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Facet   Publication Year 1980  [X]
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1980[X]
21Author    R. S. Tewari, S. K. Suri, K. C. GuptaRequires cookie*
 Title    Studies on Betaine Decomposition of Arsonium Ylides  
 Abstract    Betaine, Arsonium Ylides A systematic study on the nature of decomposition of betaine formed by nucleophilic attack of semistabilized arsonium ylides on thiocarbonyl substrates has been carried out. A series of substituted benzylidenetriphenylarsenanes have been generated from their corresponding salts and condensed with few cyclic thioketones to yield exocyclic olefins as exclusive products. The non-availability of thioepoxides indicates that the mode of decomposition of such type of betaines is quite analogous to the betaine formed by phosphonium ylides. The structure of the products have been assigned by IR and NMR spectral studies. 
  Reference    (Z. Naturforsch. 35b, 95—98 [1980]; received June 12 1979) 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0095.pdf 
 Identifier    ZNB-1980-35b-0095 
 Volume    35 
22Author    RamS. Tewari, DineshK. NagpalRequires cookie*
 Title    Transylidation Reactions in Arsonium Ylides  
 Abstract    Transylidation Reactions, Arsonium Ylides Some substituted benzylidenetriphenylarsenanes have been generated from their precursors and treated with acid chlorides or acid anhydrides to afford intermediate arsonium salts which in the presence of starting ylides undergo transylidation to give carbonyl stabilized arsonium ylides in fair to good yields. The structures of these stabilized ylides were confirmed on the basis of their spectral data. 
  Reference    (Z. Naturforsch. 35b, 99—101 [1980]; received September 11 1979) 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0099.pdf 
 Identifier    ZNB-1980-35b-0099 
 Volume    35 
23Author    A. M. Dawidar, A. A. Saleh, M. M. Abdel-MalekRequires cookie*
 Title    Hydroxylation of zl 5 -Steroids with N-Bromosuccinimide to 5a,6/3-Diols Arab Republic of Egypt  
 Abstract    N-Bromosuccinimide, Zl 5 -Steroids, Diosgenin, Cholesterol, Stigmastane, Dehydroisoandrosterone The reaction of N-bromosuccinimide with Zl 5 -steroids such as, diosgenin, cholesterol, stigmasterol and dehydroisoandrosterone were studied. It was found that NBS in a solvent mixture of acetone, water and acetic acid (8:1:0.1) oxidises the olefinic bond of all the previous steroidal compounds to the corresponding «ran-sglycollic, 5a,6/?-di-hydroxylic products in about 60% yield at room temperature. 
  Reference    (Z. Naturforsch. 35b, 102—106 [1980]; received September 17 1979) 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0102.pdf 
 Identifier    ZNB-1980-35b-0102 
 Volume    35 
24Author    Norio Miyoshi, Giiti TomitaRequires cookie*
 Title    Fluorescein-photosensitized Furan Oxidation in Methanolic and Reversed Micellar Solutions, Part II Kinetic Analysis  
 Abstract    The 1,3-diphenylisobenzofuran oxidation was investigated in methanolic and dodecyl-ammonium propionate reversed micellar solutions using fluorescein sodium as photo-sensitizer. The furan oxidation was caused by the singlet oxygen mechanism (Type II). Aniline enhanced remarkably the furan oxidation in methanolic solutions, but inhibited highly this oxidation in the reversed micellar solutions. This enhancement of the furan oxidation was considered to be brought about by the occurrence of a radical mechanism (Type I) besides Type II mechanism. No Type I reaction occurred in the micellar solutions. The rate constants concerning with both reaction processes were evaluated by kinetic analysis, employing various aryl-and alkyl-amines. The reaction mechanism of Type I and the quenching mechanism of singlet oxygen by amines were discussed from the relationship between the rate constants, and the ionization potential of amines and the solvent polarity. 
