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  • Chemistry  (21)
  • 1980-1984  (21)
  • 1970-1974
  • 1984  (21)
  • 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
    Control strategies of continuous bioprocesses based on biological activities (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 26 (1984), S. 916-925 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Based on the material balance principle applied to microbial reactions in continuous bioprocesses, the concept of reaction rate control has been developed theoretically. This concept provides a more direct way of controlling biological activities than the control of physical or chemical parameters in practice today. From an analysis of dynamic and steady-state experiments, two control systems for carbon dioxide production rate control during the continuous culture of baker's yeast have been designed and evaluated experimentally. In these control methods, intracellular NADH concentration is used as an immediate indication of the onset of glucose repression. A more sophisticated master controller based on the respiratory quotient can be combined with these control methods. The resulting control system provides a means to indirectly optimize biomass production while preventing ethanol formation in the continuous culture of baker's yeast.
    Additional Material: 15 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260260816
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  • 5
    Electronic Resource
    Electronic Resource
    Surface properties determine bioadhesive outcomes: Methods and results (1984)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 18 (1984), S. 337-355 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: This investigation developed experimental evidence for the influence of different surface energy states on tissue incorporation of biomedical materials. Implants of two smooth metals, each with three different surface energy states, were placed in the subdermal fascial plane of the backs of New Zealand White rabbits and were allowed healing times of 10 and 20 days. The implant surfaces were thoroughly characterized by physical-chemical criteria prior to surgical placement and again following removal from the tissue capsules generated by the host animals. Quantitative histopathologic analysis, using standard morphometric criteria, of the adjacent tissues revealed up to a threefold increase of fibroblastic-fibrocytic cells against the initially scrupulously cleaned, high-surface-energy materials. The cells were flattened and active, producing tenacious bonds through a thin pre-adsorbed protein-dominated “conditioning” film, that could be broken only by cohesive failure in the tissue itself. In contrast, the lower-surface-energy materials typical of standard dental implants were “walled off” by a cell-poor, nonadhesive capsule with a fibrous interface separated from a thicker “conditioning” film by a lipid-rich mucus zone. The advantages of proper surface treatment to favor the desired degree of biological adhesion are apparent.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820180404
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  • 6
    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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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Selenium-77 NMR chemical shifts of five-membered selenium and sulphur heterocycles with C=Se, C=S, and C=O groups (1984)
    Chichester : Wiley-Blackwell
    Organic Magnetic Resonance 22 (1984), S. 480-485 
    Details
    ISSN: 0030-4921
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: This paper reports the 77Se NMR chemical shifts of 1,3-dithiole-, 1,3-thiaselenole- and 1,3-diselenole-2-ones, -thiones and -selones, of the corresponding saturated compounds 1,3-diselenolane-2-one, -thione and -selone, and the 1,3-thiaselenolium tetrafluoroborates, either unsubstituted or substituted by morpholino, ethylthio or ethylseleno groups in the 2-position. The 77Se chemical shift values of the ring selenium and the C=Se groups are compared with the 13C chemical shift values of neighbouring carbon atoms. The relationships between the 77Se chemical shifts of the C=Se groups and the wavelengths of their n→* absorption in the UV-visible spectrum are discussed with respect to the significance of the δE term in the contribution of the paramagnetic screening and the electron density distribution.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mrc.1270220803
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