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Facet   Publication Year 1995  [X]
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1995[X]
101Author    Yali Wang, Hong Zhang, Wolfgang VoelterRequires cookie*
 Title    Block Synthesis o f Oligosaccharides under M ild Conditions  
 Abstract    Oligosaccharides, Phenyl 1-Thioglycoside Sulfoxides Details on a synthesis of the trisaccharide a-D -G lc(l-^6)-/?-D -G lc(l —»6)-D -G lc are re­ ported. The O-glycosidic linkages were constructed using the sulfoxide glycosylation reaction. This approach proves to be a rapid glycosylation method leading to high yield and good se­ lectivity. 
  Reference    Z. Naturforsch. 50b, 661—666 (1995); received November 22 1994 
  Published    1995 
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 Identifier    ZNB-1995-50b-0661 
 Volume    50 
102Author    Konstantina Kehagia, Alexander Dömling, Ivar Ugi, Wolfgang Hiller, Jürgen RiedeRequires cookie*
 Title    N e w Synthesis and Structure Determination o f 13-Aza-4,-trioxatricyclo[7,3>l?05'13]tridecane  
 Abstract    A new 13-Aza-4,4,8,8,12,12-hexamethyl-2,6,10-trioxatricyclo[7,3,l,05'13]tridecane synthesis and the crystal structure are reported. It crystallizes in the monoclinic space group P2Jn with a = 1201.9(1) pm, b = 1436.6(1) pm, c = 1726.2(2) pm, ß = 90.74(1)° and Z = 8. 
  Reference    Z. Naturforsch. 50b, 667—670 (1995); received August 2 1994 
  Published    1995 
  Keywords    Asinger Condensation, C3-Symmetric Heterocycle, 5, 6-Dihydro-2//-l, 3-oxazine, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0667.pdf 
 Identifier    ZNB-1995-50b-0667 
 Volume    50 
103Author    Ernst Bayer, Martin Maier, Konrad Bleicher, Hans-Joachim GausRequires cookie*
 Title    Synthesis o f 3 '-P E G -M o d ifie d Oligonucleotides on P S -P E G Tentacle Polymers  
 Abstract    Tentacle Polymers of PS-PEG, Oligonucleotides, Solid Phase, Capillary Electrophoresis PS-PEG tentacle polymers are modified for the synthesis of oligonucleotides covalently bound to polyethylene glycol (P E G) at their 3'-position by the solid phase method without additional steps. The average stepwise coupling rates and overall yields are in the range of standard oligonucleotide synthesis. Oligonucleotides and phosphorothioates up to 20 nucleo­ tides, modified with hexaethylene glycol (H E G), PE G 40o and P E G 150o, are synthesized in this manner. The products are characterized by capillary electrophoresis and electrospray mass spectrometry (ES-M S). These new methods are very efficient for purity control as it is required for potential antisense drugs. 
  Reference    Z. Naturforsch. 50b, 671—676 (1995); received October 12 1994 
  Published    1995 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0671.pdf 
 Identifier    ZNB-1995-50b-0671 
 Volume    50 
104Author    Ulrich Weber, KlausTh WannerRequires cookie*
 Title    durch direkte Kondensationsreaktion von 3,4-Dihydro-/?-carbolin mit «-H ydroxy-y-butyrolactonen  
 Abstract    One-Step Synthesis of O xazolo[3',2': l,2]pyrido[3,4-b]indoles by Condensation of 3,4-Dihydro-/3-carboline with a-Hydroxy-y-butyrolactones 3,4-Dihydro-/?-carboline, a-Hydroxy-y-butyrolactone, O xazolo[3',2': l,2]pyrido[3,4-b]indole 
  Reference    Z. Naturforsch. 50b, 677—680 (1995); eingegangen am 24. Oktober 1994 
  Published    1995 
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 Identifier    ZNB-1995-50b-0677 
 Volume    50 
105Author    Ch LangRequires cookie*
 Title      
 Abstract    Single crystals of LiBa2Cu30 6 have been pre­ pared by recrystallization from melts in a stream of dry Argon as well as by spontaneous CO 2-LASER heating. It crystallizes with orthorhom bic symmetry, space group -Fmmm, a = 8,219(2), b = 11,520 (2), c = 14,284(3) A, Z = 8. The crystal structure is isotypic to NaBa2Cu30 6. 
