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Facet   Publication Year 1980  [X]
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1980[X]
41Author    Reinhard Benn, Borislay Bogdanović, Peter Göttsch, Klaus SchlichteRequires cookie*
 Title    ?/ 3 -Allyl-hydrogensulfidoiiickel(II)-Korapi exe ?y 3 -Allyl-hydrogensulfidonickel(II) Complexes  
  Reference    Z. Naturforsch. 35b, 200—206 (1980); eingegangen am 10. September 1979 
  Published    1980 
  Keywords    ?7 3 -Allyl-hydrogensulfidonickel(II) Complexes, Stereoisomers, Metal Sulfide Catalysts, NMR Spectra, Deuterium Labeling 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0200.pdf 
 Identifier    ZNB-1980-35b-0200 
 Volume    35 
42Author    Helmut Schwarz, Chrysostomos Wesdemiotis, Thomas Weiske, Klaus-Peter Zeller, Roland MüllerRequires cookie*
 Title    H. Schwarz et al. * Methyl-Eliminierung aus dem metastabilen Homoadamantan-Radikalkation 219 Methyl Loss from Metastable Homoadamantane Cation Radical  
 Abstract    It is demonstrated that methyl loss from ionized homoadamantane (1) yields exclusively the 1-adamantyl cation (4); there is no experimental evidence for the formation of the secondary adamantyl cation (5). From both model calculations and the investigation of [4-13 C]-homoadamantane (la) and l(13 C-methyl)adamantane (2a) it is concluded, that 24% of the metastable homoadamantane cation radicals dissociate after one isomerization (1 2); the remaining 76% are able to undergo at least a second (degenerate) isomerization cycle (2->l->2) prior to methyl loss. 78% of metastable 1-methyl-adamantane cation radical, obtained upon direct ionization of the corresponding neutral hydrocarbon, dissociate directly, whereas the loss of methyl from the remaining 22% is preceded by an isomerization 2 ->1 ->2. 
  Reference    Z. Naturforsch. 35b, 207—211 (1980); eingegangen am 23. Oktober 1979 
  Published    1980 
  Keywords    Ion Structures, Carbocation Rearrangements, Hydrocarbon Chemistry, Mass Spectrometry, Collisional Activation 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0207.pdf 
 Identifier    ZNB-1980-35b-0207 
 Volume    35 
43Author    J. Ulrich, M. J. Bobenrieth, R. Derbyshire, F. Finas, A. Guy, F. Odin, M. Polverelli, R. TéouleRequires cookie*
 Title    Pyrolysis Mass Spectrometry of Protected Phosphotriester Oligodeoxyribonucleotides  
 Abstract    Phosphotriester Protected Oligodeoxynucleotide, Pyrolysis Mass Spectrometry Pyrolysis mass spectrometry is shown to be a useful tool in the analysis of the protected intermediate deoxy oligonucleotides synthesized by the phosphotriester approach. Characteristic ions of the protected nucleic acid bases and terminal substituents appear in the mass fragmentation pattern which allows a rapid control of the attachment of the polynucleotide block in the chemical synthesis. 
  Reference    Z. Naturforsch. 35b, 212—216 (1980); received July 16 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0212.pdf 
 Identifier    ZNB-1980-35b-0212 
 Volume    35 
44Author    Jan Bergman, Lars EngmanRequires cookie*
 Title    Tellurium in Organic Synthesis, VII [1] Novel Synthesis of Telluroesters  
 Abstract    Four substituted tellurobenzoic acid-Te-esters (la-Id) have been synthesized by a phase transfer technique from substituted benzoyl chlorides and sodium telluride. 
  Reference    Z. Naturforsch. 35b, 217—218 (1980); received October 4 1979 
  Published    1980 
  Keywords    Sodium Telluride, Benzoyl Chlorides, Phase Transfer Technique 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0217.pdf 
 Identifier    ZNB-1980-35b-0217 
 Volume    35 
45Author    Hans Achenbach, Bernd RaffelsbergerRequires cookie*
 Title    Alkaloide in Tabernaemontana-Arten, XI [1]  
 Abstract    Untersuchung der Alkaloide von Tabernaemontana quadrangularis — (20R)-20-Hydroxyibogamin, ein neues Alkaloid aus T. quadrangularis Alkaloids in Tabernaemontana Species, XI [1] Investigation of the Alkaloids from Tabernaemontana quadrangularis — (20R)-20-Hydroxyibogamine, a New Alkaloid from T. quadrangularis Alkaloids, Tabernaemontana quadrangularis From the methanolic extract from the roots of T. quadrangularis we isolated 14 alkaloids (1-14) and deduced their structures. All the alkaloids are of the ibogamine-type or im-mediately related to it; (20R)-20-hydroxyibogamine (5) was found for the first time as a natural product. 
