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Facet   section ZfN Section B:Volume 036  [X]
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1981 (332)
101Author    Karlheinz Sünkel, Herbert Ernst, Wolfgang BeckRequires cookie*
 Title    Metallorganische Lewissäuren, V [1] Reaktionen von Carbonyl-^ -cyclopentadienylmolybdä ntetrafluoroboraten Carbonyl-?? 5 -Cyclopentadienyl Molybdenum Complexes, Tetrafluoroborate Complexes, Cationic Organometallic Lewis Acids  
 Abstract    T] 5 -C5H5)MO(CO)2(L)FBF3 (L=CO, PR3) mit Phosphanen und Alkenen Organometallic Lewis Acids, V [1] Reactions of Carbonyl-^ 5 -cyclopentadienyl Molybdenum Tetrafluoroborates (r/ 5 -C 5 H5)Mo(CO)2(L)FBr3 (L = CO, PR3) with Phosphanes and Alkenes Tetrafluoroborate complexes (ty 5 -CsH5)Mo(CO)2(PR3)FBF3 have been prepared by hydride abstraction from the corresponding hydrido compounds using Ph3CBF4. The tetrafluoroborate ligand in (7j 5 -C5H5)Mo(CO)2(L)FBF3 (L = CO, PR3) is easily sub-stituted by phosphanes, eis-and £rans-butene(2), a-acetamidocinnamic acid and buta-diene. Nucleophilic addition of HNMe2 to the butadiene complex [(7j 5 -CsH5)Mo(CO)3 butadiene)] + BF4~ gives the ß-aminoacyl chelate compound 7. 
  Reference    Z. Naturforsch. 36b, 474—481 (1981); eingegangen am 5. Dezember 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0474.pdf 
 Identifier    ZNB-1981-36b-0474 
 Volume    36 
102Author    Joseph Grobe, Heinz Zimmermann, FrauRequires cookie*
 Title    Elektrochemische Synthesen, VII [1]  
 Abstract    Elektrochemische Substitutionsreaktionen an M(CO)6_n(PR3)M-Komplexen (M = Cr, Mo, W) Electrochemical Syntheses, VII [1] Electrochemical Substitution Reactions of M(CO)6-n(PR3)n Complexes (M = Cr, Mo, W) The principle of electrochemical substitution of metal carbonyls has been applied to monosubstituted derivatives M(CO)5PR3 (M = Cr, Mo, W) with the aim of selective prepa-ration of di-and trisubstituted products M(CO)4(PR3)(PR'3) or M(CO)3(PR3)(PR'3)2. It is shown that, due to simultaneous replacement of CO and PR3 mixtures of products are formed. 
  Reference    Z. Naturforsch. 36b, 482—484 (1981); eingegangen am 24. Oktober 1980 
  Published    1981 
  Keywords    Electrochemical Synthesis, Metal Carbonyl Derivatives, Phosphane Ligands 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0482.pdf 
 Identifier    ZNB-1981-36b-0482 
 Volume    36 
103Author    EricaL. Weinberg, J.Thomas Burton, MichaelC. Baird, Max HerberholdRequires cookie*
 Title    A Novel Isomerization of an Electron-Rich Alkene  
 Abstract    Displacement of 2-methvlpropene from [Fp(Me2C = CH2)]BF4 (Fp = (/?5-C5H5)Fe(CO)2) by Z-1,2-dimethoxyethylene (Z-DME) gives [Fp(Z-DME)]BF4. Displacement by E-1,2-dimethoxyethylene (E-DME), in contrast, does not give the expected complex of E-DME, but rather the complex of the Z-alkene. A mechanism involving scission of the C = C bond of the coordinated alkene to give a bis-carbene intermediate is proposed. 
  Reference    Z. Naturforsch. 36b, 485—487 (1981); received February 9 1981 
  Published    1981 
  Keywords    Organoiron Complexes, Olefin Isomerization, 1, 2-Dimethoxyethylene 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0485.pdf 
 Identifier    ZNB-1981-36b-0485 
 Volume    36 
104Author    Reinhard Benn, Werner RiemerRequires cookie*
 Title    Two-Dimensional (2D-J) NMR Spectroscopy for Analysis of Isomers and Heterocouplings  
 Abstract    The use of two-dimensional NMR spectroscopy (2D-J) for the identification of isomers and heterocouplings is demonstrated. The routine application of this new method to practical NMR problems is discussed. 