  Reference    (Z. Naturforsch. 35b, 107—111 [1980]; received July 27 1979) 
  Published    1980 
  Keywords    Singlet Oxygen, Radicals, Fluorescein, Diphenylisobenzofuran, Reversed Micelles 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0107.pdf 
 Identifier    ZNB-1980-35b-0107 
 Volume    35 
25Author    D. Layek, G. C. PapavassiliouRequires cookie*
 Title    Some New One-dimensional Compounds: Preparation and Optical Properties  
  Reference    (Z. Naturforsch. 35b, 112—113 [1980]; received June 7/October 2 1979) 
  Published    1980 
  Keywords    Raman Spectra, Preparation, Platinum-mixed Valence 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0112_n.pdf 
 Identifier    ZNB-1980-35b-0112_n 
 Volume    35 
26Author    Rainer Vogel, Hans-Uwe SchusterRequires cookie*
 Title    Ternäre Verbindungen mit modifizierter Ni2In-Struktur KHgAs (Sb) and KZnAs - Ternary Compounds in a Modified Ni2In-Structure  
 Abstract    The compounds KHgAs, KHgSb and KZnAs were prepared and their structures determined by powder and single crystal data. The com-pounds crystallize in a modified Ni2In-type structure, space group P63/mmc-Djfh. The cell parameters are: 
  Reference    (Z. Naturforsch. 35b, 114—116 [1980]; eingegangen am 20. September 1979) 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0114_n.pdf 
 Identifier    ZNB-1980-35b-0114_n 
 Volume    35 
27Author    (. Ato^cl, =. Li, Gerd Meyer, Ellen SchwanRequires cookie*
 Title    Tetrachloroaluminate, -ferrate und -gallate  
 Abstract    -gallates of formulae A I M III CLi with A* = Cs, Rb, In, Tl, NH4 as well as the high temperature forms of the potassium compounds (KM m Cl4-III) crys-tallize with the baryte type structure. LiM in CLi, NaM III Cl4, and KM^C^-II (M»i = AI, Fe, Ga), isotypic among themselves, belong -dependent on the size of the A+ ion -to three different structure types. 
  Reference    (Z. Naturforsch. 35b, 117—118 [1980]; eingegangen am 21. September 1979) 
  Published    1980 
  Keywords    -Cs, NH4, Tl, In, M in = AI, Fe, Ga) Tetrachloroaluminates, -ferrates and -gallates: AiMi»Cl4 (A 1 = Li-Cs, NH4, Tl, In, M m = AI, Fe, Ga) Ternary Chlorides, Aluminates, Ferrates, Gallates Tetrachloroaluminates, -ferrates and 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0117_n.pdf 
 Identifier    ZNB-1980-35b-0117_n 
 Volume    35 
28Author    Heinrich NöthRequires cookie*
 Title    Lithium-tetrahydroaluminat in Ether: eine NMR-Untersuchung Lithiumtetrahydroaluminate in Ether: an NMR Study  
 Abstract    Ether solutions of LiAlH4 have been investigated by 27 Al and 7 Li magnetic resonance in the concentration range 3.75-0.0075 M. The Al-signal shows a fine structure due to Al-H coupling only at concentrations below 0.15 M. The observed chemical shift 27 Al is only slightly concentration dependent. The line width of the 27 A1 signal, which is inversely proportional to T2*, reaches a minimum value at a concentration where the best resolution of the 27 A1 quintet is observed. This, however, is not matched by the 7 Li line width whose minimum value was found at a somewhat higher concentration. The results are consistent with multiple ion formation at the higher concentrations and with an ion pair at low concentrations. 
  Reference    (Z. Naturforsch. 35b, 119—124 [1980]; eingegangen am 7. November 1979) 
  Published    1980 
  Keywords    7 Li NMR, 27 A1 NMR, Relaxation Times, Lithiumtetrahydroaluminate 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0119.pdf 
 Identifier    ZNB-1980-35b-0119 
 Volume    35 
29Author    K. Barlos, Heinrich NöthRequires cookie*
 Title    Beiträge zur Chemie des Bors, CVIII [1] Synthese und Konformation yon N.N'-Bis(boryl)-N.N'-dimethylhydrazinen Contributions to the Chemistry of Boron, CVIII [1] Synthesis and Conformation of N,N , -Bis(boryl)-N,N'-dimethylhydrazines N,N'-Bis(methylboryl)-N,N'-dimethyl-hydrazine, N,N'-Bis(dichlor-boryl)-N,N  
  Reference    (Z. Naturforsch. 35b, 125—132 [1980]; eingegangen am 10. August 1979) 
  Published    1980 
  Keywords    -dimethyl-hydrazine, Conformation, NMR Spectra, PE Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0125.pdf 
 Identifier    ZNB-1980-35b-0125 
 Volume    35 
30Author    DavidW. Allen, IanW. No, PhilipE. WalkerRequires cookie*
 Title    X-ray Structural Study of 5-Phenyl-10,ll-dihydrodibenzo[b,f]phosphepin-5-oxide  
 Abstract    Crystals of the title compound are triclinic, a = 8.533(5), b = 11.106(6), c = 8.815(5) A, a = 107.83(6), ß = 104.99(6), y = 81.30(5)°, Z = 2, space group Pi. The structure was determined by multisolution direct methods and electron density methods. Refinement by least-squares techniques gave a final R = 0.081 for the 1753 independent reflections. The molecule adopts a butterfly-type conformation such that the fused phenyl rings are inclined to each other at an angle of 56.8°. The P-0 bond distance is 1.506(4) A; the endocyclic angle at phosphorus is 107.2(3)° and the exocyclic angles vary from 106.5 to 111.9(3)°. 
