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  • Chemistry  (13,362)
  • GENERAL  (96)
  • 1955-1959  (13,458)
  • 1
    Electronic Resource
    Electronic Resource
    π-Komplexe Der Übergangsmetalle II. Substituierte Di-Benzol-Chrom-Verbindungen (1957)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 606 (1957), S. 209-215 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Di-benzol-chrom(I)- und Bis-(monodeuterium-benzol)-chrom(I)-Salze ließen sich ausgehend von Phenylmagnesiumbromid und Chrom(III)-chlorid isolieren. Belege für deren Struktur und für den Reaktionsmechanismus werden gegeben. Ferner wird die Bildung der im Verlaufe dieser Umsetzung ebenfalls erhaltenen Benzol-diphenyl-, (Monodeuterium-benzol)-diphenyl- und Bis-diphenyl-chrom-(I)-Salze diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19576060122
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  • 2
    Electronic Resource
    Electronic Resource
    ζ-Pyrromycinon (1957)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 69 (1957), S. 477-478 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19570691309
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  • 3
    Electronic Resource
    Electronic Resource
    γ-Isospartein, ein neues Isomeres des Sparteins (1958)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 617 (1958), S. 147-152 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Durch katalytische Hydrierung der Base II wurde ein neues Isomeres des Sparteins (γ-Isospartein) erhalten, dem im Ring A Wannenform zugeschrieben wird. Durch AlCl3 wird das γ-Isospartein in Spartein und α-Isospartein umgelagert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19586170115
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  • 4
    Electronic Resource
    Electronic Resource
    γ-Isospartein, ein neues Isomeres des Sparteins (1958)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 619 (1958), S. 191-191 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.19586190121
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  • 5
    Electronic Resource
    Electronic Resource
    γ-irradiation of styrene copolymers (1959)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 1 (1959), S. 296-299 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Copolymers of styrene-methyl methacrylate were irradiated in vacuo with γ-rays; viscosity changes and gas yields (moles gas per mole methyl methacrylate in copolymer) for H2, CO, CO2, CH4, HCOOCH3, and CH3OH were examined at doses of 1.0 Mrep to 10.0 Mrep. It was found that styrene molecules protect the copolymer from degrading while decreasing the gas yields up to a styrene concentration of about 0.5 mole fraction; above this concentration, these radiation effects are independent of composition. When styrene-methyl acrylate copolymers were irradiated, styrene offered protection aganist gelation but simultaneously increased the gas yields (gases liberated were identical with those from the first system).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1959.070010305
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  • 6
    Electronic Resource
    Electronic Resource
    γ-Irradiation of solid hexamethylcyclotrisiloxane (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 41 (1959), S. 547-549 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1204113860
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  • 7
    Electronic Resource
    Electronic Resource
    γ-Irradiation of rubber and styrene. Graft polymer formation (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 35 (1959), S. 17-29 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Styrene, styrene mixed with rubber, and rubber alone have been exposed to γ-radiation from Co-60. The G value for polymerization-initiating radicals formed from rubber in the mixture, G(i.r) = 0.26, has been calculated from corresponding values obtained by estimation of the number of polystyrene molecules formed in styrene and in the mixture. A G (radical) value for rubber when irradiated alone, G(r), has been assessed from a G (crosslinking) value, G(X), which was determined under closely similar experimental conditions, as G(r) = 2G(X) ∼ 6. The large discrepancy between G(r) and G(i.r.) cannot be explained satisfactorily on the supposition that radicals formed from rubber have a low efficiency in initiating the polymerization of styrene. Therefore, it is argued that the G(r) value itself is lower in the mixture. Evidence for this argument is provided by the lower rate of gelling in the mixture. this protection of rubber by energy transfer to styrene is an important example since in only one previous case has experimental evidence been provided to exclude an alternative radical mechanism. By polymerization in the presence of crosslinked rubber, uncombined polystyrene could be readily partioned into the sol fraction by equilibration of the gross polymer in benzene. About 15% of the polystyrene was free. Hexachloroethane was chosen as an example of an additive with a high G (radical) value. As would be expected, it increases the rate of polymerization but does not lead to a correspondingly large amount of free polystyrene (about 23%). Graft polymer formation from styrene and methyl methacrylate is compared and attention is drawn to the importance of the formation and subsequent reactions of initially nonpolymeric radicals in determining the proportion of free plastomer.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1203512803
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  • 8
    Electronic Resource
    Electronic Resource
    γ-Amino-dicarbonsäuren aus Enaminen (1958)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 91 (1958), S. 1996-1999 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Enamine werden mit α,β-ungesättigten Fettsäureestern in Cyclanon-carbon-säureester übergeführt und letztere durch Stickstoffwasserstoffsäure in γ-Amino-dicarbonsäuren umgewandelt. Auf diese Weise wurden γ-Amino-kork- und γ-Amino-azelainsäure erhalten.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19580910936
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  • 9
    Electronic Resource
    Electronic Resource
    γ,γ-Dimethyl-allyl-pyrophosphat und Geranyl-pyrophosphat, biologische Vorstufen des Squalens Zur Biosynthese der Terpene, VI1) (1959)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 71 (1959), S. 657-663 
    Details
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 3-Methyl-Δ3-butenyl-1-pyrophosphat (Isopentenyl-pyrophosphat) spielt im Stoffwechsel die Rolle eines „aktiven Isoprens“, d. h. es ist der gemeinsame Baustein aller unter die „Isoprenregel“ fallenden Naturstoffe. Es wird über die 6-fache Anreicherung einer Isopentenyl-pyrophosphat-Isomerase aus Hefe berichtet, die Isopentenyl-pyrophosphat in Dimethyl-allyl-pyrophosphat umwandelt, das dann als Starter für den Aufbau von Terpen-Kohlenstoffketten aus C5-Einheiten dient. Die Verknüpfung der C5-Einheiten besorgt das Enzym Farnesyl-pyrophosphat-Synthetase, das aus Hefe 20-fach angereichert werden konnte. Setzt man in die Synthetase-Reaktion Isopentenyl-pyrophosphat neben einem großen Überschuß von Dimethyl-allyl-pyrophosphat ein, so läßt sich als erstes Kondensationsprodukt Geranyl-pyrophosphat nachweisen, das durch Anfügen einer weiteren C5-Einheit in Farnesylpyrophosphat übergeht. Damit sind jetzt alle Syntheseschritte geklärt, die auf dem Wege vom Acetyl-CoA zum Squalen liegen, das seinerseits wieder Vorstufe der cyclischen Triterpene und Sterine ist.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19590712102
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  • 10
    Electronic Resource
    Electronic Resource
    β-Yohimbin aus den Wurzeln von Rauwolfia canescens L. 6. Mitteilung über Rauwolfia-Alkaloide (1955)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 38 (1955), S. 536-538 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Es wird die Isolierung von β-Yohimbin aus den Wurzeln von Rauwolfia canescens L. beschrieben.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19550380223
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