  Reference    Z. Naturforsch. 36b, 488—491 (1981); received November 27 1980 
  Published    1981 
  Keywords    2-Dimensional NMR, Stereoisomers, Heterocouplings 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0488.pdf 
 Identifier    ZNB-1981-36b-0488 
 Volume    36 
105Author    Rolf Gleiter, Richard BartetzkoRequires cookie*
 Title    The Structures of S4N e , S3N202 and S4N3 e  
 Abstract    Part of the potential surface of S4N e has been investigated using the MNDO method. It is found that the cis-trans isomer lb is more stable by 20-30 kJ/mol than the trans-trans isomer (1 c) and the cis-cis isomer (1 a). The stability of 1 b is traced back to stabilization of the HOMO and to a Coulomb attraction. For S3N2O2 (2) the MNDO calculations favour those isomers (2a and 2b) with two sickle-like arrangements for the same reasons. For S4N3 e (3) only one isomer (3a) is favoured due to the stabilization of the HOMO. The similarity in the transannular interaction present in 1-3 and that in trithiapentalenes and related compounds is pointed out. The PE spectrum of 2 has been reinvestigated. The first five bands can be interpreted by comparison between the measured ionization potentials and the calculated (MNDO) orbital energies. 
  Reference    Z. Naturforsch. 36b, 492—497 (1981); received December 22 1980 
  Published    1981 
  Keywords    Structural Isomers, MNDO Calculations, Transannular Interactions 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0492.pdf 
 Identifier    ZNB-1981-36b-0492 
 Volume    36 
106Author    MichaelC. Böhm, Rolf GleiterRequires cookie*
 Title    The Fluctional Behaviour of the P7 Trianion -A Molecular Orbital Study  
 Abstract    The degenerate rearrangement of P? 3-has been studied by means of the MINDO/3 method. The calculated enthalpy of activation (A H+ = 59.12 kJ/mol) is in good agreement with results from 31 P NMR studies at different temperatures. The bond switching process starts with a bond rupture leading to a transition state with C2v symmetry. Possible rearrangements in PßS 2-and PßCH 2-are discussed. 
  Reference    Z. Naturforsch. 36b, 498—500 (1981); received December 22 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0498.pdf 
 Identifier    ZNB-1981-36b-0498 
 Volume    36 
107Author    A.F A Shalaby, M.A Abdel Aziz, S.S M BoghdadiRequires cookie*
 Title    Cyclisation of l-Phenyl-4-carboxymethylmercapto-5-arylazo-hydantoins  
 Abstract    Arylazo Compounds, Mannich Bases l-Phenyl-4-carboxymethylmercapto-5-arylazo-hydantoin derivatives (3a-f) were cy-clised with acetic anhydride to give the bicyclic products (4a-f). Compounds 4 a, b condensed with aromatic aldehydes in acetic acid and in presence of anhydrous sodium acetate yielding the corresponding arylidene derivatives (5a-c). Compounds 4a, b also couple with aryldiazonium salts to give the expected coloured arylazo compounds (6a-j). 4 a, b reacted with formaldehyde and primary aromatic amines in ethanol to give the corresponding Mannich bases (7a-f). 