  Reference    Z. Naturforsch. 35b, 219—225 (1980); eingegangen am 12. September 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0219.pdf 
 Identifier    ZNB-1980-35b-0219 
 Volume    35 
46Author    H. Budzikiewicz, H. ThomasRequires cookie*
 Title    27-p-Cumaroxy-ursolsäure, ein neuer Inhaltsstoff von Ilex aquifolium L. [1] 27-p-Cumaroxy Ursolic Acid -a New Constituent of Ilex aquifolium L. [1]  
 Abstract    27-p-Cumaroxy Ursolic Acid, Ilex aquifolium L. The structure elucidation of 27-p-cumaroxy ursolic acid is described. Aus den Früchten von Ilex aquifolium L. konnte ein neuer Triterpenester, 27-p-Cumaroxy-ursolsäure (1, Z/E-Gemisch lz und 1E) isoliert werden. Über die Strukturaufklärung wird im folgenden berichtet. Die veresternde p-Cumarsäure (Z/E-Gemisch) ließ sich durch Vergleich der NMR-und Massenspektren mit denen von authentischem Material identifizieren. Das Vorliegen der Z-bzw. E-Form gibt sich auch in den Estern durch die Lage der Olefinsignale in den 
  Reference    Z. Naturforsch. 35b, 226—232 (1980); eingegangen am 27. August 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0226 
 Volume    35 
47Author    Edgar HoferRequires cookie*
 Title    Photoisomerisierung von /rans-l-(3.5-Di-£er£-butyl-4-hydroxyplienyl)-2-phenyldiazeii Photoisomerization of fraws-l-(3,5-Di-te?-^butyl-4-hydroxyphenyl)-2-phenyldiazene  
 Abstract    Tautomeric Diaryldiazenes, Light Induced Isomerizations Light induced isomerizations of the title compound have been studied. The thermal cis-trans isomerization 3->-l occurs via the tautomeric quinonephenylhydrazone (2) as shown by *H NMR, spectroscopy. The influence of solvent on the thermal cis-trans isomerization is discussed. NMR data of 1, 2 and 3 are given. Values of the tautomeric equilibrium 1^2 are determined for various solvents and different temperatures. 
  Reference    Z. Naturforsch. 35b, 233—236 (1980); eingegangen am 31. Oktober 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0233 
 Volume    35 
48Author    Martin JansenRequires cookie*
 Title    Further Compounds A3NO3: K3NO3 and Rb3N03  
 Abstract    K3N03 and RbsNOa were prepared by solid state reaction of equimolar mixtures of K2O/KNO2 and Rb20/RbN02, respectively. According to X-ray powder photographs their crystal structures are derived from the perovs-kite structure. K3N03 is isostructural with Na3N03 (a = 521.7 pm, Z = 1), Rb3N03 represents a tetragonally distorted variant with a = 770.5, c = 550.8 pm and Z = 2. 
  Reference    Z. Naturforsch. 35b, 237—238 (1980); eingegangen am 22. Oktober 1979 
  Published    1980 
  Keywords    Alkalioxidnitrites, Preparation, Crystal Data 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0237_n.pdf 
 Identifier    ZNB-1980-35b-0237_n 
 Volume    35 
49Author    Wilhelm Kuchen, Reinhard UppenkampRequires cookie*
 Title    und Platinkomplexen [RR PS2]2M [2] Metal Complexes of Phosphinic Acids, XVI [1] cis-trans Isomers of Planar Palladium and Platinum Complexes [RR'PS2]2M [2]  
 Abstract    Planar Pd(II)-and Pt(II)-dithiophosphinates cis-trans Isomers of planar Pd(II)-and Pt(II)-dithiophosphinates, Metal Chelates, 3iP-{iH} NMR 
  Reference    Z. Naturforsch. 35b, 239—241 (1980); eingegangen am 8. Oktober 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0239_n 
 Volume    35 
50Author    Hans-Ulrich Kreusler, Achim Förster, Joachim FuchsRequires cookie*
 Title    Die Struktur des Rubidiumtrimolybdathydrats Rb2Mo3O10 * H20 The Structure of the Rubidiumtrimolybdate Hydrate Rb2Mo3Oi0 * H20  
 Abstract    For the first time single crystals of tri-molybdate were obtained through a slow trans-formation of the primary precipitate in a slightly acidified solution of rubidium molybdate at a temperature of 70 °C. A structural analysis of Rb2Mo30io • H20 revealed that the anion forms a chain with a hexameric identity period built up from MoOg octahedra. Each Mo atom is bonded with two terminal oxygen atoms. The anion doesn't contain OH groups. 
