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  • 1
    Electronic Resource
    Electronic Resource
    Thioxo-analoga isoindigoider verbindungen?
    Amsterdam : Elsevier
    Tetrahedron Letters 35 (1994), S. 1977-1980 
    Details
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0040-4039(00)73026-7
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  • 2
    Electronic Resource
    Electronic Resource
    Analysis of the stability of embankment slopes by the method of limiting equilibrium (1993)
    Springer
    Soil mechanics and foundation engineering 30 (1993), S. 193-196 
    Details
    ISSN: 1573-9279
    Source: Springer Online Journal Archives 1860-2000
    Topics: Architecture, Civil Engineering, Surveying , Geosciences
    Notes: Abstract A method is suggested for calculating the slope stability of a soil mass, which differs from known methods based on equations for the equilibrium of individual elements of the mass in its assumptions about the height of application of interelement forces used by the author to derive a solution. There is a program for automated calculation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01712257
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  • 3
    Electronic Resource
    Electronic Resource
    Calculations on (γ, p) and (γ, n) reactions at photon energies between 40 and 100 MeV
    Amsterdam : Elsevier
    Nuclear Physics, Section A 186 (1972), S. 353-364 
    Details
    ISSN: 0375-9474
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0375-9474(72)90052-8
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesen auf der Basis von 2-Oxoglutarsäure. IV. Regioselektive Synthese substituierter 2-(2-Methoxycarbonyl-2H-thiopyran-3-yl)glyoxylsäuremethylester (1994)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 336 (1994), S. 163-165 
    Details
    ISSN: 0941-1216
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Organic Syntheses Based on 2-Oxoglutaric Acid. IV. Regioselective Synthesis of Substituted Methyl 2-(2-methoxy-carbonyl-2H-thiopyran-3-yl)glyoxylates
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prac.19943360212
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Struktur eines ungewöhnlichen Tetramers des Lithiumphenolats: [C6H5OLi · C4H8O]4 · C6H5OH (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 749-752 
    Details
    ISSN: 0044-2313
    Keywords: Lithium phenoxide ; x-ray structure analysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Structure of an unusual Tetramere of Lithium Phenoxide: [C6H5OLi · C4H8O]4 · C6H5OHSingle crystals of lithium phenoxide have been obtained from THF. In the structure (P 21/n, Z = 4, a = 11.69 Å, b = 21.15 Å, c = 18.55 Å, β = 91.11°) four lithium atoms and four phenoxide oxygen atoms are cubically arranged. Further, each lithium atom coordinates the oxygen atom of a tetrahydrofuran molecule. The ideal cubeform structure is disturbed by one phenol molecule which is coordinated in addition to four phenoxide and four THF molecules. Hence, one edge of the cube (Li4—O4) is substituted by the coordination of the phenol oxygen atom O5 with Li4 and hydrogen bonding between O4 and the hydroxy group of phenol. Van der Waals forces are the only interaction between these complexes.
    Notes: Einkristalle von einem tetrameren Lithiumphenolat-THF-Phenol-Komplex wurden aus THF kristallisiert. In der Kristallstruktur (P 21/n, Z = 4, a = 11,69 Å, b = 21,15 Å, c = 18,55 Å, β = 91,11°) sind vier Lithiumatome und vier Sauerstoffatome des Phenolats würfelförmig angeordnet. Jedes Lithium koordiniert außerdem noch mit dem Sauerstoffatom eines Tetrahydrofuranmoleküls. Die Anlagerung eines Phenolmoleküls an diese cubanartige Struktur bewirkt das Aufbrechen einer Würfelkante (Li4—O4). Dennoch wird die Koordinationszahl 4 von diesen beiden Atomen erreicht: Li4 ist mit dem Sauerstoff (O5) des Phenolmoleküls verknüpft, O4 bildet eine Wasserstoffbrücke zur Hydroxylgruppe des Phenol aus. Außer van-der-Waals-Kräften gibt es keine weiteren Wechselwirkungen zwischen den Komplexen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200428
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  • 6
    Electronic Resource
    Electronic Resource
    Zur Struktur von zwei Hydraten des Natriumphenolats: C6H5ONa · H2O und C6H5ONa · 3 H2O (1994)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 743-748 
    Details
    ISSN: 0044-2313
    Keywords: Sodium phenoxide hydrates ; x-ray structure analysis ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Structures of two Hydrates of Sodium Phenoxide: C6H5ONa · H2O and C6H5ONa · 3 H2OIn the monohydrate of sodium phenoxide sodium is coordinated by 4 oxygen atoms having an average distance Na—O of about 2.631 Å being arranged in form of a distorted tetrahedron. The oxygen atoms of water and phenoxid serve as bridging ligands. Hence, the structure can be considered as a network with a general formula ∞2[Na[4]O2[2]]. Moreover, the oxygen atoms are linked via hydrogen bonding.In the trihydrate of sodium phenoxide sodium is surrounded with 5 oxygen atoms with an average distance of 2.39 Å forming a tetragonal pyramide. The oxygen of the phenoxide, however, does not participate in the coordination of the sodium ion. The coordination polyhedrons are connected by sharing edges and verteces. The resulting layer can be described by the general formula ∞2[Na[5]O2[2]O[2]O[1]]. Via hydrogen bonding the phenoxide ions are attached to this layer.
