridazines (4a, b), pyrimidine (6), pyridone (9) and pyrano[4,3-b]pyridine (16a, b) derivatives via reaction with aryldiazonium chloride, trichloroacetonitrile, sodiummethoxide and cinnamonitrile derivatives, respectively. 
  Reference    Z. Naturforsch. 40b, 664—668 (1985); received December 5 1984 
  Published    1985 
  Keywords    Activated Nitriles, Heterocycles, Pyridazine Derivatives 
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 TEI-XML for    default:Reihe_B/40/ZNB-1985-40b-0664.pdf 
 Identifier    ZNB-1985-40b-0664 
 Volume    40 
5Author    HerbertW. Roesky, Karsten Swarat, Frank EdelmannRequires cookie*
 Title    Darstellung eines cyclischen Ferrocenderivates mit Wolfram (VI) Preparation of a Cyclic Ferrocene Derivative of Tungsten(VI)  
 Abstract    Ph2PC 5 H4FeC 5 H4PPh2 (1) reacts with Me3SiN3 with evolution of nitrogen to yield (Me3SiN = PPh2C 5 H4)2Fe (2). Treatment of 2 with WF6 results in the formation of (C 5 H4PPh2N)2FeWF4 (3). 3 is a rare example of a metal complex containing two metal atoms in very different oxidation states. 
  Reference    Z. Naturforsch. 43b, 231—232 (1988); eingegangen am 13. Oktober 1987 
  Published    1988 
  Keywords    Phosphorus, Heterocycles, Mass Spectra 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-0231.pdf 
 Identifier    ZNB-1988-43b-0231 
 Volume    43 
6Author    Amal Haoudi-M, Ahmed Azzah, Hans-Georg Mazzah, M. Schmidt, H. Athias Noltemeyer, W. Erbert, RoeskyRequires cookie*
 Title    Synthese und Struktur von achtgliedrigen Titan-und Zirkon-haltigen Siloxanringen Synthesis and Structure of Eight-Membered Titanium and Zirconium Containing Siloxane Rings  
 Abstract    Reaction o f (fBu)2Si(OH)2 with TiCl4, TiBr4, T il4, and ZrCl4 affords eight-membered rings 
  Reference    Z. Naturforsch. 46b, 587—5 (1991); eingegangen am 23. Juli 1990 
  Published    1991 
  Keywords    Titanium, Zirconium, Siloxane, Heterocycles 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0587.pdf 
 Identifier    ZNB-1991-46b-0587 
 Volume    46 
7Author    2. 2., Z. NaturforschRequires cookie*
 Abstract    -/erf-butyI-3,3'-bis(tri-m e th y lsily l)-l,l'-diazacobaltocen [1 ] 2.2..5.5'-Tetra-terr-butyl-3,3,-bis(tri-m eth y lsily l)-l,r-d iazaco b alto cen e [1] N o rb ert K uhn3 *, Stefan S tubenrauchb, D ieter B läserc, R oland B oesec The 1,1'diazacobaltocene pyr2Co (3) is obtai­ ned from the reaction of 2,5-di-terr-butyl-3-trime-thylsilylpyrrole (pyrH, 2) and CoCl2. The X-ray structure is reported. 
  Reference    Z. Naturforsch. 54b, 424—426 (1999); eingegangen am 5. November 1998 
  Published    1999 
  Keywords    Heterocycles, Pyrroles, Cobalt X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0424_n.pdf 
 Identifier    ZNB-1999-54b-0424_n 
 Volume    54 
8Author    Alexander Lichtblau, Hans-Dieter Hausen, Wolfgang KaimRequires cookie*
 Title    First Structural Characterization of an Easily Oxidized Derivative o f 1,4-Dihydroquinoxaline  
 Abstract    The first crystal structure analysis o f a 1,4-dihydroquinoxaline is described by example o f the l,4-bis(re/-/-butyldimethylsilyl) derivative. In the solid state, this molecule exhibits a non-planar heterocycle with a dihedral angle o f 156.3° along the N -N axis in the boat-shaped 87r electron ring system. The alkyl groups o f the Si(/er/-Bu)M e2 substituents are arranged as to minimize steric repulsion. Despite the reduced n electron conjugation due to non-planarity, the com pound is oxidized reversibly to an EPR detectable radical cation at -0 .5 9 V vs. ferro­ cene in dichloromethane. However, the second oxidation to the fully aromatic dication is elec-trochemically irreversible. A comparison with previously obtained results illustrates the struc­ tural flexibility o f the non-aromatic 1,4-dihydro-1,4-diazine ring system which is strongly affected by rather weak non-bonded interactions. 