  Reference    Z. Naturforsch. 35b, 242—244 (1980); eingegangen am 3. September/8. November 1979 
  Published    1980 
  Keywords    Trimolybdate, Single Crystal, Preparation, X-ray 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0242_n.pdf 
 Identifier    ZNB-1980-35b-0242_n 
 Volume    35 
51Author    Uwe Hillebrand, Eberhard StumppRequires cookie*
 Title    Darstellung und Eigenschaften von Molybdäntetraethoxid Preparation and Properties of Molybdenum Tetraethoxide  
 Abstract    The title compound has been isolated from reaction of M0CI5 and KOEt in ethanol. The presence of bridging alkoxy groups was proved by means of X H NMR spectra. Magnetic suscep-tibility and electronic spectra were measured, and the results are discussed in terms of octa-hedrally coordinated Mo(IV). 
  Reference    Z. Naturforsch. 35b, 245—246 (1980); eingegangen am 30. Oktober 1979 
  Published    1980 
  Keywords    Preparation, Molybdenum Tetraethoxide, Ligand Field Spectrum 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0245_n.pdf 
 Identifier    ZNB-1980-35b-0245_n 
 Volume    35 
52Author    Peter Matje, Günter SchönRequires cookie*
 Title    Ag8SnTe6, ein neuer Vertreter der Argyrodite Ag8SnTe6 -a New Argyrodite  
 Abstract    AggSnTeö has been synthesized by different methods. The Dielectric Absorption Spectra point to a silver ion conductivity. Bei Arbeiten zur dielektrischen Untersuchung des quaternären Ag-Cu-Sn-Te-Systems konnte die Ver-bindung AgsSnTeö erstmals synthetisiert werden. Diese Verbindung ist nach den bisher vorliegenden Daten isotyp zu den schon bekannten argyrodit-analogen Telluriden mit Si und Ge. Nach Arbeiten von Gorochov [1] und anderen Autoren [2, 3] ist im System Ag2Te-SnTe-Te die Verbindung AggSnTee unter deren Bedingungen nicht existent. Es sollte ein Zerfall in mehrere Kom-ponenten wie AgSnTe2, AgzSni-xTe (x < 0,36), Ag5-zTe3 und Ag2Te stattfinden. Das von uns eindeutig als AggSnTee charakteri-sierte Produkt wurde wie folgt dargestellt: Ein stöchiometrisches Gemenge der Elemente (Ag: 99,999%, Sn: 99,999%, Te: 99,99%) wurde in saubersten, getrockneten und vorher evakuierten Quarzampullen eingeschmolzen, danach innerhalb von 24 h auf eine Temperatur von 800 °C geheizt und bei dieser anschließend einen Tag lang gehalten. Nach dem langsamen Abkühlen auf Raumtempera-tur wurde wieder auf diese Temperatur erhitzt, diese einen Tag lang beibehalten und dann innerhalb von zwei Tagen langsam abgekühlt. Das silbriggraue Produkt war gut kristallisiert. Die teilweise stark verwachsenen Kristalle hatten einen oktaedrischen Habitus. Die nach diesem Verfahren synthetisierte Sub-stanz konnte auch mit Spuren Iod als Transport-mittel kristallin erhalten werden (Temperaturen: 820-550 °C substanzseitig). Darüber hinaus gelang es, das nach den oben be-schriebenen Verfahren hergestellte AggSnTee in einer umgebenden B203-Schmelze in offenen Korund-oder Porzellantiegeln an Luft aufzuschmelzen. Zu diesem Zweck wurde innerhalb eines halben Tages auf eine Temperatur von 800 °C aufgeheizt, diese 
  Reference    Z. Naturforsch. 35b, 247 (1980); eingegangen am 31. Oktober 1979 
  Published    1980 
  Keywords    Ternary Chalcogenides, Preparation, Dielectric Spectroscopy 
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 Identifier    ZNB-1980-35b-0247_n 
 Volume    35 
53Author    Reinhard Nast, Amelia SantosRequires cookie*
