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1976 (386)
41Author    Walter Siebert, Roland FullRequires cookie*
 Title    Diborylverbindungen als Liganden in Metallkomplexen, III 1 Synthese und Struktur von Bis(2.5-dimethyl-3.4-diäthyl-1.2.5-thiadiborolen)-nickel(0) Diboryl Compounds as Ligands in Metal Complexes, III 1 Synthesis and Structure of Bis (2,5-dimethyl-3,4-diethyl-1,2,5-thiad iborolene) -nickel( 0)  
 Abstract    Bis(l,2,5-thiadiborolene)-nickel(0), Structure, Bonding 2,5-Dimethyl-3,4-diethyl-1,2,5-thiadiborolene (1) and Ni(CO)4 yield yellow 1 • Ni(CO)2, which is converted to the corresponding bis(1,2,5-thiadiborolene)-nickel(0), the first thermo-stable thioborane nickel complex. Spectroscopic data indicate a pentahapto sandwich compound with the electron-donating groups in approximately tetrahedral arrangement. This is confirmed by X-ray structural analysis. The title compound crystallizes in the space group p2i/c with a = 19.594(2), b = 11.8593(4), c = 9.3736(3) Ä, ß = 102.848(6) ° and four molecules per unit cell. 
  Reference    (Z. Naturforsch. 31b, 203—207 [1976]; eingegangen am 31. Oktober 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0203 
 Volume    31 
42Author    Rudolf Weissgerber, KarlE. SchwarzhansRequires cookie*
 Title    Nitroxylradikal-Metallkomplexe Nitroxyl Radical Metal Complexes  
 Abstract    Complexes, Radicalic Ligands, Magnetic Behaviour A series of complexes formed between metal ions and the stable free radicals 3-carboxy -2,2,5,5-tetramethylpyrroline-l-oxyl, 3-carboxy-2,2,5,5-tetramethylpyrrolidine-l-oxyl, 4-amino-2,2,6,6-tetramethylpiperidine-1 -oxyl and glyoxal-bis(2,2,6,6-tetramethyl-4-iminopiperidine-l-oxyl) has been prepared. The magnetic moments and the EPR spectra of the complexes and the free ligands have been investigated. Some of the complexes show a temperature dependent interaction between the radicalic groups of the ligands. 
  Reference    (Z. Naturforsch. 31b, 208—216 [1976]; eingegangen am 14. Juli 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0208 
 Volume    31 
43Author    Richard Kreher, Kurt GothRequires cookie*
 Title    Reaktionen von l-Aryl-3-alkyl-triazenen mit Lewis-Säuren in Benzol* Reactions of l-Aryl-3-alkyl-triazenes with Lewis Acids in Benzene  
 Abstract    l-Phenyl-3-alkyl-triazenes, ^-Fragmentation Reactions, Elektrophilic Substitution Reactions The reaction of l-phenyl-3-alkyl-triazenes with lewis acids in benzene has been examined in order to evaluate the mechanism of the reaction of alkyl azides with electrophiles in benzene. Evolution of nitrogen gives rise to the formation of the corresponding substituted anilines by intramolecular alkylation. Alkyl benzenes are the result of an intermolecular alkylation process. 
  Reference    (Z. Naturforsch. 31b, 217—221 [1976]; eingegangen am 22. August 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0217 
 Volume    31 
44Author    N-N=nRequires cookie*
 Title    (X e © N-N = N N=N cx  
 Abstract    In den 1, w-bifunktionellen Modellverbindungen (2) ist entweder eine konjugative oder eine induktive Wechselwirkung zwischen den funktionellen Grup-pen 5-7 möghch. Bei 1.2-oder 1.4-Stellung der Mole-külfunktionen sollte der mesomere Effekt zum Tragen kommen, während sich in 1.3-oder 1.5-Stellung die gegenseitige Beeinflussung der Substi-tuenten auf den induktiven Effekt beschränken müßte. Zur ersten Gruppe gehören die isomeren o-und p-Azidophenyldiazonium-tetrafluoroborate (3) und (4), bei denen eine Acceptor-Donator-Wechselwir-kung eintreten kann. Beide Vertreter sollten deshalb die Eigenschaften von phenylogen Azido-diazonium-Ionen zeigen 8 . © N = N 2a 2b 
  Reference    (Z. Naturforsch. 31b, 222 [1976]) 
  Published    1976 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0222.pdf 
 Identifier    ZNB-1976-31b-0222 
 Volume    31 
45Author    Mibal Dizdaroglu, Klaus Neuwald, ClemensVon SonntagRequires cookie*
 Title    Radiation Chemistry of DNA Model Compounds, IX* Carbohydrate Products in the y-Radiolysis of Thymidine in Aqueous Solution. The Radical-Induced Scission of the N-Glycosidic Bond  
 Abstract    In the y-radiolysis of deoxygenated N20-saturated aqueous solutions of thymidine (10-3 M, room temperature, dose rate 4 • 10 18 eV/g.h., dose 6.7 10 17 -3.3 • 10 18 eV/g) the following products (G-values in parentheses) have been identified: 2,5-dideoxy-pentos-4-ulose (1) (0.01), 2,4-dideoxy-pentodialdose (2) (0.02), 2,4-dideoxy-pentos-3-ulose (3) (0.03), 2,3-dideoxy-pentos-4-ulose (4) (0.01), 2-deoxy-pentos-4-ulose (5) (0.1), 2-deoxy-ribonic acid (6) (0.02) and thymine (8) (< 0.2). In the presence of oxygen (N20/02 80/20 v/v saturated) products 1-4 are absent, G (5) = 0.2, G (6) = 0.07 and G (8) < 0.4. Further-more, 2-deoxy-tetrodialdose (7) which is absent in deoxygenated solution is formed with a G-value of 0.03. Mechanisms are proposed to account for the scission of the N-glycosidic linkage. Product 6 is thought to be due to a primary OH radical attack at C-l' of the sugar moiety, 3 arises from an attack at C-3', 1, 4 and 5 from an attack at C-4', and 2 and 7 from an attack at C-5'. 