  Reference    Z. Naturforsch. 35b, 133—135 (1980); received October 8 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0133.pdf 
 Identifier    ZNB-1980-35b-0133 
 Volume    35 
31Author    Klaus Volk, Gerhard Cordier, Ralph Cook, Herbert SchäferRequires cookie*
 Title    BaSbTe3 und BaBiSe3 Verbindungen mit BiSe-bzw. SbTe-Schichtverbänden BaSbTe3 and BaBiSe3 Compounds with BiSe-or SbTe-Layer Structures, Respectively  
 Abstract    The new compounds BaBiSe3 and BaSbTe3 crystallize in the orthorhombic system, space group P2i2i2i with BaBiSe3: a = 1724 ± 2 pm, b = 1600 ± 2 pm, c = 437.0 ± 0.5 pm; BaSbTe3: a = 1809 ± 2 pm, b = 1694 ± 2 pm, c = 463.5 ± 0.4 pm. BiSeö-or SbTe6-octahedra, resp., are connected by common edges to fourfold strings. These are bound by additional chalcogen atoms to sheets, between which the Ba ions are located. 
  Reference    Z. Naturforsch. 35b, 136—140 (1980); eingegangen am 16. Oktober 1979 
  Published    1980 
  Keywords    Bariumbismutselenide, Bariumantimonytelluride, Crystal Structure 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0136.pdf 
 Identifier    ZNB-1980-35b-0136 
 Volume    35 
32Author    Albrecht MewisRequires cookie*
 Title    Ternäre Phosphide mit ThCr2 Si2 -Struktur Ternary Phosphides with the Th(>2Si2 Structure  
 Abstract    Ten new compounds with the general formula AB2P2 (A = Ca, Sr, Eu, Ba; B — Cu, Ni, Co, Fe, Mn) have been prepared and their structures determined. They are isotypic and crystallize in the ThCr2Si2 structure (space group I4/mmm) with the following constants: CaCui.75P2 
  Reference    Z. Naturforsch. 35b, 141—145 (1980); eingegangen am 23. Oktober 1979 
  Published    1980 
  Keywords    Intermetallic Compounds, Crystal Structure, Ternary Phosphides 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0141.pdf 
 Identifier    ZNB-1980-35b-0141 
 Volume    35 
33Author    Ertugrul Arpac, Lutz DahlenburgRequires cookie*
 Title    Oligophosphin-Liganden, I  
 Abstract    Einfache Synthesen der trimethylenverknüpften Triphosphine RP[(CH2)3PPh2]2 und ihrer Vorstufen Ph2P(CH2)3P(H)R (R Ph, Me) Oligophosphine Ligands, I Convenient Syntheses of the Trimethylene-linked Triphosphines RP[(CH2)3PPh2]2 and their Precursors Ph2P(CH2)3P(H)R (R = Ph, Me) The secondary-tertiary diphosphines Ph2P(CH2)3P(H)Ph (2) and Ph2P(CH2)3P(H)Me (3) have been prepared from Ph2P(CH2)3Cl (1) and NaP(H)Ph or LiP(H)Me, respectively. Metallation of 2 and 3 with n-butyl lithium and further reaction of the lithio-derivatives with one equivalent of 1 yields PhP[(CH2)3PPh2]2 (4) and MeP[(CH2)3PPh2]2 (5). The tritertiary phosphines 4 and 5 have likewise been obtained from RPLi2 (R = Ph, Me) and two equivalents of 1. The synthesis of 4 from PhPCl2 and two equivalents of the Grignard reagent of 1 is also reported. Each of the phosphines 1-5 was characterized by NMR and mass spectroscopy. 
