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  • 1990-1994  (5)
  • 1955-1959  (12)
  • Inorganic Chemistry  (14)
  • Conformational analysis of highly flexible molecules  (2)
  • Cell & Developmental Biology
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 92 (1959), S. 2460-2468 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch alkalische Hydrolyse und durch Synthese aus Trimethylamin, Formaldehyd und Benzolsulfochlorid wird bewiesen, daß es sich bei dem „Vorländerschen Salz“ nicht um Benzolsulfonyl-trimethylammoniumchlorid, sondern um Benzolsulfonyloxymethyl-trimethyl-ammoniumchlorid („Benzolsulfonyl-formocholinchlorid“) handelt.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Developmental Dynamics 199 (1994), S. 103-115 
    ISSN: 1058-8388
    Keywords: Nanos ; Maternal effect ; Posterior determinant ; RNA localization ; Grandchildless mutations ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The Drosophila gene nanos is required for two processes. During oogenesis, nanos function is required for the continued production of egg chambers, and nanos is expressed in the early germarium. During embryogenesis, nanos is required maternally to specify abdominal segmentation. Nanos shares this latter function with nine other genes, collectively known as the posterior group. Of this group, nanos encodes a determinant, and is localized as an RNA to the posterior pole of early embryos. This RNA is translated to form a gradient of nanos protein with highest concentrations at the posterior. Analysis of the distribution of nanos gene products in embryos mutant for posterior group genes shows that eight of these genes are required for localization, but not stability, of the nanos RNA. Embryos mutant for posterior group alleles which produce weak abdominal phenotypes show reduced amounts of localized nanos RNA. This correlation between nanos RNA localization and abdominal phenotype suggests that nanos acts as a localization-dependent posterior determinant. Localization of nanos is not affected by mutations in bicoid or torso, confirming that the three maternal systems of anterior-posterior determination initially act independently. © 1994 Wiley-Liss, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 90 (1957), S. 1000-1007 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Im Extrakt aus den reifen Schoten des Johannisbrotes wurden neben Xylose, Fructose, Glucose und Saccharose mehrere weitere Oligosaccharide nachgewiesen. Von diesen. wurden zwei reduzierende Disaccharide auch präparativ isoliert und als Xylosido-glucose und Fructosido-glucose gekennzeichnet. Das xylosehaltige Disaccharid erwies sich nach den Eigenschaften des Heptaacetats als identisch mit Primverose; das fructosehaltige Disaccharid, das bisher noch nicht beschrieben war und Ceratose genannt wird, konnte durch Kristallisation eines Azobenzolsulfonylhydrazons sowie eines Oktaazobenzolcarbonsäureesters charakterisiert werden. - Im Laufe der Reifung der Johannisbrotfrucht nimmt die Zahl der nachweisbaren Zucker ständig zu.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: In Fortführung früherer Untersuchungen wurde 2.2′-Dilithium-diphenyl mit weiteren Metallchloriden umgesetzt. Während die Salze von Metallen mit abgeschlossener Elektronenkonfiguration stabile Derivate lieferten, konnten diese bei Einwirkung von Me2⊕-lonen mit unvollständig besetzten 3d-Niveaus nicht isoliert werden. Die vermutlich primär entstehenden Metall-Organika zerfielen in Metall und aromatische Kohlenwasserstoffe, die je nach dem ein gesetzten Metallchlorid verschieden konstituiert sind. Besonderes Interesse bieten neben dem entstehenden Tetraphenylen die noch unbekannten Phenylenyhomologen Hexaphenylen und Oktaphenylen, deren Strukturen festgelegt werden und deren Bildungsweise erörtert wird.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 90 (1957), S. 2521-2526 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Konstitution des bei alkalischer Autoxydation von β-Tetralon entstehenden Farbstoffes wird aufgeklärt.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 620 (1994), S. 357-360 
    ISSN: 0044-2313
    Keywords: Template Reaction ; Benzolhydrazido(2-)-acetylacetonebenzoylhydrazonato(2-)-oxomolybdenum(VI) ; Acetylacetonebenzoylhydrazone ; Mass Spectra ; Crystal Structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Template Reaction of Bis(acetylacetonato)-dioxo-molybdenum(VI) with BenzoylhydrazoneBy reaction of bis(acetylacetonato)-dioxo-molybdenum(VI) with benzoylhydrazine benzoylhydrazido(2-)-acetylacetonebenzoylhydrazonato(2-)-oxo-molybdenum(VI) was formed beside another species. The compound was characterized by mass spectrometry and X-ray structural analysis. Crystallographic data see „Inhaltsübersicht“.