  Reference    (Z. Naturforsch. 31b, 227—233 [1976]; received September 24 1975) 
  Published    1976 
  Keywords    Thymidine, Radiolysis, Radical Reactions, GC-MS, DNA Model Compounds 
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 Identifier    ZNB-1976-31b-0227 
 Volume    31 
46Author    Friedrich Boberg, Rainer VossRequires cookie*
 Title    Markierte Verbindungen, XXII 1 1.2.3.3-Tetrachlor-(1.3-14 C)-l-propen mit unsymmetrischer 14 C-Verteilung On Labelled Compounds, XXII 1 l,2,3,3-Tetrachloro-(l,3-14 C)-l-propene with Unsymmetrical Distribution of 14 C  
 Abstract    1,2,3,3-Tetrachloro-(1,3-14 C)-1 -propene, Bromodichloro-(14 C)methane, l-Bromo-l,2,3,3-tetrachloro-(l,3-14 C)pro-pane, Dichloro-(14 C) Acetic Acid, Dichloro-(14 C)acetanilide 
  Reference    (Z. Naturforsch. 31b, 234—237 [1976]; eingegangen am 9. September 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0234 
 Volume    31 
47Author    Friedrich Boberg, Ferdinand HanischRequires cookie*
 Title    Markierte Verbindungen, XXIII 1 Kinetik des Chloraustausches zwischen Antimon(III)-chlorid und Hexachlorpropen On Labelled Compounds, XXIII 1 Kinetics of the Chlorine Exchange between Antimony(III)-chloride and Hexachloropropene  
  Reference    (Z. Naturforsch. 31b, 238—241 [1976]; eingegangen am 11. September 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0238 
 Volume    31 
48Author    EberhardV. Goldammer, Herbert ZornRequires cookie*
 Title    Binding and Kinetics of 1-Methylimidazol on Fe(III)- Protoporphyrin(IX)dimethylester and Fe(III)-Tetraphenylporphyrin in Chloroform  
 Abstract    NMR, Kinetics, Ferriporphyrins Nuclear magnetic line widths data have been used to determine the rate of solvent exchange between the coordination sphere of Fe(III)-protoporphyrin(IX)dimethylester or Fe(III)-tetraphenylporphyrin and the bulk phase of 1-methylimidazol/chloroform. At temperatures below 322 K both porphyrins are in the low-spin state and separate PMR absorption caused by the methyl protons of two 1-methylimidazol molecules complexed in fifth and sixth position of ferri-porphyrins is detected. At T > 320 K an accelerated ex-change of these ligands was observed and the underlying kinetic parameters have been extracted. It was found that this exchange takes place when the paramagnetic species is in its low-spin state. For 240 K < T < 290 K dynamic line broadening of bulk phase 1-methylimidazol indicates occurrence of chemical exchange attributed to 1 -methylimidazol interacting with ferri-porphyrin in addition to the strongly bound axial ligands. 
  Reference    (Z. Naturforsch. 31b, 242—245 [1976]; received August 27 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0242 
 Volume    31 
49Author    Oswald Adler, Friedhelm KoberRequires cookie*
 Title    Umsetzung yon 2-Dimethylamino-3-methyl-[1.3.2] oxazarsolan mit Protonensäuren Reaction of 2-Dimethylamino-3-methyl-[l,3,2]oxazarsolan with Acid Molecules  
 Abstract    Aminoarsines, Oxazarsolan The reactions of 2-dimethylamino-3-methyl-[l,3,2]oxazarsolane with acid molecules HXR, H2X, HNR2 and H2NR (X = O, S; R = alkyl-group) are examined. IR, NMR and mass spectral data of the obtained arsolanes are discussed. The molecular weight deter-minations and the mass spectra with chemical ionization show an assoziation by As-N-As-or As-X-As-bridges. 
