Go toArchive
Browse byFacets
Bookbag ( 0 )
Facet   section ZfN Section B:Volume 051  [X]
Results  295 Items
Sorted by   
Publication Year
1996 (295)
61Author    Z. NaturforschRequires cookie*
 Title    Synthese und Dimerisierungsverhalten des l,l-Bis(trimethylsilyl)-2-(2,5-diisopropylphenyl)silens  
 Abstract    Tris(trim ethylsilyl)silylmagnesium bromide, (Me^SiX^SiMgBr, reacts with 2.5-diisopropyl-benzaldehyde to give 2,5-diisopropylphenyl-tris(trimethylsilyl)silylmethanol (1). With sodium 
  Reference    Z. Naturforsch. 51b, 370—3 (1996); eingegangen am 21. August 1995 
  Published    1996 
  Keywords    Silenes, Silene Dimerization, 2, 3-Disilanaphthalenes Tetrahydro, 1, 2-Disilacyclobutanes 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0370.pdf 
 Identifier    ZNB-1996-51b-0370 
 Volume    51 
62Author    G. Em Ot, F. Renkingb, A. Nton, R. Ieker2, Josef Salbeck0, BerndS. Peiser1Requires cookie*
 Title    2,5,8,11-Tetra-terMmtyl-pen-xanthenoxanthene and its Dication Spectroelectrochemistry and Model Calculations on a Dioxa-22-7r-system  
 Abstract    Spectroelectrochemistry of 2,5,8,1 l-tetra-rm-butyl-p^n'-xanthenoxanthene 1 yields the UV/VIS spectra of the corresponding radical cation l '+ and dication 12+. The bathochromic shift for the dication 12+ relative to 1 and to the isoelectronic hydrocarbon anthanthrene (2) can be understood by quantum mechanical calculations {ab initio, AM 1) of model structures. 
  Reference    Z. Naturforsch. 51b, 377—380 (1996); received October 4 1995 
  Published    1996 
  Keywords    Spectroelectrochemistry, MO-Calculations, Xanthenoxanthenes, Radical Cation, Dication 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0377.pdf 
 Identifier    ZNB-1996-51b-0377 
 Volume    51 
63Author    G. Erhard, H. Enesa, A. Nton Rieker, M. Arkus, N. Eum Ayerb, W. Olfgang HillerRequires cookie*
 Title    ,4-Addition of Lithium Organyls to /?ara-Quinols / Structure Determination of 2,6-Di-te/t-butyl-4-hydroxy-4,5-diphenyIcyclohex-2-en-l-one  
 Abstract    Addition of lithium organyls to sterically hindered para-quinols leads to 1,2-or 1,4-adducts. The 1,4-addition prevails, if the 4-substituents in the quinol and the organic group in the lithium organyl are large. Four 1,4-addition products (2-cyclohex-2-en-l-ones) are synthesized and their structures investigated by NMR spectroscopy. The aryl groups at C-4 and C-5 acquire equatorial positions, the alkyl group at C-6 is bisectional. These results are confirmed by X-ray analysis of 2,6-di-terr-butyl-4-hydroxy-4,5-diphenylcyclohex-2-en-1 -one, revealing a twist boat conformation of the cyclohexene ring. 
  Reference    Z. Naturforsch. 51b, 381—387 (1996); received August 11 1995 
  Published    1996 
  Keywords    Crystal Structure, Quinol, 1, 4-Addition, Lithium Organyl, Cyclohex-2-en-l-ones 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0381.pdf 
 Identifier    ZNB-1996-51b-0381 
 Volume    51 
64Author    BernhardG. Ollasa, S. Bernd, Peiser1, H. Artm, Ut Stahp, Jürgen Sieglenb, Joachim StrählebRequires cookie*
 Title    Electrochemistry of Oxygenation Catalysts, Part 6* Electrosynthesis, Structure, Analytical and Electrochemical Properties of Monomeric [Coin(salen)(DMF)2]+ X' Salts (X = PF6, C104)  
 Abstract    Electrochemistry [CoH1(salen)(DMF)2]+ X" salts [X = PF6, C104; salen = bis(salicyliden)ethylendiiminato; DMF = dimethylformamide] have been synthesized by electrochemical and chemical (air) oxidation of Co"(salen). Their monomeric structure with two DMF molecules in the axial positions in both the solid state and DMF solution is shown by X-ray crystal structure analysis, thermal analysis, mass spectroscopy, and 'H and l3C NMR spectroscopy. The electrochemical reduction of the [Coni(salen)(DMF)2]+ cation is investigated by cyclic voltammetry and com­ pared to the oxidation of the neutral CoH(salen). The redox reaction connecting the cobalt(II) and the cobalt(III) species appears to be a quasi-reversible electron transfer. These properties make the [Co1 1 (salen)(DMF)2]+ X-salts starting materials for the analysis of the interaction of basic substrates with cobalt(III) species in the context of the biomimetic oxygenation reactions catalyzed by such complexes. 