  Reference    Z. Naturforsch. 36b, 501—504 (1981); received November 26 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0501.pdf 
 Identifier    ZNB-1981-36b-0501 
 Volume    36 
108Author    Macki Kaloga, Ilona ChristiansenRequires cookie*
 Title    Photodimerisierung von 6-fra/is-Styryl-4-methoxy-2-pyron (= 5.6-Dehydrokawain), 1. Mitteilung Photodimerisation of 64raw6-Styryl-4-methoxy-2-pyrone (= 5,6-Dehydrokawain)  
  Reference    Z. Naturforsch. 36b, 505—507 (1981); eingegangen am 22. Dezember 1980 
  Published    1981 
  Keywords    Piper methysticum G Forst, Photodimerisation, 5, 6-Dehydrokawain, /?-Truxinic Acid Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0505.pdf 
 Identifier    ZNB-1981-36b-0505 
 Volume    36 
109Author    Bruno KamberRequires cookie*
 Title    Beiträge zur Synthese von Cystinpeptiden, dargestellt am Beispiel der Totalsynthese von Humaninsulin* Contributions to the Synthesis of Cystine Peptides Illustrated by the Total Synthesis of Human Insulin  
 Abstract    Dieser Beitrag ist dem Andenken an Professor Leonidas Zervas, dem Mitarbeiter Max Bergmanns, Altmeister der Peptidsynthese und' Träger der ersten Max-Bergmann-Medaille gewidmet 
  Reference    Z. Naturforsch. 36b, 508—514 (1981); eingegangen am 26. Januar 1981 
  Published    1981 
  Keywords    Asymmetrical Cystine Peptides, Iodine Oxidation, Selective Sulfur Protection, Human Insulin 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0508.pdf 
 Identifier    ZNB-1981-36b-0508 
 Volume    36 
110Author    OttoJ. Scherer, Herbert ConradRequires cookie*
 Title    New Phospha(III)azenes  
 Abstract    The interaction of RR'N-PC12 (1) with LiNR"SiMe3 gives monomeric phospha(IH)-azenes RR'N-P=N-R"; R = R"=i-C3H7, R'= (CH3)3C (3a); R=;-C3H7,R'=R" = (CH3)3C (3b); R = i-C3H7, R' = (CH3)3C, R"=(CH3)3Si (3 c) as distillable liquids. 3 a adds PC13 with formation of RR'N-PC1-NR-PC12, R = i-C3H7, R'=(CH3)3C (6). 
  Reference    Z. Naturforsch. 36b, 515—517 (1981); eingegangen am 5. Februar 1981 
  Published    1981 
  Keywords    Phospha(III)azenes, NMR Spectra, PCI3 -Addition, Amino -halo -phosphines 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0515_n.pdf 
 Identifier    ZNB-1981-36b-0515_n 
 Volume    36 
111Author    D. Fenske, A. ChristidisRequires cookie*
 Title    Reaction of (^ 3 -Altyl)(r; 5 -cyclopentadienyl) Palladium with 2.3 -Bis (dipheny lphosphino) maleic Anhydride  
 Abstract    Insertion of Cyclopentadien into a P-C bond, Crystal Structure (j? 3 -Ally 1) (rj 5 -cyclopentadienyl) palladium reacts with bis(diphenylphosphino)maleic an-hydride to form a complex in which the C5H5 ligand is inserted into a P-C bond of the phos-phine ligand. The high yield (>95%) suggests that this reaction takes place within the co-ordination sphere of palladium. The structure is studied by x-ray crystal structure analysis. 
  Reference    Z. Naturforsch. 36b, 518—520 (1981); eingegangen am 19. Dezember 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0518_n.pdf 
 Identifier    ZNB-1981-36b-0518_n 
 Volume    36 
112Author    Günther EulenbergerRequires cookie*
 Title    Tl4Ge4Seio, ein Thallium(1)selenogermanat mit adamantananalogem Anion [Ge4Seio] 4_ Tl4Ge4Seio, a Thallium(I) Selenogermanate with the Adamantane-Like Anion [Ge4Seio] 4 ~  
 Abstract    Tl4Ge4Seio crystallizes in space group C 2/c with a = 15.602(6), b = 15.549(5), c = 9.052(3) A, ß — 107.10(3)° and Z = 4. The compound was prepared by fusion of a stoichiometric mixture of T^Se and GeSe2. The crystal structure is characterized by adamantane-like anions [Ge4Seio] 4 ~ and T1+ cations. Tl4Ge4Seio is iso-structural with TLiGe4Sio [1]. 
  Reference    Z. Naturforsch. 36b, 521—523 (1981); eingegangen am 6. Februar 1980 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0521_n.pdf 
 Identifier    ZNB-1981-36b-0521_n 
 Volume    36 
113Author    Gaertn, Macki KalogaRequires cookie*
 Title    Isolierung von Dihydrokämpferol aus Silybum marianum L  
 Abstract    Dihydrokaempferol ((2R, 3R)-2-(4-Hydroxy-phenyl)-3,5,7-trihydroxy-4-chromanon) has been isolated from the fruit of Silybum marianum L. Gaertn. and identified by UV, CD, MS and PMR spectra. 