  Reference    Z. Naturforsch. 50b, 681—683 (1995); eingegangen am 19. September 1994 
  Published    1995 
  Keywords    Lithium, Barium, Copper, Oxide 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0681_n.pdf 
 Identifier    ZNB-1995-50b-0681_n 
 Volume    50 
106Author    JörgJ. Schneider, Ullrich SpechtRequires cookie*
 Title    Preparation o f Dimeric [(j/5-/B u3Cp)CoBr]2 and Convenient Synthesis o f the Homodinuclear Cobalt Complex [(75-rBu3Cp)Co]2H 3 therefrom  
 Abstract    Homonuclear Cobalt Hydride Cluster The title compound [(?75-rBu3Cp)CoBr]2 1 is prepared in a one pot reaction starting from 1,2,4-fBu3-cyclopentadiene followed by metallation and by reaction of the resulting ?Bu3C p"K+ anion salt with anhydrous CoBr2 in THF. 1 was isolated from this reaction in 78% yield as black crystals. 1 reacts with LiA lH 4 in THF at 0 °C. Subsequent alcoholysis of the crude reaction mixture with ethanol at -7 8 °C gives the novel trihydride clus­ ter [(?75-rBu3Cp)Co]2H 3 2 in 58% isolated yield as 
  Reference    Z. Naturforsch. 50b, 684—686 (1995); received September 13 1994 
  Published    1995 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0684_n.pdf 
 Identifier    ZNB-1995-50b-0684_n 
 Volume    50 
107Author    NewN., Si, Lothar Marcus, Uwe Klingebiel, Mathias Noltemeyer+, Chme2Requires cookie*
 Title    Neue N,Si,0,C-Heteraphane - Synthese eines 16-gliedrigen Makrocyclus of a 16-Membered Macrocycle NoF H-N Me2H C -S i Me2HC  
 Abstract    Bis(fluorodiisopropylsiiyi)amine [(Me2H C)2SiF]2NH (1) reacts with the disodium salt of catechole or the disodium salt of resorcinol in a molar ratio 1:1 to give the seven-membered heteraphane [HN(Me2H C)2SiO]2C6H4 (2) resp. the 16-membered heteraphane [HN(Me2H C)2SiOC6H4O Si(CHM e2)2]2 (3). The chain-like compound [(Me2H C)2SiFNHSi(CHMe2)20 ] 2C6H4 (4) is obtained by the reaction of 1 with disodium resor-cinolate. Ergebnisse und Diskussion Läßt man Bis(fluordiisopropylsilyl)amin (1) im Molverhältnis 1; 1 mit dinatriiertem Brenzcatechin reagieren, entsteht das neuartige, siebengliedrige H eteraphan 2. Im Gegensatz zum Brenzcatechin sind bei Resorcin die Sauerstoffatome in 1,3-Stel-lung am A rom aten gebunden. Dies bewirkt, daß dinatriiertes Resorcin aus sterischen Gründen mit 1 nicht analog der Bildung von 2 zu einem acht-gliedrigen, sondern zum bislang unbekannten 16-gliedrigen H eteraphan 3 reagiert. 
  Reference    Z. Naturforsch. 50b, 687—690 (1995); eingegangen am 13. September 1994 
  Published    1995 
  Keywords    0, C-Heteraphanes -Synthesis Silicon, Macrocycle, Heteraphane, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0687_n.pdf 
 Identifier    ZNB-1995-50b-0687_n 
 Volume    50 
108Author    Joseph Grobe, Duc Le Van, Hinrich Wiese, Bernt Krebs, Mechtild Läge, LioubovS. KobrinaRequires cookie*
 Title    Novel Fluorine-Containing Phosphorus Ylids from 6-Phenyl-3-pentafluorophenoxy- tetrafluorocyclohexa-2,4-dien-l-one and Triphenylphosphane  
 Abstract    The reaction of 6-phenyl-3-pentafluorophenoxy-tetrafluorocyclohexa-2,4-dien-l-one (1) with one equivalent of triphenylphosphane leads to the spectroscopically detectable 5-phenyl-4-penta-fluorophenoxy-3,3,6,6-tetrafluoro-2-triphenyl-phosphoranylidene-4-cyclohexen-l-one (2), which 
  Reference    Z. Naturforsch. 50b, 691—6 (1995); eingegangen am 7. September 1994 
  Published    1995 
  Keywords    Cyclohexadienone, Triphenylphosphane, Phosphorus Ylid 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0691_n.pdf 
 Identifier    ZNB-1995-50b-0691_n 
 Volume    50 
109Author    P. C. Srivastava3, H.-G Schmidtb, H. W. RoeskybRequires cookie*
 Title    The Crystal Structure of [Et4N ]22+[TeI6]2-, a Tetraalkyl Ammonium Salt Containing a Discrete Octahedral [Tel6]2~ Anion  
 Abstract    Hexacoordinate Tellurium(IV), Tellurium(IV)-Iodine Com pound, X-Ray The structure of [Et4N]22+[TeI6]2~, the first tetraalkyl ammonium salt to contain the almost regular octahedron of a discrete [TeI6Jz_ anion, has been determ ined by single crystal X-ray dif­ fraction studies. It crystallizes in the monoclinic space group C2/c with a = 18.757(3), b = 11.578(2), c = 15.447(2) A, ß = 109.380(10)°. The [Tel6]2~ anion has T e -I bond distances in the range of 2.845 to 2.948 Ä and I -T e -I bond angles in the range of 89(1) to 90.1(1)°. 