 Title    Alkynyl Compounds of Transition Metals, XXXVIII [1] Complex Manganese(II) Compounds of 1,2-Diethynylbenzene  
 Abstract    Potassium-bis (1,2-phenylenediethynyl)-manganate (II), Sodium-bis(1,2-phenylenediethynyl)-manganate(II) 
  Reference    Z. Naturforsch. 35b, 248—249 (1980); eingegangen am 16. Oktober 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0248_n.pdf 
 Identifier    ZNB-1980-35b-0248_n 
 Volume    35 
54Author    FranzA. Neugebauer, Hans FischerRequires cookie*
 Title    ESR of a Cyclic Phosphahydrazidinyl  
 Abstract    Hydrazidinyl Radicals, ESR, ENDOR The cyclic phosphahydrazidinyl (5) was gen-erated and studied by ESR. The results are discussed in connection with the properties of other hydrazidinyl radicals. 
  Reference    Z. Naturforsch. 35b, 250—251 (1980); received October 29 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0250_n 
 Volume    35 
55Author    M. =. Ti, K. Rb, Klaus Brodersen, Klaus-Peter Jensen, Gerhard ThieleRequires cookie*
 Title    Über Chloro-und Bromomercurate MHgsXn  
 Abstract    The structure of TlHgsCln, an example of the monoclinic phases MHgsXn (M = TI, K, Rb, Cs, NH4; X = Cl, Br), which are found in the system alkalihalide-mercury(II)halide, was determined by X-ray structure analysis. These compounds are double salts MX • 5 HgX2, because the structure is mainly formed from X-Hg-X units. 
  Reference    Z. Naturforsch. 35b, 253—258 (1980); eingegangen am 14. Dezember 1979 
  Published    1980 
  Keywords    , Cs, NH4, X = Cl, Br) On Chloro-and Bromomercurates MHg5Xu (M = TI, K, Rb, Cs, NH4, X = Cl, Br) Crystal Structure, Chlormercurate, Bromomercurate, Thallium(I) 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0253.pdf 
 Identifier    ZNB-1980-35b-0253 
 Volume    35 
56Author    Klaus Brodersen, Klaus-Peter Jensen, Gerhard ThieleRequires cookie*
 Title    Die Kristallstruktur des Xl10Hg3Cl16 The Crystal Structure of Tli0Hg3Cli6  
 Abstract    The structure of TlioHggClie (tetragonal; space group I4/m; a — 849,0(2) pm, c = 2372,9(6) pm) was determined by X-ray structure analysis. This compound consists of HgCLi tetrahedra and linear Cl-Hg-Cl units, which are completed by four additional chlorides to distorted (2 + 4) HgCle octahedra. A close relationship to the Tl4HgXe structure (X = Br, I) is discussed. 
  Reference    Z. Naturforsch. 35b, 259—264 (1980); eingegangen am 14. Dezember 1979 
  Published    1980 
  Keywords    Crystal Structure, Chloromercurate, Thallium(I) 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0259.pdf 
 Identifier    ZNB-1980-35b-0259 
 Volume    35 
57Author    Rainer Mattes, Karl MühlsiepenRequires cookie*
 Title    MO408((CH3)2P0S)4, ein Molybdän(V)-Sauerstoff-Kuban M0408((CH3)2P0S)4; a Molybdenum(V) Oxygen Cubane  
 Abstract    Thiophosphinato Molybdenum (V) Complexes The tetranuclear complex M0408((CH3)2P0S)4 has been synthetized by reacting M0CI5 with Na((CH3)2POS) in CHCI3/CCI4 solutions. The structures of two crystalline modifica-tions (I and II), containing different amounts of solvent, have been determined by X-ray crystallography. In both, four molybdenum and four oxygen atoms are situated at the corners of a highly distorted cube. Each Mo atom has a terminal oxo group. The Mo atoms form two MO2 pairs through Mo-Mo bonds. The bidentate (CH^POS -ligands coordinate to two Mo atoms of different pairs. The sulfur atoms of the ligands are partially replaced by oxygen atoms. 