  Reference    Z. Naturforsch. 36b, 524—525 (1981); eingegangen am 1. August/22. Dezember 1980 
  Published    1981 
  Keywords    Silybum, Asteraceae, Flavanonole, Dihydrokaempferol 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0524_n.pdf 
 Identifier    ZNB-1981-36b-0524_n 
 Volume    36 
114Author    G. Flaskamp, 0. Nonnenmacher, IsaacRequires cookie*
 Title     
 Abstract    Die Tabelle auf S. 117 lautet folgendermaßen: Myo-porum ppm Popu-lus ppm Vanillos-mopsis ppm (<5) Multi-plizi-tät Zuordnung bei 20 MHz und ca. 
  Reference    Z. Naturforsch. 36b, 526 (1981) 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0526_e.pdf 
 Identifier    ZNB-1981-36b-0526_e 
 Volume    36 
115Author    Marianne Baudler, Siegfried KlautkeRequires cookie*
 Title    Beiträge zur Chemie des Phosphors, 103 [1, 2] Tri-tert-butyl-diphosphaarsa-cyclopropan, (J-BUP)2 (F-BuAs) Contributions to the Chemistry of Phosphorus, 103 [1, 2] Tri-tert-butyl-diphosphaarsa-cyclopropane, (f-BuP)2(£-BuAs)  
 Abstract    Tri-2er£-butyl-diphosphaarsa-cyclopropane, Cyeloarsaphosphanes, Heterocyclophosphanes The first three-membered P2AS heterocycle, tri-ferf-butyl-diphosphaarsa-cyclopropane (tri-ter£-butyl-diphosphaarsirane) (1) was synthesized by [2+1] cyclocondensation of K(£-Bu)P-P(J-Bu)K with *-BuAsCl2 in n-pentane at — 78 °C. Tetra-*er*-butyl-l,2-di-phospha-3,4-diarsa-cyclobutane (2), tetra-£er£-butyl-triphosphaarsa-cyclobutane (3) as well as (<-BUP)4 and five-membered cycloarsaphosphanes are also formed. The diphospha-arsa-cyclopropane 1 could be isolated in a pure state. It forms two diastereomers, of which the isomer with £rans-oriented ferf-butyl groups at the phosphorus atoms is the most stable. The 31 P NMR parameters of the four-membered cycloarsaphosphanes 2 and 3 are re-ported. 
  Reference    Z. Naturforsch. 36b, 527—531 (1981); eingegangen am 30. Januar 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0527.pdf 
 Identifier    ZNB-1981-36b-0527 
 Volume    36 
116Author    H. Haeuseler, A. Cansiz, H. D. LutzRequires cookie*
 Title    Zur Kenntnis des Aluminiumsulfids: a-Al2S3 und Al2S3(tetr.) On Aluminium Sulfide: a-Al2S3 and Al2S3(tetr.)  
 Abstract    Tetragonal aluminium sulfide crystallizing with the spinel defect structure of the /S-In2S3 type has been prepared at ambient pressure. IR and Raman spectra of this compound and of C1-AI2S3 are reported and discussed in relation to their crystal structures. 