  Reference    Z. Naturforsch. 50b, 695—696 (1995); received Septem ber 1 1994 
  Published    1995 
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 Identifier    ZNB-1995-50b-0695_n 
 Volume    50 
110Author    MusaH Abu Zarga3, TalebH. Al-Telb, Wolfgang Voelterb, *. ObnRequires cookie*
 Title    Synthesis of 3-Amino-3-deoxy Sugars through Intramolecular Carbamate Cyclizations on a Neighbouring Oxirane Ring  
 Abstract    , 1994 3-Amino-3-deoxy Sugars, Triflate Sugars, Carbamates 3-Amino-3-deoxy sugars [1] are essential sub­ structures of a wide variety of biologically active natural products exemplified in aminocyclitols, [2] macrolides [3] or anthracyclin antibiotics [4], With this respect, the transformations of common and readily available carbohydrates are of special interest. In this communication we want to line out a short route for the incorporation of a vicinal cis hydroxyl-amino function in the pyranose moiety. Starting from the ds-oriented epoxy pyranose triflates 1 and 2 which we have explored as chiral tem plates for the synthesis of amino sugars, [5 a] cyclopropanated pyranoses [5 b], y-butyrolactones [5 c], dihydrofurans, [5d] or polyfunctionalized tetrahydrofurans [5e], SN2 substitution with IN N aO H /D M F yielded the rra/is-oriented hydroxy-epoxy pentoses 3 and 4 [6] respectively. Sub­ sequent reaction of 3 and 4 with benzoylisocyanate in C H 2C12 afforded 5 and 6 in quantitative yields. The carbam ate pyranoses 5 and 6 can be trans­ formed to the oxazolidinones 7 and 8 by reflux with NaH in THF. As many of the naturally oc-curing 3-amino sugars are N-methylated. The oxa­ zolidinones 7 and 8 were reacted with NaH and M el in THF to produce 9 and 10 quantitatively, followed by base hydrolysis to deliver 11 and 12, respectively (Schemes 1 and 2). nh 7 Tf0 NHMe 11 Meo\ °" \ 1/1 1 ,?------C -/ s ' — NMe 
  Reference    Z. Naturforsch. 50b, 697—698 (1995); received July 14 
  Published    1995 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0697_n.pdf 
 Identifier    ZNB-1995-50b-0697_n 
 Volume    50 
111Author    NorbertW. Mitzel+, Jürgen Riede, Klaus Angermaier, H. Ubert SchmidbaurRequires cookie*
 Title    Solid State Structure of N,N-Dibenzylhydroxylamine  
 Abstract    The solid-state structure of N,N-dibenzyl-hydroxylamine (1) has been determ ined by single crystal X-ray diffraction. The compound crys­ tallizes in the monoclinic space group P 2 \ln with four formula units in the unit cell. N,N-dibenzyl-hydroxylamine dimerizes to give N20 2H 2 six-membered rings as a result of the formation of two hydrogen bonds O -H —N in the solid state. 