  Reference    Z. Naturforsch. 51b, 388—398 (1996); received September 4. 1995 
  Published    1996 
  Keywords    Cobalt Complexes, Oxygenation Catalysts, Crystal Structure, Solution Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0388.pdf 
 Identifier    ZNB-1996-51b-0388 
 Volume    51 
65Author    Eva-M Struckb, Karl Aria Peters0, H. Petersc, Georg Ans, Von SchneringcRequires cookie*
 Title    Verknüpfung koordinativ ungesättigter Kupfer(II)-Monomere via Cyano-versus Tetrazolyl-Donor [1]  
 Abstract    Reaction of a methanolic copper(II) acetate solution with tetrazolyl enol derivatives 2a (HL2) or 2b (HL3) leads to the formation of the corresponding 2D-coordination polymers 4 (^ [CuL^]) and 5 (^ [CuL2]), respectively. Single-crystal X-ray diffraction of the supramolecular species 4 and 5 established unequivocally the structures of the regioisomeric coordination polymers. On the contrary, reactions of 2c (HL4) with methanolic copper(II) acetate solution and 2b (HL3) with methanolic zinc(II) acetate solution yield mononuclear chelate complexes 11 ([CuL2]) and 12 ([ZnL2(MeOH)2]). The structures of 11 and 12 have been established by X-ray structure analysis. 
  Reference    Z. Naturforsch. 51b, 399—408 (1996); eingegangen am 14. August 1995 
  Published    1996 
  Keywords    Tetrazolyl Enols, Coordination Polymers 2D Copper Complexes, Spontaneous Self-Assembly, X-Ray 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0399.pdf 
 Identifier    ZNB-1996-51b-0399 
 Volume    51 
66Author    H. Ans-D, Ietrich Stachel, Jo Sef Schachtner111, Josef Seidel121Requires cookie*
 Title    Reduktion cyclischer Maleinsäurederivate Reduction o f C yclic M aleic Acid Derivatives  
 Abstract    A series of potentially cytotoxic a,/?-unsaturated 7 -hydroxy-butyrolactones, -lactams and -thiolactones has been synthesized via regioselective hydride reduction of the appropriate maleic acid anhydrides, imides and thioanhydrides. By this means a straightforward access to naturally occurring antibiotic narthigenine 2, its hitherto unknown thio-analogue 5b and higher substituted derivatives and analogues of 2 is presented. 
  Reference    Z. Naturforsch. 51b, 409—416 (1996); eingegangen am 28. Juni 1995 
  Published    1996 
  Keywords    Reduction, Narthigenine, Butyrolactones, Butyrolactams, Tetramic Acids 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0409.pdf 
 Identifier    ZNB-1996-51b-0409 
 Volume    51 
67Author    Electrochem Ical, D. Ehalogenation, F. Endosulfane, J. G. Assm Anna, J. Voss3 ', G. A. Diw IdjajabRequires cookie*
 Title    Electroreduction of Organic Compounds, 27 [1]  
 Abstract    Chlorinated Insecticides, Electrochemical Reduction, Endosulfane, Dechlorination, X-Ray (R) Partial dechlorination takes place if Endosulfane is electrolysed in methanol solution at lead cathodes. The products are detected and identified by GC/MS, IR and NMR spectroscopy. The structure of the product 2 is confirmed by an X-ray structural analysis. 