  Reference    Z. Naturforsch. 48b, 713 (1993); eingegangen am 21. Dezember 1992 
  Published    1993 
  Keywords    Heterocycles, Organosilicon Compounds, Crystal Structure, Cyclic Voltammetry, Conformation 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-0713.pdf 
 Identifier    ZNB-1993-48b-0713 
 Volume    48 
9Author    Eva Estradaa, AntonR. IekerbRequires cookie*
 Title    Electrosynthesis of 2-Alkyl-4(3H)-quinazolinones  
 Abstract    Electroreduction of 2-nitrobenzonitrile in a variety of alcohols leads to 2-alkyl-4(3 H)-quinazolinones via incorporation of the alkyl chain of the alcohols under cyclization. Physical properties and spectroscopic data of the quinazolinones and a probable pathway of their formation are given. 
  Reference    Z. Naturforsch. 49b, 1566—1568 (1994); received July 7 1994 
  Published    1994 
  Keywords    Cathodic Reduction, 2-Nitrobenzonitrile Ring Closure, Alcohols, Heterocycles 
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 TEI-XML for    default:Reihe_B/49/ZNB-1994-49b-1566.pdf 
 Identifier    ZNB-1994-49b-1566 
 Volume    49 
10Author    Wolfgang Kaim, Jörg FeesRequires cookie*
 Title    The New Tetrafunctional i t Acceptor Ligand 3,6-Bis(2'-pyrimidyl)-l,2,4,5-tetrazine (bmtz): Diruthenium Complexes of bmtz and of its 1,4-Dihydro Form  
 Abstract    Synthesis, physical properties and the coordination with two [Ru(bpy)2]2+ complex frag­ ments are described for 3,6-bis(2'-pyrimidyl)-l,2,4,5-tetrazine (bmtz), the first compact ligand which offers four equivalent a-diimine chelate sites. Spectroelectrochemistry of intensely blue {(a-bmtz)[Ru(bpy)2]2}"+, n = 4, reveals a very facile reduction (n -3) at -0 .4 0 V vs. FeCp2+/o and a metal oxidation (n = 5) at +1.18 V to a diruthenium (II/III) mixed-valent form which exhibits an intervalence transfer absorption at 1490 nm. The corresponding complex {(M-H2bm tz)[Ru(bpy)2]2}4+ with the 1,4-dihydro form H 2bmtz of the tetrafunctional ligand is oxidized in two steps at 0.58 and 1.07 V vs. FeCp2+/°. 
  Reference    (Z. Naturforsch. 50b, 123—127 [1995]; received August 26 1994) 
  Published    1995 
  Keywords    Heterocycles, Complex Ligands, Ruthenium Compounds, Electrochemistry, Mixed Valency 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0123.pdf 
 Identifier    ZNB-1995-50b-0123 
 Volume    50 
11Author    Z. Einab, A. H. Ozien, *. A., -W Areth, A. O. Sarhan, H. Assan, A. H. El-Sherief, A. Bdalla, M. M. Ahm OudRequires cookie*
 Title    A Convenient One-Pot Synthesis of Pyrazolo[3,4-d]pyrimidines and s-Triazolo[3,4-b][l,3?5]thiadiazines  
 Abstract    The reaction of 5-am ino-3-aryl-l-phenylpyrazoles (la-d) with formaldehyde and secondary amines in boiling ethanol gave the corresponding 4-alkylaminomethyl derivatives (2a-f) and bis-(4-pyrazolyl)methane (4a,b) as byproduct. Such reaction with primary aliphatic and aro­ matic amines at room temperature afforded 1,3,5-trisubstituted (5a-h) and 1,3.5,7-tetrasubsti-tuted tetrahydropyrazolo[3,4-d]pyrimidines (8a-k) respectively in good yield. Similarily, the Mannich reaction of 5-m ercapto-3-phenyl-l,2,4-triazole (9) with secondary amines, in boiling ethanol, and primary aromatic amines, at room temperature, gave 2 -substituted aminomethyl derivatives (lOa-c) and (14a-g) respectively,while with primary aliphatic amines, p-toluidine and p-anisidine,at room temperature,and with other primary aromatic amines, in boiling etha­ nol, afforded the cyclized products l,2,4-triazolo[3,4-b]thiadiazines (13a-e); (15f,g) and (15a-e), respectively. 