  Reference    Z. Naturforsch. 35b, 146—152 (1980); eingegangen am 26. Oktober 1979 
  Published    1980 
  Keywords    Secondary-tertiary Diphosphines, Tritertiary Phosphines, Preparation, NMR Spectra, Mass Spectra 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0146.pdf 
 Identifier    ZNB-1980-35b-0146 
 Volume    35 
34Author    Gisela Beindorf, Joachim Strähle, Wolfgang Liebelt, Frank WellerRequires cookie*
 Title    Die Kristallstmktiir des Iodnitren-Komplexes C13V = N-I Crystal Structure of the Iodonitrene Complex, ClaV-N-I  
 Abstract    CI3VNI crystallizes isotypically with CI3VNCI in the triclinic space group P I. The crystals contain dimeric units which are formed via chlorine bridges. The VNI group is linear with an sp-hybridized nitrogen and a V-N triple bond, (angle VNI = 163°, V-N = 165 pm, N-I = 193 pm). A short contact distance of 307 pm between the I atom and a neighbouring CI atom is observed. 
  Reference    Z. Naturforsch. 35b, 153—156 (1980); eingegangen am 31. Oktober 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0153.pdf 
 Identifier    ZNB-1980-35b-0153 
 Volume    35 
35Author    Armin Weiss, JinHo ChoyRequires cookie*
 Title    Intercalationskomplexe von Eisen(ni)oxidchlorid FeOCl mit Alkanolen Intercalation Complexes of Iron(III) Oxide Chloride FeOCl with Alkanols Iron(III) Oxide Chloride Intercalation Complexes, Alkanol Intercalates, Thermal Transitions in Intercalation Complexes  
 Abstract    n-Alkanol intercalation complexes of iron(III) oxide chloride FeOCl • a n-CzH^+iOH (x = 1-18) are obtained from the amine intercalates by replacement reaction or by a "propping-open" procedure. The alkanol content is slightly variable with a — 0.54 in the alkanol richest phases and 0.46 after heating to 110 °C. In the alkanol richest phases the long chain alkanol molecules (x < 12) form bilayers in the interlayer region of the FeOCl with the major part of each chain in all trans conformation and perpendicular to the layers of the host lattice. The complexes undergo a series of reversible phase transforma-tions on heating. The arrangement of short chain alkanols (x < 6) is less regular. At higher temperatures (> 130 °C) condensation to FeO(OR)nCli-n is observed. The alkoxy-lated derivatives are also capable of forming intercalation complexes. 
  Reference    Z. Naturforsch. 35b, 157—163 (1980); eingegangen am 17. Oktober 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0157.pdf 
 Identifier    ZNB-1980-35b-0157 
 Volume    35 
36Author    Walter MaringgeleRequires cookie*
 Title    mit mehrfunktionellen Molekülen, XXV [1] Thioureidoborane und Isothioureidoborane Reactions of Metal and Metalloid Compounds with Polyfunctional Molecules, XXV [1] Thioureidoboranes and Isothioureidoboranes  
 Abstract    N,N',N'-Triorganyl-N-trimethylsilylthioureas react with halogeno diorganyl boranes to yield the N,N',N'-organyl-thioureidoboranes 1-7 and isothioureidoboranes 8-15. 10-15 are intramolecularly associated. The compounds are characterized analytically and spectroscopically (NMR: !H, 13C, HB; MS; IR). 
  Reference    Z. Naturforsch. 35b, 164—169 (1980); eingegangen am 14. September/22. Oktober 1979 
  Published    1980 
  Keywords    Trimethylsilylthioureas, Halogendiorganylboranes, Thioureidoboranes, Isothioureidoboranes, Intramolecular Coordination 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0164.pdf 
 Identifier    ZNB-1980-35b-0164 
 Volume    35 
37Author    Winfried Fichtner, Alarich WeissRequires cookie*
 Title    Charge Distribution and Structures of Halogenogallates and Halogenoaluminates of the Type Me I Me III X4, Me T Me2 m X7, and C6H6 CUA1C14. An NQR Investigation ( 35 C1, 79 Br, 127 I, 63 Cu, 69 Ga)  
 Abstract    In polycrystalline samples of the halogenoaluminates Me I AlCl4 (Me 1 — Cu, Ag), CuAlBr4, C6H6 • CUA1C14 and halogenogallates CuGaCl4, Me I GaBr4 (Me 1 = Cu, Na, K, NH4, Rb, Cs, Ga), Me T GaI4 (Me* = Cu, Cs), Me^aaBr? (Me* = K, NH4, Rb, Cs), CsGa2I7, the halogen, Me 111 , and Cu-NQR spectra were studied, partly as a function of temperature. Phase transformations are found in NH4GaBr4, CsGaBr4, and RbGa2Br7. The spectro-scopic results are discussed and a charge distribution analysis is given, based on the Townes-Dailey theory. Symmetry properties of the solids are pointed out in connection with multiplicity and intensity ratios of the NQR spectra. 