  Reference    (Z. Naturforsch. 31b, 246—250 [1976]; eingegangen am 4. August 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0246 
 Volume    31 
50Author    Günther EntenmannRequires cookie*
 Title    Investigations on Thiazoles, V 1 Thiazolo-[3,2-a]-pyrimidones from 2-Aminothiazole-3-oxides and Esters of Acetylenedicarboxylic Acid  
 Abstract    Heterocyclic N-Oxides, Cycloaddition Products, Thiazolo-[3.2-a]-pyrimidones 2-Aminothiazole-3-oxides react with esters of acetylenedicarboxylic acid to give fluorescent thiazolo-[3,2-a]-pyrimidones. In some cases intermediate rearrangement products can be isolated. Für die folgenden Umsetzungen ist die Isolierung jedoch nicht erforderlich, die Reaktionen erfolgen in situ. 
  Reference    (Z. Naturforsch. 31b, 251—253 [1976]; eingegangen am 30. Oktober 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0251 
 Volume    31 
51Author    Requires cookie*
 Title      
 Abstract    2-Acylbenzimidazole, 2-Cinnamoylbenzimidazoles, Grignard Reagents, Benzimidazolylpyrimidine 2-Acetylbenzimidazole condensed with aldehydes to afford the 2-cinnamoyl derivatives (la-e). Whereas 2-acetyl-and 2-benzoylbenzimidazole added Grignard reagents at the carbonyl group, the 2-cinnamoyl derivatives (la, b) suffered addition at the olefinic double bond to give 2 a, b. Condensation of amines with 2-acetyl and 2-benzoylbenzimidazole yielded the imino compounds (4a-c). 1 a reacted with thiourea to furnish the pyrimidine (5). 
  Reference    (Z. Naturforsch. 31b, 254—256 [1976]; received September 22 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0254.pdf 
 Identifier    ZNB-1976-31b-0254 
 Volume    31 
52Author    Klaus Praefcke, Helmut Schwarz, Christian WeichselRequires cookie*
 Title    Spektroskopische Untersuchungen, X 1 Elektronenstoßinduzierte SO-und C02-Eliminierungen aus N.N-Dimethyl-C-Arylsulfonylformamiden Spectroscopic Investigations, X 1 Electron-impact Induced SO-and C02-Elimination from N.N-Dimethyl-C-arylsulfonylformamides  
 Abstract    Sulfonylformamides, Electron-impact, Spectroscopic Investigations Mass-spectrometric investigations of the titel compounds show for the first time that SO-elimination is also possible from acyclic sulfonyl derivatives. From results of the defocusing technique follows that both this process and the elimination of C02 from the molecular ions are relative slow. Prove of these reactions can be found in the analysis of the metastable ions. These results are supported by substituent effects. 
  Reference    (Z. Naturforsch. 31b, 257—260 [1976]; eingegangen am 4. November 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0257 
 Volume    31 
53Author    N. L. Agabwal, R. L. MitalRequires cookie*
 Title    Proton Magnetic Resonance Spectra of Some Substituted 2-Acylamino-3-arylamino-l,4-naphthoquinones  
 Abstract    N-[3-(p-Chloroanilino)-l,4-dihydro-l,4-dioxo-2-naphthyl]acetamide, N-[l,4-Dihydro-l,4-dioxo-3-(p-toluidino)-2-naphthyl]acetamide, N-[l,4-Dihydro-l,4-dioxo-3-(p-phenetidino)-2-naphthyl]acetamide, N-(l,4-Dihydro-l,4-dioxo-3-morpholino-2-naphthyl)acetamide, PMR The proton magnetic resonance spectra of a number of substituted 2-acylamino-3-arylamino-l,4-naphthoquinones have been measured and discussed. The effect of various substitution pattern and hetero atoms on the chemical shift values of N-acylmethyl protons have been studied and explained. 
  Reference    (Z. Naturforsch. 31b, 261—263 [1976]; received September 9 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0261 
 Volume    31 
54Author    H.E JRequires cookie*
 Title    Synthetic Studies towards Vinblastine and its Analogues, VI The Markownikov Addition of Acetic Acid to Catharanthine by a Modification of the Prevost Reaction ATTA-UR-RAHMAN, NIGHAT WAHEED, and MARYAM GHAZALA  
 Abstract    The reaction of catharanthine under modified prevost reaction conditions has afforded 20-acetoxydihydrocatharanthine, an important intermediate for the synthesis of anti-leukaemic alkaloids, vinblastine and vincristine. 