    Notes: Als Reaktionsprodukt der Umsetzung von Bis(acetylacetonato)-dioxo-molybdän(VI) mit Benzoylhydrazin in Gegenwart von Triphenylphosphan wurde Benzoylhydrazido-(2-)-acetylacetonbenzoylhydrazonato(2-)-oxo-molybdän(VI) neben einem weiteren Molybdänkomplex erhalten und massenspektrometrisch sowie röntgenkristallstrukturanalytisch charakterisiert. (Raumgruppe Cc, Z = 4, 2 020 beobachtete Reflexe, R = 3,7%. Gitterabmessungen bei 19°C: a = 1 188,5(2) pm, b = 2 110,2(2) pm, c = 813,2(2) pm, β = 105,77(2)°).
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 0044-2313
    Keywords: Fluoro-phthalocyaninato hydrogenate ; u.v.-vis., i.r., r.r. spectra ; 1H, 13C, 19F n.m.r. spectra ; cyclovoltammetry ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Synthesis und Properties of Bis(tetra-n-butylammonium)-fluoro-phthalocyaninato-hydrogenate-pentahydrateDarkgreen cubic crystals (a = 21.446(10) Å) of bis(tetra-n-butylammonium)-fluoro-phthalocyaninatohydrogenate-pentahydrate, (Bu4N)2[HFPc(2-)] · 5H2O, are prepared by the reaction of H2Pc(2-) with excess (Bu4N)F · 3H2O preferably in dichloromethane or pyridine. The thermal analysis shows two endothermic losses in weight corresponding to the evaporation of crystal water at T 〉 125°C and the decomposition of the complex salt giving H2Pc(2-) at T 〉 180°C, respectively. The electrochemical (cv) and spectroscopical properties (uv-vis, i.r., resonance Raman, 1H, 13C, and 19F nmr spectra) are investigated and the characteristic differences with those of H2Pc(2-) are discussed.
    Notes: Dunkelgrüne, kubische Kristalle (a = 21,446(10) Å) von Bis(tetra-n-butyl-ammonium)-fluoro-phthalocyaninatohydrogenat-pentahydrat, (Bu4N)2[HFPc(2-)] · 5H2O, werden durch die Umsetzung von H2Pc(2-) mit überschüssigem (Bu4N)F · 3H2O bevorzugt in Dichlormethan oder Pyridin dargestellt. Die thermische Analyse zeigt zwei endotherme Gewichtsverluste, die bei T 〉 125°C der Abgabe des Kristallwassers und bei T 〉 180°C der Zersetzung des Komplexsalzes unter Bildung von H2Pc(2-) entsprechen. Die elektrochemischen (CV) und spektroskopischen Eigenschaften (UV-VIS-, IR-, Resonanz-Raman-, 1H-, 13C- und 19F-NMR-Spektren) werden beschrieben und mit denen von H2Pc(2-) verglichen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 68-70 
    ISSN: 0749-1581
    Keywords: 1H NMR ; Lanthanide-induced shift (LIS) method ; Conformational analysis of highly flexible molecules ; Calculation algorithm ; Molecular mechanics ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new method for lanthanide-induced shift (LIS) calculations of highly flexible structures was developed using molecular geometries obtained from the random variation of dihedral angles (up to ten) which are rotating freely and independently of each other. The result of the new method (program JLLISMUL) is a data set containing the specified random dihedral angles and the corresponding agreement factor R (as a criterion for the fitting of the calculated and experimental LIS values). For comparison, the same random procedure was also used for parallel force field calculations using the molecular mechanics program PIMM. The results obtained by the new method are in very good agreement with known or reported preferred conformations of five highly flexible molecules which were used as examples for examining the new strategies of obtaining the preferred conformers. The minima of both the ‘LIS R factor hyper surface’ and the ‘energy hyper surface’ are rapidly accessible.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 31 (1993), S. 367-370 
    ISSN: 0749-1581
    Keywords: 1H NMR ; Lanthanide-induced shift (LIS) ; Conformational analysis of highly flexible molecules ; Steepest descent (STEED) LIS calculation algorithm ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new method and computer program for LIS calculations of highly flexible molecules was developed using molecular geometries obtained by randomly varied dihedral angles (up to ten angles rotating freely and independently from each other are possible) as start conformations for a STEEpest Descent (STEED) search algorithm to find minima characterized by the R factor at the ‘LIS R factor hyper surface.’ This STEED-LIS method allows easy, accurate and rapid access to the probable global minimum of the R factor depending on up to ten variable dihedral angles. This means that LIS investigations of highly flexible molecules with more than one freely rotating dihedral angle are no longer complicated and time consuming, but can be carried out automatically using the developed programs [JLLISSD (with interactive parameter dialogue) and LISSDEMU (using parameter input files prepared by LISSDINP)]. The results obtained are in very good agreement with known or reported preferred conformations of the investigated test compounds, propan-1-ol, butan-1-ol and ethyl p-methoxycinnamate.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 287 (1956), S. 1-11 
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Anstelle der Elektronegativitäten nach Pauling werden zur Abschätzung der Polarität einer chemischen Bindung Rumpfladungszahlen auf der Basis der Ionisierungsenergien abgeleitet.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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