  Reference    Z. Naturforsch. 35b, 265—268 (1980); eingegangen am 19. September/10. Dezember 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0265 
 Volume    35 
58Author    Dieter Lux, Wolfgang Schwarz, Heinz Hess, Werner ZeißRequires cookie*
 Title    Die Kristall-und Molekülstruktur zweier spirocyclischer Diazadiphosphetidine The Crystal and Molecular Structure of Two Spirocyclic Diazadiphosphetidines  
 Abstract    The crystal structure of the two spirocyclic diazadiphosphetidines (Me2C202)(Me2N)2P2N2(SiMe3)2 (1) and (Me2C202)2(Me2N)2P2N2(SiMe3)2 (2) were deter-mined. In both compounds the dimethylamino groups are arranged in a eis position with respect to the plane of the four-membered ring. There are no unusually long PN distances in the four-membered ring of 2, although 2 monomerizes easily and quantitatively at room temperature to give 3. 
  Reference    Z. Naturforsch. 35b, 269—274 (1980); eingegangen am 7. November 1979 
  Published    1980 
  Keywords    Spirocyclic Diazadiphosphetidines, Crystal Structure, eis-Isomers 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0269.pdf 
 Identifier    ZNB-1980-35b-0269 
 Volume    35 
59Author    William Clegg, Uwe Klingebiel, Cornelia Krampe, GeorgeM. SheldrickRequires cookie*
 Title    .3-Silylgruppenwanderung im Si2NSiN-Gerüst - Synthese und Molekülstruktur von 1.3-Diaza-2.4-disilacyclobutanen 1,3-Migration of Silylgroups in the Si2NSiN-System - Synthesis and Molecular Structure of l,3-Diaza-2,4-disilacyclobutanes  
 Abstract    N-Organylamino-N',N'-bis(trimethyl)amino-fluoroorganylsilanes react with butyl-lithium to give the corresponding lithium salts. Further reaction of these lithium salts with fluorosilanes leads to the formation of the expected substituted compounds. Diaza-disilacyclobutanes are formed by thermal LiF elimination in THF. The simultaneous 1,3-migration of a trimethylsilyl group from one nitrogen atom to another is demonstrated by the crystal structure determination of the products of two such reactions, with different substituent groups. 
  Reference    Z. Naturforsch. 35b, 275—281 (1980); eingegangen am 26. Oktober/18. Dezember 1979 
  Published    1980 
  Keywords    Lithio-aminofluorosilanes, Silylgroup Migration, Cyclisation, Crystal Structure 
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 Identifier    ZNB-1980-35b-0275 
 Volume    35 
60Author    Josef HahnRequires cookie*
 Title    Beiträge zur Chemie des Silieiums und Germaniums, XXIX [1] 29 Si-NMR-spektroskopische Untersuchungen von geradkettigen und verzweigten Silanen Contributions to the Chemistry of Silicon and Germanium, XXIX [1] 29 Si NMR Spectroscopic Investigations on Straight and Branched Silanes  
 Abstract    29 Si NMR, Silanes, Silicon Hydrides The structure of the straight silanes SinH2n+2 (1 < n < 7) and of the branched isomers isotetrasilane, iso-and neopentasilane, 2-silyl-and 3-silylpentasilane, 2,3-disilyltetra-silane as well as 2-silyl-and 3-silylhexasilane could be unambiguously elucidated by 29 Si NMR spectroscopy. Systematic trends in the chemical shift and coupling parameters were observed and an empirical relationship between <5(29 Si) of a 29 Si nucleus and the number of the neighbouring silicon atoms in a, ß or y position is given. In 1 H decoupled spectra the nuclear Overhauser effect on the 29 Si resonance was found to increase with increasing distance of the 29 Si nucleus from the end of the chain. A complete analysis of the multi spin systems of disilane, trisilane and isotetrasilane was performed and the signs of the 29 Si,H-and H,H-long range coupling constants were determined with regard to the negative sign of 1 J(29 SiH). 
  Reference    Z. Naturforsch. 35b, 282—296 (1980); eingegangen am 30. Oktober 1979 
  Published    1980 
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 Identifier    ZNB-1980-35b-0282 
 Volume    35 
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