  Reference    Z. Naturforsch. 51b, 417—420 (1996); received September 4 1995 
  Published    1996 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0417.pdf 
 Identifier    ZNB-1996-51b-0417 
 Volume    51 
68Author    H. Möhrle, U. Von Der Lieck-WaldheimRequires cookie*
 Title    Vinamidinium-Salze als Nucleophile Vinamidinium Salts as N ucleophiles  
 Abstract    1,4-diazepinium salts could not be aminomethylated with conventional methods, but the hydrochlorides produced with methyleniminium salts the C-Mannich-compounds. The reactivity of the substrate was mainly controlled by electronic effects of the substituents. Aminomethylation of 1,5-diazapentadienium salts occurred only if the conformations caused no steric hindrance of the ß-C-atom. Methyl substituted 2,3-dihydro-1,4-diazepinium salts reacted with 1,3,5 triazine to pyrimidine anellated derivatives. 
  Reference    Z. Naturforsch. 51b, 421—430 (1996); eingegangen am 4. Juli 1995 
  Published    1996 
  Keywords    Mannich Reaction, Iminium Salts, 1, 3, 5 Triazine, Push-Pull-Systems 2, 3-Dihydro- 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0421.pdf 
 Identifier    ZNB-1996-51b-0421 
 Volume    51 
69Author    Karl Peters3, Eva-M Aria Peters3, G.Erhard Bringmannb, O. La, F. SchuppbRequires cookie*
 Title    l,3-Dimethoxy-677- benzo[b]naphtho[l,2-d]pyran-6-thione, a Thionolactone-Bridged Axially Prostereogenic Biaryl  
 Abstract    The title compound was prepared from the cor­ responding " ordinary" oxolactone bridged biaryl using Lawesson's reagent. It crystallizes from di-chloromethane / petroleum ether in the mono­ clinic system, space group P2xla; a = 1115.7(2), 
  Reference    Z. Naturforsch. 51b, 431—432 (1996); received September 9 1995 
  Published    1996 
  Keywords    Crystal Structure, Stereochemistry, Biaryl Coupling 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0431_n.pdf 
 Identifier    ZNB-1996-51b-0431_n 
 Volume    51 
70Author    Hans-Joachim Mai, Bernhard Neumüller, Kurt DehnickeRequires cookie*
 Title    [M n (/ t-B u )(N PE t3) ] 4, an Organomanganese Com pound with Heterocubane Structure  
 Abstract    O rganom anganese Com pound, Synthesis, Crystal Structure [M n (« -B u)(N P E t 3) ] 4 has been prepared by the reaction o f [M n B r(N P E t3) ] 4 with «-butyllithium in b oilin g pentane. The pyrophoric compound form s red, moisture sensitive crystals, which were characterized by IR spectroscopy and by a crystal structure determ ination (tetragonal, space group I4j/a, Z = 4, structure solution with 699 observed unique reflections, R = 0.054. Lattice dimensions 
  Reference    Z. Naturforsch. 51b, 433—436 (1996); eingegangen am 19. Septem ber 1995 
  Published    1996 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0433_n.pdf 
 Identifier    ZNB-1996-51b-0433_n 
 Volume    51 
71Author    Requires cookie*
 Title      
  Reference    Z. Naturforsch. 51b, 437 (1996) 
  Published    1996 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0437_n.pdf 
 Identifier    ZNB-1996-51b-0437_n 
 Volume    51 
72Author    Danita De, W. Aal, M. Anfred Zabel, Klaus-JürgenRequires cookie*
 Title    The Crystal Structure o f /?-CsI04, the Room-Temperature Modification o f Cesium Periodate  
 Abstract    The crystal structure of /?-CsI04, the room-tem-perature modification o f cesium periodate, was determined as orthorhombic, space group Pnma, with a = 5.8644(5), b = 6.0326(4), c = 14.379(1) A and Z = 4. The structure was refined to = 0.0309, wR2 = 0.0701 for 425 absorption-corrected reflections. /?-CsI04 is isostructural with yS-CsRe04. The structure comprises isolated I 0 4 tetrahedra, linked together by Cs ions. The average 1-0 dis­ tance was found to be 1.747 A . 
