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  • Wiley-Blackwell  (24)
  • Molecular Diversity Preservation International (MDPI)
  • American Chemical Society (ACS)
  • 1985-1989  (24)
  • 1
    Electronic Resource
    Electronic Resource
    Photocycloadditions of 2-(trimethylsilyloxy)-1,3-butadiene to 2-cycloalkenones. Access to the basic pentalenolactone skeletonPreliminary communication: [1]. (1988)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 71 (1988), S. 1392-1398 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The [2 + 2] Photocycloaddition of 2-(trimethylsilyloxy)-1,3-butadiene to a number of 2-cycloalkenones proved to be quite a general reaction leading to good yields of the cycloadducts (Table). This finding is surprising since dienes, in general, are better known as quenchers of enone triplets rather than as photochemical reactants. Both the high substrate concentrations, which can be employed in these cycloadditions, and the remarkable regio and stereoselectivity of the processes qualify them as valuable for syntheses. In a first application, the photoproducts 1a, b were transformed in three steps into a viable precursor 4 of the pentalenolactone-G and -H antibiotics.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19880710603
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  • 2
    Electronic Resource
    Electronic Resource
    A facile synthesis of substituted perhydro-1,3-thiazin-4-ones and 2-thioxoperhydro-4-pyrimidinones (1988)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1988 (1988), S. 983-987 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Eine einfache Synthese von substituierten Perhydro-1,3-thiazin-4-onen und 2-Thioxoperhydro-4-pyrimidinonenDie basisch katalysierte Cyclisierung der N-Propenoylthioharnstoffe 3 liefert je nach den Reaktionsbedingungen entweder 2,6-disubstituierte 2,3,5,6-Tetrahydro-4H-1,3-thiazin-4-one 4 oder 1,6-disubstituierte 2-Thiouracile 5. Unter denselben Reaktionsbedingungen können die Verbindungen 5 durch eine Art Dimroth-Umlagerung aus den 1,3-Thiazin-4-onen 4 erhalten werden.
    Notes: Depending on the reaction conditions either 2,6-disubstituted 2,3,5,6-tetrahydro-4H-1,3-thiazin-4-ones 4 or 1,6-disubstituted 2-thiouracils 5 are readily prepared by base-catalyzed cyclization of N-propenoylthioureas 3. Compounds 5 could also be obtained by Dimroth-type rearrangement of 1,3-thiazin-4-ones 4 under the same reaction conditions.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198819881009
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  • 3
    Electronic Resource
    Electronic Resource
    Studies on the graft copolymerization of methyl methacrylate onto starch (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 708-710 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die durch Cerionen initiierte Pfropfung von Methylmethacrylat auf Stärke wurde untersucht, wobei die nicht absorbierten Cerionen entweder im Substrat blieben oder entfernt wurden. Der Pfropfgrad, die Molekülmasse der gepfropften Ketten und die Anzahl der Pfropfungen wurden in Abhängigkeit von der Konzentration der Cerionen bestimmt. Auf Basis der erhaltenen Ergebnisse wird der Mechanismus der Pfropfreaktion diskutiert.
    Notes: Methyl methacrylate was grafted onto starch by the ceric ion method with and without removing of the unabsorbed ceric ions. Graft level, molecular weight of the grafted chains, and number of the grafted chains were measured in dependence on ceric ion concentration. On base of the results the mechanism of the grafting reaction is discussed.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010401106
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  • 4
    Electronic Resource
    Electronic Resource
    The infrared absorption characteristics of poly(methyl methacrylate) doped with luminescent materials (1987)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 38 (1987), S. 443-446 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Infrarotspektren von Poly(methylmethacrylat)-Probenn die mit verschiedenen lumineszierenden Substanzen dotiert wurden, weisen außer beim β-Naphthol keine wesentlichen Änderungen der Lage und Intensität der Absorptionsbanden auf. Daher wird angenommen, daß zwischen den meisten Dotierungsmitteln und PMMA keine Wechselwirkung besteht, während beim β-Naphthol zwischen benachbarten Molekülen in der Polymermatrix Wasserstoffbindungen auftreten.