  Reference    Z. Naturforsch. 50b, 699—701 (1995); received O ctober 31 1994 
  Published    1995 
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 Identifier    ZNB-1995-50b-0699_n 
 Volume    50 
112Author    S. Münchau, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kristallchemie eines Silber-Cadmium-Oxovanadats: AgCdV04 On the Crystal Chemistry of a Silver Cadmium Oxovanadate: A gC dV 04  
 Abstract    Single crystals of A gC dV 04 have been prepared in closed silver tubes using V20 5 as a flux. The light-orange crystals sho\v orthorhom bic symmetry, space group D2h-Pnm a, a = 9.786(2), b = 6.994(1), c = 5.439(1) A, Z = 4. The hitherto unknown A gC dV 04 is related to the Olivine structure but isotypic to Ag2C r 0 4 and NaCd4(V 0 4)3 respectively. The differences in crystal chemistry between the Olivine type, NaCd4(V 0 4)3 and A gC dV 04 are discussed. 
  Reference    Z. Naturforsch. 50b, 703—706 (1995); eingegangen am 10. O ktober 1994 
  Published    1995 
  Keywords    Silver, Cadmium, Vanadium, Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0703.pdf 
 Identifier    ZNB-1995-50b-0703 
 Volume    50 
113Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    On the Oxocuprate (C u,C o)375Mo30 12  
 Abstract    Single crystals of (C u,C o)3 7?Mo30 12 have been prepared by recrystallization from melts and investigated by X-ray diffractometer techniques. TTie compound crystallizes with ortho-rhombic symmetry, space group D'2 6 h-P n m a , a = 5.092(1), b = 10.624(3), c = 17.804(4) A, Z = 4 and is isotypic to NaCo2.3iMo30 12. The crystal structure is discussed and it is shown, that the trigonal prismatically coordinated copper positions are occupied in a different m an­ ner. One of the alternate sites is beside the centre of the prisms, and the other one is shifted towards one of the faces of the rectangular prism. This detail may be interpreted by assigning the valance states C u1 and Cu11. The M 0 6 octahedra are occupied statistically by copper and cobalt. 
  Reference    Z. Naturforsch. 50b, 707—711 (1995); eingegangen am 10. O ktober 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Cobalt, Molybdenum, Oxide 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0707.pdf 
 Identifier    ZNB-1995-50b-0707 
 Volume    50 
114Author    E. Peters, Hk Müller-BuschbaumRequires cookie*
 Title    Hochtemperatursynthese und Kristallchemie der Oxotantalate Cr 0^6 1 ^ 2 ,0 9 5 ^ 6 un^ FeTa20 6 High Tem perature Synthesis and Crystal Chemistry of the O xotantalates Cr o+ 76]Ta2.095^6 and FeTa20 6  
 Abstract    Black single crystals of Cr<)761Ta2 ()95 0 6 have been prepared by C 0 2-LASER techniques. This phase crystallizes with monoclinic symmetry, space group C'2h-P 2 1/c, a = 4.748(1). b = 4.750(2), c = 10.405(3) Ä, ß = 117.152(13)°, Z = 2. The crystal structure is closely related to the trirutile type, although the metal positions are partly statistically occupied by Cr2+ and Ta5+ or underoccupied by Ta3+, respectively. FeTa20 6, prepared by the same m ethod does neither show any statistic occupation nor deviations from the trirutile structure, space group D 1 44 h-P 4 2/mnm, a = 4.7595(5) A, c = 9.201(2)A, Z 
  Reference    Z. Naturforsch. 50b, 712—716 (1995) 
  Published    1995 
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 Identifier    ZNB-1995-50b-0712 
 Volume    50 
115Author    H. Szillat, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Darstellung und Kristallstruktur eines neuen Kupfer-Antimon-Oxomolybdats: CuSbMo20 8 On the Synthesis and Crystal Structure of a New Copper Antimony Oxomolybdate: CuSbMo20 8  
 Abstract    Single crystals of the hitherto unknown com pound CuSbMo2O s were prepared by recrys­ tallization from melts in closed copper tubes and investigated by X-ray diffractometer techni­ que. CuSbMo^Os crystallizes in a new structure type with monoclinic symmetry, space group q ? h-I 1 2 /a l, a = 5.554(2), b = 4.916(1), c = 21.519(4) Ä, ß = 93.42(3)°, Z = 4. The crystal structure shows Sb111 in a one-sided coordination by four oxygen. Molybdenum shows the rare octahedral coordination by oxygen. M o 0 6 and C u 0 6 octahedra form triple layers stacked and connected by Sb ions along [001], 
  Reference    Z. Naturforsch. 50b, 717—720 (1995); eingegangen am 12. O ktober 1994 
  Published    1995 
  Keywords    Crystal Structure, Copper, Antimony, Molybdenum, Oxide 
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 Identifier    ZNB-1995-50b-0717 
 Volume    50 
116Author    M. Schnock+, P. BöttcherRequires cookie*
 Title    Darstellung und Kristallstruktur von [Cs4(Dibenzo-18-Krone-6)3](S6)2-2CH3CN Synthesis and Crystal Structure of [Cs4(Dibenzo-18-Krone-6)3](S6)2 * 2 CH3CN  
 Abstract    [Cs4(dibenzo-18-crown-6)3](S6)2-2CH3CN has been prepared from dibenzo-18-crown-6, Cs2C 0 3 and suifur in acetonitrile saturated with H 2S. The title compound crystallizes in space group P I (lattice dimensions: a = 10,507(7)Ä, b = 11,504(6) A, c = 17,792(9) A, a = 97,86(4)°, ß = 105,86(4)°, y = 101,48(5)°) with one formula unit. The crystallographic units are built of stacks of three crown ether molecules and two hexasulfide chains with the cations located between them. The conformation of the hexasulfide chains is all-cis. 
