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  • 1980-1984  (13)
  • 1915-1919
  • 1905-1909
  • 1870-1879
  • 1860-1869
  • 1984  (13)
  • Inorganic Chemistry  (7)
  • Organic Chemistry  (6)
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  • 1980-1984  (13)
  • 1915-1919
  • 1905-1909
  • 1870-1879
  • 1860-1869
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Photoreaction of (RS,SR)-3-Phenyl-6-hepten-2-ol. Benzene-Olefin Cycloadditions as a Synthetic Route to [5.5.5.5] Fenestranes. Part IIIFor part II of the series ‘Planarization of Tetracoordinate Carbon Atom’, see [1b]. (1984)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 67 (1984), S. 1930-1941 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Irradiation of (RS,SR)-3-Phenyl-6-hepten-2-ol (3n) gave the photoproducts 6n-10n. Some reactions of 6n and 8n are reported. The regio- and diastereoselectivity observed in the photoreaction of substituted 5-phenylpentenes is discussed with respect to conformational preferences of the compounds to be irradiated.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19840670731
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  • 2
    Electronic Resource
    Electronic Resource
    Übergangsmetallkomplexe instabiler Ylide, II1). Koordinationschemische Stabilisierung von phosphino- und arsinomethylsubstituierten Phosphonium- bzw. Arsoniummethyliden an Tetracarbonylchrom (1984)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 117 (1984), S. 732-742 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Transition Metal Complexes of Instable Ylides, II1). Stabilization of Phosphino- and Arsinomethyl-substituted Phosphonium- and Arsonium Ylides by Coordination to TetracarbonylchromiumThe sulfur ylide complexes (CO)5Cr[CH2S(O)Me2] (1) and (CO)4Cr[CH2S(O)Me2]2 (7) react with symmetrically substituted ditertiary phosphanes or arsanes such as 5 to yield five-membered metallacycles (6), in which the ylides CH2 = ER21 - ER21 - CR22 - ER21 (E = P, As) are incorporated as chelate ligands. The free ylidic ligands are not stable. The structures of 6 are elucidated by means of IR, 1H and 31P. NMR spectroscopy as well as by an X-ray structure analysis of 6f.
    Notes: Die Schwefelylidkomplexe (CO)5Cr[CH2S(O)Me2] (1) und (CO)4Cr[CH2S(O)Me2]2 (7) reagieren mit den symmetrischen ditertiären Phosphanen und Arsanen 5 zu den fünfgliedrigen Metallacylen 6, welche die im freien Zustand nicht beständigen Ylide H2C = ER21 - CR22 - ER21 (E = P, As) als Chelatliganden tragen. Die Strukturen von 6 werden durch IR-, 1H- und 31P-NMR-Spektren sowie durch die Röntgenstrukturanalyse des Arsenylidkomplexes 6f ermittelt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19841170226
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  • 3
    Electronic Resource
    Electronic Resource
    Prostaglandine und ProstaglandinvorstufenXIII, Mitteilung. XII. Mitteilung siehe [1]. Untersuchungen zur Synthese von 8-MethylprostansäurederivatenTeilergebnisse dieser Untersuchungen wurden in der Dissertation von H.-P. Welzel [2] beschrieben sowie auf dem Symposium “Gewinnung und biologische” Wirksamkeit potentieller Arzneimittel (13.-15. 11. 1978, Magdeburg) vorgestellt [3]. (1984)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 326 (1984), S. 667-675 
    Details
    ISSN: 0021-8383
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Prostaglandins and Prostaglandin Intermediates. Synthetic Approach to 8-Methyl Prostanoic Acid DerivativesStarting from the chiral key-product 1 the 8-methyl prostanoic acid derivative 13 was prepared within 10 steps. Construction of the α-side chain involves DIBAH-reduction of the lacton moiety of 1 followed by Wittig-olefination with a C5-ylide. C1-Homologation of the oxo group of 1 via cyanhydrin synthesis and Wittig-olefination with a C7-ylide are important steps to form the ß-side chain of compound 13.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19843260421
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesen von (+)-Oudemansin und (+)-Epioudemansin aus enantiomerenreinen Vorstufen; absolute Konfiguration des natürlichen (-)-Oudemansins (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 791-801 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of (+)-Oudemansin and (+)-Epioudemansin Starting from Enantiomerically Pure Precursors; Absolute configuration of the Naturally Occurring (-)OudemansinThe syntheses of the four optically pure methyl (E)-3-hydroxy-2-methyl-5-phenyl-4-pentenoates (+)- and (-)-5 as well as (+)- and (-)-6 were achieved by consecutive methylation and protonation of enolates, starting from (+)- and (-)-4. The esters (+)-6 and (-)-5 are used as starting materials to synthesize (+)-oudemansin [(+)-3] and (+)-epioudemansin [(+)-9].