  Reference    Z. Naturforsch. 52b, 1401—1412 (1997); received June 19 1997 
  Published    1997 
  Keywords    Pyrazoles, Heterocycles, Triazoles, 'H NM R Spectra 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-1401.pdf 
 Identifier    ZNB-1997-52b-1401 
 Volume    52 
12Author    Max Herberhold, Silke Gerstmann, Bernd WrackmeyerRequires cookie*
 Title    Tetrakis(sulfurdiimido)silane, -germane and -stannane  
 Abstract    Two tetrakis(sulfurdiimido)silanes [Si(NSNR)4 (R = rBu la, SiMe3 lb)], two germanes [Ge(NSNR)4 (R = rBu 2a, SiMe3 2b)] and one stannane [Sn(NSN?Bu)4Sn 3a] were prepared and characterised by 'H, l3C, i5N, 29Si and ll9Sn NMR spectroscopy in solution, and 3a was also studied in the solid state by 1 l9Sn CP/MAS NMR. Whereas la,b and 2a,b are monomeric in solution, the 119Sn NMR data suggest that 3a is associated both in solution and in the solid state, and that the tin atoms are hexa-coordinated. The attempted stepwise synthesis of la by using one, two, three or four equivalents of K[(NSN)rBu] led to mixtures of la with Cl3Si(NSNrBu) 4a, Cl2Si(NSN/Bu)2 5a, and ClSi(NSNfBu)3 6a. Only one sulfurdiimido ligand of the silane la reacted with hexachlorodisilane by oxidative addition and cleavage of the Si-Si bond to give the new heterobicyclic derivative 7a which is held together by two different coordinative N-Si bonds. 
  Reference    Z. Naturforsch. 53b, 573—580 (1998); received March 30 1998 
  Published    1998 
  Keywords    Silicon, Germanium, Tin, Sulfur Diimides, Heterocycles, NMR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0573.pdf 
 Identifier    ZNB-1998-53b-0573 
 Volume    53 
13Author    R.R G Upta, M. Kum, Rakesh KumarRequires cookie*
 Title    Studies on Diamagnetic Susceptibility of Biologically Active Heterocycles, Part 2 Diamagnetic Susceptibilities of 4H-l,4-Benzothiazines and their Sulfones  
  Reference    (Z. Naturforsch. 41b, 110 [1986]; received July 11 1985) 
  Published    1986 
  Keywords    4H -l, 4-B enzothiazines, Sulfones, Heterocycles, Diamagnetic Susceptibility 
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 TEI-XML for    default:Reihe_B/41/ZNB-1986-41b-0110.pdf 
 Identifier    ZNB-1986-41b-0110 
 Volume    41 
14Author    Structure, M. Spectroscopy, H.-D Agnetism, WolfgangK. Hausena, Aim, Andreas Schulz3, MichaelM. Oscherosch3, Jeanne Jordanovb, C.E A, -CE N GrenobleRequires cookie*
 Title    Erstmaliger Nachweis von ;r-;r-Dimerenbildung bei stabilen 1,4-Dialkylchinoxalinium-Radikalkationen. Struktur, Spektroskopie und Magnetismus First Evidence for 7t-7r-Dimerization of the Stable 1,4-Dialkylquinoxalinium Radical Cations  
 Abstract    Crystal and molecular structure analysis o f 1,4-diethylquinoxalinium iodide shows a virtual­ ly planar quinoxaline ring with 11 conjugated 7r-electrons. In contrast to the triiodide o f the I,4,6,7-tetramethyl derivative or to the tetraphenylborate salt o f 1,4-diethylquinoxalinium cat­ ion radical the iodide exhibits 7r-7r-dimerized radical cations in the solid state with synplanar ethyl groups and a rather small intermolecular distance o f about 315 pm between the 7r-planes o f the primarily interacting 1,4-diazine rings. Solid state magnetic measurements between 2 and 300 K show considerably diminished magnetic m om ents due to partial spin-pairing, and UV/VIS spectroscopic measurements in acetonitrile reflect the 7r-7r-interaction in solution through the appearance o f a long-wavelength absorption band. 