  Reference    (Z. Naturforsch. 31b, 264—266 [1976]; received September 4 1975) 
  Published    1976 
  Keywords    Vinblastine, Anti-cancer Drugs, Indole Alkaloids, Prevost Reaction 
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 Identifier    ZNB-1976-31b-0264 
 Volume    31 
55Author    Hildebert Wagner, Günter DemuthRequires cookie*
 Title    Untersuchungen über Anthra -Glykoside aus Rhamnus -Arten, IV 1 Die Struktur der Cascaroside von Rhamnus purshianus DC Investigations of the Anthra-glyeosides from Rhamnus species, IV 1 The Structme of the Cascarosides from Rhamnus purshianus DC  
 Abstract    Rhamnus purshianus DC, Cascaroside, Aloin-8-0-/?-D-glucopyranoside, Anthron-C, O-glykoside. The Cascarosides A, B, C and D, for the first time isolated by FAIRBAIRN et al. from the bark of Rhamnus purshianus DC, have been structurally elucidated as 8-0-/3-D-gluco-pyranosides of aloin and 11-desoxy-aloin respectively by means of partial hydrolysis, NMR spectroscopy, sugar analysis and DC measurements. 
  Reference    (Z. Naturforsch. 31b, 267—272 [1976]; eingegangen am 6. Oktober 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0267 
 Volume    31 
56Author    Dieter RehderRequires cookie*
 Title    Substitution of CO for CN~ in Cyclopentadienyl Carbonyl Vanadium Compounds  
 Abstract    Cyclopentadienyl Carbonyl Vanadium Compounds, siY NMR, UV, IR UV irradiation of [Me4N][VCp(C0)3] and [Me4N]CN results in the formation of a complex with zero-valent vanadium which possibly has to be formulated as [Me4N]4[CpV(C0)2CN]2. 
  Reference    (Z. Naturforsch. 31b, 273—274 [1976]; received October 22 1975) 
  Published    1976 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0273_n.pdf 
 Identifier    ZNB-1976-31b-0273_n 
 Volume    31 
57Author    J. B. Clark, Klaus-Jürgen RangeRequires cookie*
 Title    Quenchable High Pressure Phases of DyYbSs High Pressure Phases, Crystal Structures  
 Abstract    Two quenchable high pressure modifica-tions of DyYbS3 are isotypic with U2S3 and Ce2S3 (Defect-TI13P4 type). 
  Reference    (Z. Naturforsch. 31b, 275—276 [1976]; received October 15 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0275_n 
 Volume    31 
58Author    H. Tiltscher, R. LohmüllerRequires cookie*
 Title    High Pressure Reactions, I Evidence for Two Concurrent Mechanisms in Lewis-Acid Catalyzed Alkylation of Aromatics with Olefins  
 Abstract    A kinetic study was made of the primary step of the alkylation of benzene with propy-lene and ferric chloride as catalyst under homogeneous reaction conditions at several pressures up to 2 kbar. Initial reaction rate of cumene formation shows a minimum in the medium pressure range, thus indicating that product formation occurs via two different reaction paths with opposite pressure de-pendence. 
  Reference    (Z. Naturforsch. 31b, 277—278 [1976]; received September 27 1975) 
  Published    1976 
  Keywords    Friedel-Crafts Alkylation, Aromatics, Olefins, High Pressure Kinetics, Concurrent Mechanisms 
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 Identifier    ZNB-1976-31b-0277_n 
 Volume    31 
59Author    R. Tschesche, H. WilhelmRequires cookie*
 Title    Mineralogisch-Fetrologisches Institut der Universität Bonn  
 Abstract    Ziziphus mauritiana Lam. Rhamnaceae, Cyclopeptide Alkaloid, Mauritine-A, X-ray The Constitution and conformation of the known cyclopeptide alkaloid mauritine-A were determined by X-ray diffraction meth-ods. All amino acids belong to the L-series, 3-hydroxy proline has tfrans-configuration. As indicated by the UV-spectrum, the 14-mem-bered ring system is considerably strained. 
  Reference    (Z. Naturforsch. 31b, 279—280 [1976]; eingegangen am 7. Oktober 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0279_n 
 Volume    31 
60Author    Lütz Rösch, Wolfgang Erb, Hartwig MüllerRequires cookie*
 Title    Hinweise auf die Existenz von Trimethylsilylmagnesiumverbindungen Evidence for the Existence of Trimethylsilylmagnesium Compounds  
  Reference    (Z. Naturforsch. 31b, 281—282 [1976]; eingegangen am 24. September 1975) 
  Published    1976 
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 Identifier    ZNB-1976-31b-0281_n 
 Volume    31 
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