    Notes: Die Darstellung der vier optisch reinen (E)-3-hydroxy-2-methyl-5-phenyl-4-pentensäure-methylester (+)- und (-)-6 gelingt durch aufeinanderfolgende Methylierung und Protonierung von Esterenolaten, ausgehend von (+)- und (-)-4. Die Ester (+)-6 und (-)-5 werden für Synthesen von (+)-Oudemansin [(+)-3] und (+)-Epioudemansin [(+)=9] eingesetzt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840415
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  • 5
    Electronic Resource
    Electronic Resource
    1,6-Anhydrofuranosen, XIV Selektive Monotosylierung der 1,6-Anhydro-β-D-mannofuranose (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 1591-1596 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: 1,6-Anhydrofuranoses, XIV. - Selective Monotosylation of 1,6-Anhydro-β-D-mannofuranoseMonotosylation of 1,6-anhydro-β-D-mannofuranose (1) with p-toluenesulfonyl chloride in pyridine gives the 5-O-tosylate 2a in high yield (79%). As by-products of the reaction small amounts of the 3-O-monotosylate 3a (0.4%) as well as the 2,5- and 3,5-di-O-tosylates 4a (3.5%) and 5a (1.2%), respectively, are isolated. Product identification was achieved by 1H NMR spectroscopy in comparison with the data for the acetates 2b, 3b, 4b, and 5b. Observed selectivities are rationalized by concerning steric and electronic effects.
    Notes: Die Monotosylierung der 1,6-Anhydro-β-D-mannofuranose (1) mit Tosylchlorid in Pyridin liefert hochselektiv das 5-O-Tosylat 2a (79%). Daneben konnten in geringer Menge das 3-O-Monotosylat 3a (0.4%) sowie die 2,5- und 3,5-Di-O-tosylate 4a (3.5%) bzw. 5a (1.2%) isoliert werden. Die Identifizierung der Produkte erfolgte durch 1H-NMR-Spektroskopie unter Berücksichtigung der Daten für die Acetate 2b, 3b, 4b und 5b. Die beobachteten Selektivitäten werden unter Beachtung elektronischer und sterischer Faktoren interpretiert.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840907
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  • 6
    Electronic Resource
    Electronic Resource
    Konformationsanalyse, XXIV. Bestimmung der Konformationen von Tri- und Tetrasaccharid-Sequenzen der Core-Struktur von N-Glycoproteinen. Problem der (1 → 6)-glycosidischen Bindung (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 951-976 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Confomational Analysis, XXIV. - determination of the Conformations of Tri-and Tetrasaccharide Sequences of N-Glycoproteins. The problem of the (1 → 6)-glycosidic BondThe preferred solution conformations of the saccharides α-D-Man(1 → 3)-β-D-Man(1 → 4)-D-GIcNAc (1), α-D-Man(1 → 6)-β-Man(1 → 4)-D-GIcNAc (2), and α-D-Man(1 → 3)[α-D-Man(1 → 6)]lβ-D-Man(1 → 4)-D-GIcNAc3), which are known as parts of the core structure of N-glycoproteins, could be established by use of HSEA calculations (HSEA: Hard-Sphere Exo-Anomeric) with the new program GESA (= Geometry of Saccharides) in connection with 1H NMR investigations like NOE experiments, spin-lattice relaxation-time measurements and the observation of selective deshieldings. (1 → 3)- and (1 → 4)-glycosidic bonds show one strongly preferred conformation. The greater flexibility of the (1 → 6)-glycosidic bonds show one strongly preferred conformation. The greater flexibility of the (1 → 6)-glycosidic bond will be discussed in details. For the spectra analysis various 2-D techniques have been used.