  Reference    Z. Naturforsch. 48b, 1181—1186 (1993); eingegangen am 1. Juni 1993 
  Published    1993 
  Keywords    Heterocycles, Radical Cations, Structure, M agnetism, A ssociation Phenomena 
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 TEI-XML for    default:Reihe_B/48/ZNB-1993-48b-1181.pdf 
 Identifier    ZNB-1993-48b-1181 
 Volume    48 
15Author    Requires cookie*
  Reference    (Z. Naturforsch. 31b, 1436—1437 [1976]; eingegangen am 18. Juni 1976) 
  Published    1976 
  Keywords    Tetramethyl-l, 2-dioxa-4, 5-diazine, Photooxidation, Heterocycles, Luminol-Chemiluminescence 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-1436_n.pdf 
 Identifier    ZNB-1976-31b-1436_n 
 Volume    31 
16Author    Klaus Beelitz», Klaus Praefcke, -A, Salo GronowitzRequires cookie*
 Title    Pyrido [2,3-d] thieno [3,2-b] [6H]thiopyran - ein neues heterocyclisches Ringsystem [1] Pyrido [2,3-d]thieno[3,2-b] [6 H]thiopyran - a New Heterocyclic Ring System [1]  
 Abstract    UV irradiation of S-(3'-thienyl)2-chloro-thionicotinate (1) in benzene solution leads via dehydrohalogenation and cj clization in competition to a-cleavage to formation of thio-lactone 2 besides aldehyde 3 and disulphide 4. 2 contains a new heterocyclic ring system which has been confirmed by spectroscopic methods. Einführung 
  Reference    Z. Naturforsch. 34b, 1573—1575 (1979); eingegangen am 4. Juli 1979 
  Published    1979 
  Keywords    Organic Sulfur Compounds, Heterocycles, Thiolester, a-Cleavage, Dehydrohalogenation, Photocyclization, Aromatic Photosubstitution 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-1573.pdf 
 Identifier    ZNB-1979-34b-1573 
 Volume    34 
17Author    Claudia Bäk, Klaus PraefckeRequires cookie*
 Title    und dessen Cycloreversion Organic Sulfur Compounds, XLVII [1] Dimerization of Monothiobenzil to a 1,3-Dithietane and its Cycloreversion  
 Abstract    The thermal dimerization of monothiobenzil (lc) to a 1,3-dithietane (2c) and the photochemical cycloreversion of this heterocycle to 1 c is described. 
  Reference    Z. Naturforsch. 35b, 372—375 (1980); eingegangen am 26. November 1979 
  Published    1980 
  Keywords    Heterocycles, Organic Sulfur Compounds, a-Oxothiones, 1, 3-Dithietans, 1, 3-Oxathiols, Photoreactions 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0372.pdf 
 Identifier    ZNB-1980-35b-0372 
 Volume    35 
18Author    Josef Hahn, Tina NatanielRequires cookie*
 Title    Synthese und Eigenschaften von 3,6-Diorgano-3,6-dithio  
 Abstract    l,2,4,5,3,6-tetrathiadiphosphorinanen; eine neue Möglichkeit zur Knüpfung von S—S-Bindungen Synthesis and Properties of 3,6-D iorgano-3,6-dithio-l,2,4,5,3,6-tetrathiadiphosphorinanes; a New Possibility of Forming S—S Bonds 
  Reference    Z. Naturforsch. 42b, 1263 (1987); eingegangen am 15. Mai 1987 
  Published    1987 
  Keywords    3, 6-Diorgano-3, 6-dithio-l, 2, 4, 5, 3, 6-tetrathiadiphosphorinanes, 3, 5-Dimethyl-3, 5-dithio-l, 2, 4, 3, 5-trithiadiphospholan, Heterocycles, Formation of S -S Bonds 
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 TEI-XML for    default:Reihe_B/42/ZNB-1987-42b-1263.pdf 
 Identifier    ZNB-1987-42b-1263 
 Volume    42