  Reference    Z. Naturforsch. 51b, 441—443 (1996); received July 17 1995 
  Published    1996 
  Keywords    Cesium Periodate, Room-Temperature Modifica­ tion, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0441_n.pdf 
 Identifier    ZNB-1996-51b-0441_n 
 Volume    51 
73Author    Danita De, W. Aal, *. Klaus-Jürgen, R. AnRequires cookie*
 Title    Structure Refinem ent o f Potassium Periodate at 297 and 150 K  
 Abstract    The scheelitetype structure of potassium perio­ date, K I 0 4, has been confirmed and refined from single-crystal X-ray data at two temperatures. The compound crystallizes tetragonally, space group 14,/a, with a = 5.726(1), c = 12.607(4) Ä at 297(1) K, and a = 5.704(3), c = 12.478(8) A at 150(1) K, respectively. Except for a significant decrease in the anisotropic displacement factors, the changes in the structural parameters at low temperature are rather small. 
  Reference    Z. Naturforsch. 51b, 444—446 (1996); eingegangen am 4. August 1995 
  Published    1996 
  Keywords    Potassium Periodate, Structure Refinement, Scheelite-Type Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0444_n.pdf 
 Identifier    ZNB-1996-51b-0444_n 
 Volume    51 
74Author    O. Sedello, Hk Müller-BuschbaumRequires cookie*
 Title    On the Crystal Structure o f (C u ,M n )3 66M o30 12  
 Abstract    Single crystals o f (Cu,M n)3 66M o 30 12 have been prepared in sealed copper tubes. X-ray investiga­ tions lead to orthorhombic symmetry, space group Dih-Pnm a, a = 5.1541(9), b = 10.788(2), c = 18.114(3)) Ä , Z = 4. (Cu,M n)366M o 30 12 is iso­ typic to NaCo2 31M o 30 12 and (C u,C o)3 75M o 30 12 with split positions for two o f the metals. 
  Reference    Z. Naturforsch. 51b, 447—449 (1996); eingegangen am 31. August 1995 
  Published    1996 
  Keywords    Copper, Manganese, Molybdenum Oxide, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0447_n.pdf 
 Identifier    ZNB-1996-51b-0447_n 
 Volume    51 
75Author    O. Sedello, Hk Müller-BuschbaumRequires cookie*
 Title    On the Crystal Structure of (Cu, M n )U M o 30 12  
 Abstract    Single crystals of (C u,M n)U M o30 12 have been prepared in sealed copper tubes. X-ray investiga­ tions lead to hexagonal symmetry, space group C|h-P63/m, a = 9.7895 (13), c = 6.202(1) A , z = 2. (C u ,M n)U M o30 12 is isotypic to CdThM o30 12. Calculations of the Coulomb terms o f lattice energy with respect to different oxidation states o f copper, molybdenum and uranium and the pre­ viously described pair of isotypic compounds of CdThM o30 12 to Na2ThRe60 24 are discussed. 
  Reference    Z. Naturforsch. 51b, 450—452 (1996); eingegangen am 5. September 1995 
  Published    1996 
  Keywords    Copper, Manganese, Uranium Molybdenum Oxide, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0450_n.pdf 
 Identifier    ZNB-1996-51b-0450_n 
 Volume    51 
76Author    Hk Müller-Buschbaum, H. ÜnsalRequires cookie*
 Title    On Ba6Pr2C o4O i5 and Ba5SrPr2C o40 15  
 Abstract    Ba6Pr2Co40 15 (I) and Ba5SrPr2Co40 15 (I I) have been prepared by high temperature C 0 2-L A S E R techniques. Both compounds crystallize with hexagonal symmetry, space group C£v-P63mc, (I): a = 11.814(1), c = 7.100(2) A ; (II): a = 11.646(1), c = 6.8602 A , Z = 2. It is remarkable that the strongly reducing Pr3+ can coexist with the more oxidizing Co3+. 
  Reference    Z. Naturforsch. 51b, 453—455 (1996); eingegangen am 2. Oktober 1995 
  Published    1996 
  Keywords    Barium, Cobalt, Praseodym, Oxygen, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0453_n.pdf 
 Identifier    ZNB-1996-51b-0453_n 
 Volume    51 
77Author    2s4-M Gin2s4, H. Haeuseler, W. CordesRequires cookie*
 Title    Subsolidus Phasenbeziehungen in den Systemen M g G a 2S4-M gC r2S4  
 Abstract    Neue Verbindungen mit Spinell-, Olivin-und ZnIn2S4(IIIa)-Struktur Subsolidus Phase Relationships in the Systems M g G a 2S4-M gC r2S4 and M g G a 2S4-M gIn 2S4 N e w Compounds with Spinei-, O livine-and Zn In 2S4(IIIa)-T y p e Structure The title systems have been investigated on samples quenched at 700, 800 and 1000 °C. Five new compounds have been obtained and characterized by X-ray powder diffraction: Spinel type M gG a02C rl 8S4, two compounds crystallizing in the olivine structure, MgGaCrS4 and M gGaInS4, and two layered materials, M gGaj 5Cra5S4 and M gG aj 5In0.5S4. Lattice para­ meters and phase widths o f the compounds are given. 