    Notes: Von den Sacchariden α-D-Man(1 → 3)-β-D-Man(1 → 4)-D=-GICNAc (1), α-D-Man(1 → 6)-β-D-Man(1 → 4)-D-GIcNAc(2) und α-D-Man(1 → 3)[α-D-Man(1 → 6)]-β-D-Man(1 → 4)-D-GlcNAc(3), die als Core-Struktur in N-Glycoproteinen vorkommen, wurden durch HSEA-Berechnungen (HSEA: Hard-Sphere Exo-Anomeric) mit dem neuen GESA-Programm (GESA: Geometry of Saccharides) die bevorzugten Konformationen bestimmt. Mit Hilfe von 1H-NMR-Experimenten, nämlich NOE-Experimenten, Spin-Gitter-Relaxationszeitmessungen und der Beobachtung selektiver Entschirmungen, ließen sich diese Konformationen in Lösung bestätigen. (1 → 3)- und (1 → 4)-glycosidische Bindungen weisen eine stark bevorzugte Konformation auf. Die weitaus größere Flexibilität der (1 → 6)-glycosidischen Bindung wird besonders diskutiert. Zur Analyse der Spektren wurden verschiedene 2-D-NMR-Techniken angewandt.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840514
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  • 7
    Electronic Resource
    Electronic Resource
    Synthesen und absolute Konfigurationen von (+)-(6R,2′S)-Cryptocaryalacton und (-)-(6S,2′S)-Epicryptocaryalacton (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 977-981 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses und absolute Configurations of (+)-(6R,2′S)-Cryptocaryalactone and (-)-(6S,2′S)-EpicryptocaryalatoneThe naturally occurring (+)-cryptocaryalactone [(+)-4] and the (-)-epicryptocaryalactone [(-)-5] have been synthesized starting from the optically active aldehyde. 1. The absolute configuraitons of these unsaturated lactones were determined by circular dichroism measurements.
    Notes: Das natürliche (+)-Cryptocaryalacton [(+)-4] und das (-)-Epicryptocaryalation [(-)-5] wurden, ausgehend von optisch aktivem Aldehyd 1, synthetisiert. Die absoluten Konfigurationen dieser ungesättigten Lactone wurden mit Hilfe des Circulardichroismus bestimmt.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840515
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  • 8
    Electronic Resource
    Electronic Resource
    Ternäre Bromide mit Lithium und Silber: RbLiBr2, CsLiBr2 und CsAgBr2 (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 513 (1984), S. 15-21 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ternary Lithium and Silver Bromides: RbLiBr2, CsLiBr2, and CsAgBr2RbLiBr2, CsLiBr2, and CsAgBr2 are obtained by reactions of the corresponding binary bromides. X-ray powder patterns and a single-crystal study of RbLiBr2 show that the bromides are isotypic with the corresponding chlorides. The (formal) relationship of the crystal structures of RbLiBr2 and CsAgBr2 is described.