    Notes: The infrared spectra of poly(methyl methacrylate) samples doped with different luminescent materials show no drastic changes in the position and intensity of the absorption bands, except in case of β-naphthol. From this it is supposed that there is no interaction between the dopant and PMMA with most of the investigated materials, while with β-naphthol hydrogen bonding between adjacent molecules in the polymer matrix is observed.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1987.010380708
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  • 5
    Electronic Resource
    Electronic Resource
    Physical and spectroscopic studies on methyl methacrylate-chromium acrylate bulk copolymers (1988)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 39 (1988), S. 399-403 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Durch Substanzcopolymerisation von Methylmethacrylat und Chromacrylat wurden neue halbleitende Copolymere erhalten. Das chemische Reaktionsschema wird diskutiert. Dichte und Harte der Proben nehmen mit steigendem Chromgehalt ab. Im Infrarotspektrum wurde eine Verbreiterung der Carbonylbande bei 1 710 cm-1 beobachtet, was auf eine mogliche Koordination der C=O-Gruppe mit Chromionen hinweist. Die elektrische Leitfahigkeit der Proben nimmt mit steigendem Chromacrylatgehalt zu. Der Einfluß einer γ-Bestrahlung auf die elektrische Leitfahigkeit der Copolymere wurde untersucht.
    Notes: New semiconducting copolymers were prepared by bulk copolymerization of methyl methacrylate with chromium acrylate. The pattern of the chemical reactions is discussed. The density and hardness of the samples decrease with increase of the chromium content. I n the infrared spectrum broadening of the carbonyl band a t 1710 cm-l is observed, which indicates the possibility of coordination of the C=O group with the chromium ion. The electrical conductivity of the samples increases with increase of chromium acrylate content. The effect of y-irradiation on the electrical conductivity of the copolymers was studied.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1988.010390718
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  • 6
    Electronic Resource
    Electronic Resource
    Some aspects of graft copolymerization of acrylonitrile onto holocellulose (1989)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 40 (1989), S. 126-128 
    Details
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ein Verfahren zur Pfropfcopolymerisation von Acrylnitril auf gebleichte Holocellulose, wobei die nicht adsorbierten Cerionen aus dem Polymerisationssystem entfernt werden, wird beschrieben. Mit dieser Methode werden höhere Pfropfgrade und höhere Pfropfausbeuten erreicht als bei der kontinuierlichen Initiierung.
    Notes: The graft copolymerization of acrylonitrile onto bleached holocellulose using an initiation procedure in which the unadsorbed ceric ions are removed from the polymerization system is reported. With this method higher graft levels and higher efficiency of grafting is achieved than with the continuous initiation method.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1989.010400212
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  • 7
    Electronic Resource
    Electronic Resource
    Residual porosity in polymeric latex films (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 38 (1989), S. 557-569 
    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: Solubility and diffusivity measurements of a probe gas (CO2), which has an inherently low solubility in the polymer, have been used to characterize residual porosity in polymeric latex films. Sorption isotherms resembling those of a glassy polymer were obtained, even though the glass transition temperature of the polymer was 1°C, about 30°C below the experimental temperature. Solvent cast films of the same polymer exhibited much lower solubilities, and followed the expected Henry's law behavior. CO2 solubility and diffusivity were found to decrease with aging time for the latex films, but did not quite reach the values of the solvent cast films, even after 75 days at room temperature. The sorption data could be described by the dual-mode sorption model, which is commonly employed in the analysis of glassy polymer sorption isotherms. Estimates of the amount of porosity were made from the sorption data, and values ranging from 0.6-0.03% were obtained for latex films aged from 62 h to 75 days, respectively. Our results suggest that permeability differences noted by others for latex and solvent cast films of the same polymer are due to the substantial solubility differences for low-solubility penetrants in these two types of films.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070380315
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  • 8
    Electronic Resource
    Electronic Resource
    Graft copolymerization of acrylonitrile on starch (1989)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Letters Edition 27 (1989), S. 433-436 
    Details
    ISSN: 0887-6258
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1989.140271106
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  • 9
    Electronic Resource
    Electronic Resource
    The theory of gradient elution under hydrostatic equilibrium in liquid chromatography. Part 3: Using solvents of different densities (1986)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 9 (1986), S. 242-247 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, LC ; Gradient elution ; Hydrostatic equilibrium ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Gradient elution under hydrostatic equilibrium is extended to the treatment of the case where the two liquids have different densities. Analytic expressions are derived only for the cases where both mixing chamber and reservoir have constant cross-sectional areas.As in the case where the densities of the liquids are equal, pressigned concentration gradients can be duplicated quite satisfactorily by combining a mixing chamber having a constant cross-sectional area and a reservoir having an area which changes linearly with reservoir height. A numerical example is given to illustrate the use of the derived equations.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240090409
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  • 10
    Electronic Resource
    Electronic Resource
    Linear vs logarithmic retention indices (1988)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 11 (1988), S. 904-906 
    Details
    ISSN: 0935-6304
    Keywords: Linear complementary index ; Logarithmic complementary index ; Kovat's index ; Experimental alpha (αE) ; Ideal alpha (αI) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240111214
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