  Reference    Z. Naturforsch. 36b, 532—534 (1981); eingegangen am 19. Januar 1981 
  Published    1981 
  Keywords    Aluminium Sulfide, IR Spectra, Raman Spectra, Spinel Defect Structure 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0532.pdf 
 Identifier    ZNB-1981-36b-0532 
 Volume    36 
117Author    Willy GomblerRequires cookie*
 Title    NMR-spektroskopische Untersuchungen an Chalkogenverbindungen, II [1] 12o Te-, 77 Se-, 19 F-und 13 C-chemische Verschiebungen von CF3-substituierten Selen-und Tellurverbindungen [2] NMR Spectroscopic Studies on Chalcogen Compounds, II [1] 125 Te, 77 Se, »F and * 3 C Chemical Shifts of CF3 Substituted Selenium and Tellurium Compounds [2]  
 Abstract    77 Se chemical shifts of compounds CF3SeX exhibit an extraordinary good linear correla-tion with Huggins' electronegativities of X, %x-A range of 1051 ppm is covered for yx values between 1.9 and 3.15. Effective electronegativities are derived from the <5(77 Se) values. For some compounds unexpected 77 Se chemical shifts are found. This indicates an uncommon electronic constitution at selenium. Electron excitation energies are reported for some of the compounds and their importance for the paramagnetic shielding term is discussed. The relative shieldings of the tellurium compounds are analogous to those of the corresponding selenium compounds. In contrast to 77 Se, the 19 F shieldings of CF3EX compounds (E = chalcogen) depend inversely on the electronegativity of E and X. The 13 C chemical shifts do not correlate with the xx values. NMR data of some CF3Se(IV) and CF3Te(IV) compounds are also reported for comparison. 
  Reference    Z. Naturforsch. 36b, 535—543 (1981); eingegangen am 21. Januar 1981 
  Published    1981 
  Keywords    NMR Spectra, Trifluoromethyl Group, Selenium, Tellurium 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0535.pdf 
 Identifier    ZNB-1981-36b-0535 
 Volume    36 
118Author    Joachim Fuchs, Axel Thiele, Rosemarie PalmRequires cookie*
 Title    Structure and Vibrational Spectrum of the a-Undecatungstophosphate Na2[N(CH3)4]4HPWii039 * 7 H20  
 Abstract    The crystal structure of the compound Na2[N(CH3)4]4HPWn039 • 7H20 was solved by X-ray diffraction. It crystallizes in the space group C2/m with lattice parameters a= 23.895 Ä, b = 11.417 A, c = 28.930 A, ß= 126.0°. The distances between the tungsten atoms and the kind of bridging by oxygen atoms prove the a-isomer. The differences between the vibration spectra of a-undecatungsto-phosphate and a-dodecatungstophosphate are discussed. 
  Reference    Z. Naturforsch. 36b, 544—550 (1981); eingegangen am 2. Februar 1981 
  Published    1981 
  Keywords    a-Undecatungstophosphate, X-ray, Vibrational Spectra, Thermogravimetry 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0544.pdf 
 Identifier    ZNB-1981-36b-0544 
 Volume    36 
119Author    Gilbert Brands, Alfred GollochRequires cookie*
 Title    Schwefel-Stickstoff-Verbindungen, VIII a Darstellung und Charakterisierung einiger aromatischer Schwefeldiimide Sulfur-Nitrogen-Compounds, VIII a Synthesis and Characterization of Some Aromatic Sulfurdiimines  
 Abstract    Sulfurdiimines The missing compounds of the series of sulfurdiimines R 1 -N = S = N-R 2 with R 1 / 2 = CßHö, CßFö, CÖHÖS, CßFöS were prepared, and all ten compounds investigated. Thermal stability, UV/VIS-, IR-and 19 F-NMR-spectra depend strongly on the combination of the substituents. 
  Reference    Z. Naturforsch. 36b, 551—555 (1981); eingegangen am 2. Januar/27. Februar 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0551.pdf 
 Identifier    ZNB-1981-36b-0551 
 Volume    36 
120Author    Jürgen Werner, Wolfgang Schwarz, Armin SchmidtRequires cookie*
 Title    Additionsverbindungen aus Trimethylstibindihalogeniden und Antimon(III)-halogeniden Addition Compounds of Trimethylstibine Dihalogenides and Antimony(III) Halogenides  
 Abstract    Antimony(V) Antimony(III) Addition Compounds Trimethylstibine dichloride and dibromide, resp., react with antimony(III) chloride and bromide, resp., to yield the 1:1 addition compounds (CH3)3SbCl2 • SbCl3 (1) and (CH3)3SbBr2 • SbBr3 (2). The crystal and molecular structure of 1 and 2 are determined by X-ray analysis, the Raman spectra discussed and assigned. 
  Reference    Z. Naturforsch. 36b, 556—560 (1981); eingegangen am 11. Februar 1981 
  Published    1981 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0556.pdf 
 Identifier    ZNB-1981-36b-0556 
 Volume    36 
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