  Reference    Z. Naturforsch. 51b, 457—460 (1996); eingegangen am 6. Novem ber 1995 
  Published    1996 
  Keywords    Chalcogenides, Olivine Type Structure, Spinei, Layered Structures 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0457.pdf 
 Identifier    ZNB-1996-51b-0457 
 Volume    51 
78Author    =. Eu, Hk Müller-Buschbaum, L. W. LffRequires cookie*
 Title    Weitere Verbindungen mit isolierten quadratischen P d 0 4-Polygonen: Compounds Containing Isolated Square Planar P d 0 4 Polygons: B aPd Ln 20 5 (L  
 Abstract    New compounds o f the composition BaPdLn2O s (Ln = Eu, Gd, Dy, H o) have been prepa­ red by crystallization from flux. They crystallize isotypic to BaPtLn7Ö 5, space group D-4h-P4/ mbm. Eu: a = 6.6359(6), c = 5.885(3) A ; Gd: a = 6.608(3), c = 5.873(3) A ; Dy: a = 6.5431(7), c = 5.8574(8) A ; Ho: a = 6.522(4), c = 5.855(5) A , Z = 2. The crystal structure is characterized by isolated planar P d 0 4 polygons incorporated into a framework o f edge-and corner-sharing doubly capped BaO s cubes and edge-and face-sharing L n 0 6 prisms. 
  Reference    Z. Naturforsch. 51b, 461—464 (1996); eingegangen am 16. Oktober 1995 
  Published    1996 
  Keywords    Barium, Palladium, Rare Earth Oxide, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0461.pdf 
 Identifier    ZNB-1996-51b-0461 
 Volume    51 
79Author    Hk Sedello, Müller-BuschbaumRequires cookie*
 Title     
 Abstract    Single crystals of BaCuTe03T e 0 4 have been prepared by crystallisation from melts. X-ray investigations lead to orthorhombic symmetry, space group C2v-Ama2, a = 5.4869(8), b = 15.412(1), c = 7.2066(4) A , Z = 4. This compound represents a new structure type, containing B aO 10, C u 0 5, T e 0 6 and T e 0 4 polyhedra. The lone pair (E) of TeIV completes the TeIV0 4 polyhedron to a trigonal T e 0 4E bipyramid. The Te to E distance is estimated by calculations o f the Coulomb terms of lattice energy to 1.43 A . 
  Reference    Z. Naturforsch. 51b, 465—468 (1996); eingegangen am 31. August 1995 
  Published    1996 
  Keywords    Barium, Copper, Tellurium, Oxide, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0465.pdf 
 Identifier    ZNB-1996-51b-0465 
 Volume    51 
80Author    Z., D. Frerichs, Hk Müller-BuschbaumRequires cookie*
 Title    Synthesis and Crystal Chemistry o f the /3-Form o f a M ixed Zinc Orthoarsenate  
 Abstract    Single crystals o f Zn228M g0 72(A s 0 4) 2 have been prepared by C 0 2 L A S E R techniques. The compound crystallizes with monoclinic symmetry space group C 2h-P2j/n and the lattice parameters a = 5.292(2), b = 8.450(3), c = 7.737(3) Ä , ß = 96.33(3)°, Z = 2. Zn2 28M g072(A s O 4) 2 is isotypic to /3-Zn3(A s 0 4)2. The formation of the /3-Zn3(A s 0 4) 2 struc­ ture instead o f other possible orthoarsenates is discussed. 
  Reference    Z. Naturforsch. 51b, 469—472 (1996); eingegangen am 2. Oktober 1995 
  Published    1996 
  Keywords    Zinc, Magnesium, Arsenic, Oxide, Crystal Structure 
  Similar Items    Find
 DEBUG INFO      
 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0469.pdf 
 Identifier    ZNB-1996-51b-0469 
 Volume    51 
Prev
1
2
3
4
5
...
Next