    Notes: RbLiBr2, CsLiBr2 und CsAgBr2 erhält man aus den entsprechenden binären Bromiden. Die röntgenographische Untersuchung von Pulverproben und eines Einkristalls von RbLiBr2 belegt die Isotypie zu den jeweils analogen Chloriden. Die (formale) Verwandtschaft der Kristallstrukturen von RbLiBr2 und CsAgBr2 wird beschrieben.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845130603
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  • 9
    Electronic Resource
    Electronic Resource
    GdLiCl4, ein inverser Chloroscheelit (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 511 (1984), S. 193-200 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: GdLiCl4, an inverse ChloroscheeliteVarious synthetic routes (GdCl3 + Li; GdCl3 + LiCl; thermal decomposition of (NH4)2LiGdCl6) lead to the first inverse chloroscheelite GdLiCl4 [tetragonal, I41/a, a = 645.77(7), c = 1316.0(2) pm, Guinier data, route 3] with the shortest c/a ratio (2.037) known so far for scheelites. The crystal structure has been refined from single crystal data (R = 0.073, Rw = 0.040) and is derived from the CaF2 type structure by successive compression (Θ = 54.73° → Θ = 63.60°) and rotation (ϕ = 45° → ϕ = 31.12°) of the [LiCl4] tetrahedron with d(Li—Cl) = 237.7(2) pm. The sucessive steps were followed by calculations of the Madelung Part of Lattice Energy, MAPLE. A comparison with other known haloscheelites (TlTlCl4, KTlCl4, YbLiF4) is undertaken. The compression angle Θ may be taken as a measure for the distortion of the [LiCl4] tetrahedron (“tetrahedricity”).
    Notes: Verschiedene Wege (GdCl3 + Li; GdCl3 + LiCl; thermischer Abbau von (NH4)2LiGdCl6) führen zu dem ersten inversen Chloroscheeliten GdLiCl4 [tetragonal, I41/a, a = 645,77(7); c = 1316,0(2) pm, Guinier-Daten, Weg 3] mit dem kleinsten bislang für Scheelite bekannten Verhältnis c/a von 2,037. Die Kristallstruktur wurde aus Einkristalldaten verfeinert (R = 0,073; Rw = 0,040) und modellhaft aus der Struktur des CaF2 durch sukzessives Stauchen (Θ = 54,73 → Θ = 63,60°) und Drehen (ϕ = 45° → ϕ = 31,12°) des Tetraeders [LiCl4], d(Li—Cl) = 237,7(2) pm, abgeleitet und die einzelnen Schritte durch Berechnungen des Madelunganteiles der Gitterenergie, MAPLE, verfolgt sowie mit bekannten Halogenscheeliten (TlTlCl4, KTlCl4, YbLiF4) verglichen. Der Stauchungswinkel Θ kann als ein Maß für die Verzerrung des Tetraeders [LiCl4] („Tetraedrizität“) verwendet werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845110420
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  • 10
    Electronic Resource
    Electronic Resource
    Na3GdCl6: Einkristalle der Tieftemperaturform bei der metallothermischen Reduktion von GdCl3 mit Na (1984)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 517 (1984), S. 191-197 
    Details
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Na3GdCl6: Single Crystals of the Low Temperature Form by Metallothermic Reduction of GdCl3 with NaSingle crystals of Na3GdCl6-I (low-temperature form, transition to form II at 205°C) are obtained by reaction of GdCl3 with Na (tantalum tube, 700°C, 9 d). The crystal structure [a = 700.72(8), c = 1879.1(3) pm, c/a = 2,682, Vm = 160.40(3) cm3 mol-1, trigonal, R3 (No. 148), Z = 3] may be derived from the LiSbF6 type: Na2 ≙ Li Gd ≙ Sb, Cl: ¨AB¨ or h6, with two Na 1 statistically distributed over four “octahedral” in terstices.
    Notes: Bei der Umsetzung von GdCl3 mit Na (Tantalampulle, 700°C, 9d) erhält man Einkristalle von Na3GdCl6-I (Tieftemperaturform, Umwandlung in Form II bei 205°C). Die Kristallstruktur [a = 700,72(8), c = 1879,1(3) pm, c/a = 2,682, Vm = 160,40(3) cm3mol-1, trigonal, R3 (Nr. 148), Z = 3] kann als aufgefüllter LiSbF6-Typ (Na2 ≙ Li, Gd ≙ Sb, Cl: ¨AB¨ bzw. h6) aufgefaßt werden. Zwei Na 1 besetzen statistisch jeweils zur Hälfte vier „Oktaederlücken“.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19845171019
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