  Reference    Z. Naturforsch. 35b, 170—181 (1980); received July 11/November 26 1979 
  Published    1980 
  Keywords    NQR Spectra, Solid State Chemistry, Halogenogallates, Halogenoaluminates 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0170.pdf 
 Identifier    ZNB-1980-35b-0170 
 Volume    35 
38Author    J. Schmitzer, S. Gab, M. Bahadir, F. KörteRequires cookie*
 Title    Photomineralisierung chlorierter Alkane, Alkene und Aromaten an Kieselgel Photomineralization of Chlorinated Alkanes, Alkenes and Aromatics on Silica Gel  
 Abstract    The photodegradation to C02 (photomineralization) of chlorinated alkanes, alkenes and aromatics adsorbed on silica gel was examined. In addition to CO2, CI" and Cl2 were determined. The degradation depends considerably on the activity of the surface and decreases in the order alkenes > alkanes > aromatics. 
  Reference    Z. Naturforsch. 35b, 182—186 (1980); eingegangen am 6. September 1979 
  Published    1980 
  Keywords    Photomineralization, Degradation on Silica Gel, Chlorinated Alkanes, Alkenes, Aromatics 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0182.pdf 
 Identifier    ZNB-1980-35b-0182 
 Volume    35 
39Author    FrankH. KöhlerRequires cookie*
 Title    NMR-Spektroskopie an paramagnetischen Komplexen, XX [1] Störung der 13 C-und ^-Spektren dia-und paramagnetischer Moleküle durch radikalische Metallocene NMR Spectroscopy on Paramagnetic Complexes, XX [1] Errors in the 13 C and Spectra of Dia-and Paramagnetic Molecules Introduced by Metallocene Radicals  
 Abstract    Paramagnetic Metallocenes, Paramagnetic 13 C/ 1 H NMR, Susceptibility Shifts 13 C and *H NMR spectra of ethyl and «-butyl substituted cobaltocenes dissolved in toluene, benzene and acetone are strongly dependent on concentration and temperature. With increasing metallocene concentration and decreasing temperature almost all 13 C and *H signals of the metallocenes as well as those of the solvents are shifted high field to a different degree. The additional shift is most pronounced for substituted aromatic ring carbons giving rise to a seriously disturbed signal ordering. Similar behavior is found for substituted vanadocenes and nickelocenes dissolved in toluene or THF. The effect is attributed to preferred mutual orientation of metallocene and solvent molecules thus inducing additional shifts in the metallocene themselves and in the solvent. From the results it is concluded that neither dipolar nor Fermi contact interaction can satisfactorily account for the effect. Instead it originates from susceptibility shifts which may not be ruled out by internal referencing and which are due to anisotropy and orientation of the molecules. For consequence quantitative comparison of paramagnetic NMR shifts from highly anisotropic molecules is only meaningful if concentrations are known. Measure-ment of magnetic moments may lead to errors. 
  Reference    Z. Naturforsch. 35b, 187—194 (1980); eingegangen am 30. Oktober 1979 
  Published    1980 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0187.pdf 
 Identifier    ZNB-1980-35b-0187 
 Volume    35 
40Author    Lutz Rösch, Gerald AltnauRequires cookie*
 Title    Darstellung und Eigenschaften von Natrium-und Kaliumtetrakis(trimethyl8ilyl)aluminat-Komplexen Preparation and Properties of Sodium and Potassium Tetrakis(trimethylsilyl)aluminate Complexes  
  Reference    Z. Naturforsch. 35b, 195—199 (1980); eingegangen am 31. Oktober 1979 
  Published    1980 
  Keywords    Organosilyl Metal Compounds, Sodium Aluminate Complexes, Potassium Aluminate Complexes 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0195.pdf 
 Identifier    ZNB-1980-35b-0195 
 Volume    35 
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