  Reference    Z. Naturforsch. 50b, 721—724 (1995); eingegangen am 15. Septem ber 1994 
  Published    1995 
  Keywords    Cesium, Crown Ether, Polysulfide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0721.pdf 
 Identifier    ZNB-1995-50b-0721 
 Volume    50 
117Author    W. Cordes, S. Reil, H. HaeuselerRequires cookie*
 Title    Gaj.9 3 V0 .9 7 S4 > eine neue gemischtvalente Verbindung mit «-FeGa2 S4-Struktur Ga! 93V 0 97S4, a New Mixed Valent Compound with a-FeG a2S4 Structure  
 Abstract    Mixed Valence Compound G a!.93V0.9-7S4, X-Ray The mixed valence compound G a1.93V0.97S4 has been prepared and characterized by X-ray powder methods. The compound crystallizes in an a-F eG a2S4 structure. The lattice parameters of the hexagonal cell are a = 363.6 and c = 1207.1 pm. The structure has been refined by Rietveld methods. 
  Reference    Z. Naturforsch. 50b, 725—728 (1995); eingegangen am 27. O ktober 1994 
  Published    1995 
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 Identifier    ZNB-1995-50b-0725 
 Volume    50 
118Author    Horst Heidel, G. Ottfried Huttner, Laszlo ZsolnaiRequires cookie*
 Title    Synthesis of a New Optically Active Triphosphine with a Neopentane Backbone  
 Abstract    Tripod Ligand, Optically Active Triphosphine, N eopentane Compound, Chiral Malonic Ester The resolution of the racemate (BzlOCH2)(M e)C (C O O H)(C O O E t) (±)1 is the entry point 
  Reference    Z. Naturforsch. 50b, 729—734 (1995); received September 9 
  Published    1995 
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 Identifier    ZNB-1995-50b-0729 
 Volume    50 
119Author    HansJoachim Breunig, KlausHeinz Ebert, ReinholdErnst Schulz, Markus Wieber, Ingbert SauerRequires cookie*
 Title    Tetramesityldibismutan, Bis(dimesitylbismut)-und Bis(dimethylbismut)chalkogenide Tetramesityldibismuthane, Bis(dimesitylbismuth)-and Bis(dimethylbismuth)chalcogenides  
 Abstract    Tetramesityldibismuthane, Bis(diorganylbismuth)chalcogenides, l,4-Bis(dimethylbismuthoxo)benzene Reduction of Mes2BiBr with Na in liquid NH3 or with Cp2Co in TH F or C6D6 gives Mes4Bi2 (1) as a red solid that reversibly becomes pink on cooling with liquid nitrogen. 
  Reference    Z. Naturforsch. 50b, 735—744 (1995); eingegangen am 7. November 1994 
  Published    1995 
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 Identifier    ZNB-1995-50b-0735 
 Volume    50 
120Author    Abdel-Fattah ShihadaRequires cookie*
 Title    Synthesis and Vibrational and Mass Spectra of (w-Bu)2S n (0 2PM e2)2, (w-Bu)2S n (0 2PM ePh)2 and (w-Bu)2S n (0 2PPh2)2  
  Reference    Z. Naturforsch. 50b, 745 (1995) 
  Published    1995 
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 TEI-XML for    default:Reihe_B/50/ZNB-1995-50b-0745.pdf 
 Identifier    ZNB-1995-50b-0745 
 Volume    50 
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