    Notes: Im Monohydrat des Natriumphenolats sind die Natriumionen verzerrt tetraedrisch durch vier Sauerstoffatome koordiniert. Der mittlere Bindungsabstand Na—O beträgt 2,631 Å. Die Sauerstoffatome des Wassers und der Phenolationen fungieren als Brückenliganden. Daraus ergibt sich eine Schichtstruktur, die man als ∞2[Na[4]O2[2]] beschreiben kann. Zusätzlich kommt es zur Ausbildung von Wasserstoffbrückenbindungen.Im Trihydrat ist das Natriumion von fünf Sauerstoffatomen, die einen mittleren Abstand von 2,39 Å haben, quadratisch pyramidal umgeben. Der Phenolatsauerstoff ist nicht an der Koordination beteiligt. Die gegenseitige Verknüpfung der Koordinationspolyeder erfolgt über Ecken und Kanten zu einer Schichtanordnung ∞2[Na[5]O2[2]O[2]O[1]]. Die Phenolatsauerstoffatome sind über Wasserstoffbrücken mit dieser Schicht verknüpft.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19946200427
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  • 7
    Electronic Resource
    Electronic Resource
    Synthese und Charakterisierung von Metallocen-Chelaten heterocyclischer 1,2-DiselenolateProfessor Eberhard Hoyer zum 65. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 1979-1986 
    Details
    ISSN: 0044-2313
    Keywords: Metallocene-diselenolates ; DNMR ; EPR ; X-Ray ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis and Characterization of Metallocene Chelates of Heterocyclic 1,2-DiselenolatesSynthesis and properties of metallocen diselenolates Cp2RML (CpR = η5-C5H4CH3 (Cp′); η5-C5(CH3)4 C2H5 (Cpo)) of titanium(IV) and vanadium(IV) with L = dsit (1,3-dithiole-2-thione-4,5-diselenolate), dsise (1,3-dithiole-2-selone-4,5-diselenolate) dsitse (1,3-thiaselenole-2-selone-4,5-diselenolate) and dsis (1,3-diselenole-2-selone-4,5-diselenolate) are described. The structures of these compounds in solution are discussed using 1H, 13C, 77Se NMR and EPR data. Their voltammetric behaviour is investigated in dichloromethane. The activation parameters of the chelate ring inversion of the titanocene diselenolates (Cp2RTiL) and the x-ray structures of Cp2′Ti(dsit), Cp2oTi(dsit); Cp2oTi(dsise) (2 modifications) and Cp2oTi(dsis) are reported.
    Notes: Synthese und Eigenschaften neuer Metallocen-Diselenolate CpR2ML (CpR = η5-C5H4CH3 (Cp′); η5C5(CH3)4C2H5 (Cpo)) des Titan(IV) und Vanadium(IV) mit L = dsit(1,3-Dithiol-2-thion-4,5-diselenolat), dsise (1,3-Dithiol-2-selon-4,5-diselenolat) dsitse (1,3-Thiaselenol-2-selon-4,5-diselenolat) und dsis (1,3-Diselenol-2-selon-4,5-diselenolat) und dsis (1,3-Diselenol-2-selon-4,5-diselenolat) werden beschrieben. Die Strukturen der Verbindungen in Lösung werden anhand der 1H-, 13C-, 77Se-NMR- und EPR-Spektren sowie ihres Redoxverhaltens diskutiert. Die durch dynamische Kernresonanzspektroskopie bestimmten Aktivierungsparameter der Chelatringinversion der Titanocen-Diselenolate (CpR2TiL), sowie die Röntgenkristallstrukturanalysen von Cp′2Ti(dsit), Cp2oTi(dsit); Cp2oTi(dsise) (2 Modifikationen) und Cp2oTi(dsise) werden vorgestellt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966221128
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  • 8
    Electronic Resource
    Electronic Resource
    Hamster oocyte penetration tests with oocytes frozen in propanediol: Comparison with non-frozen oocytes (1989)
    New York, NY : Wiley-Blackwell
    Gamete Research 24 (1989), S. 31-34 
    Details
    ISSN: 0148-7280
    Keywords: hamster egg penetration tests ; frozen vs. fresh eggs ; propanediol-sucrose ; human spermatozoa ; human infertility ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology
    Notes: Hamster oocytes were frozen using a 1,2-propanediol-sucrose procedure, which resulted in over 90% survival. After thawing and zona removal the oocytes were compared with non-frozen oocytes in a zona-free hamster egg test employing spermatozoa from human semen donors and suspected infertility patients. Similar data were obtained, indicating that propancdiol-sucrose frozen hamster eggs may be used in place of fresh eggs for convenience and to a void scheduling problems.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrd.1120240106
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