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  • Chemistry  (38)
  • Analytical Chemistry and Spectroscopy  (9)
  • LSU  (8)
  • 1
    Electronic Resource
    Electronic Resource
    Cycloaddition of Carbodiimides with a Heteroaromatic Substituent to Allenic Acids (1992)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 75 (1992), S. 1262-1266 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cycloaddition of the allenic acid 3 with the N -cyclohexyl-N′ -heteroaromatic carbodiimides 2a and 2b gave the isomeric pyrido[1,2-a]pyrimidinones 4 and 5 and thiazolo[3,2-a]pyrimidinones 6 and 7, respectively, instead of the expected Diels-Alder adducts analogous to 1. The compounds of the latter type, i.e. 8 and 9, were formed from 3 and carbodiimides 2c and 2d, respectively, containing an N′-(pyrazin-2-yl) or N′-(pyrimidin-2-yl) substituent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19920750426
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  • 2
    Electronic Resource
    Electronic Resource
    New Polycyclic Compounds from Photochemical Rearrangements of Some Substituted 2-Azatricyclo[5.2.2.01,5]undeca-4,8,10-trien-3-ones (1991)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 74 (1991), S. 1011-1026 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The products formed on UV irradiation of several tricyclic compounds (i.e. 3, 6, 8, 15, and 17, Schemes 2-4) were studied in detail. A marked dependence of the reaction course on the type and site of substitution was found. Among the several light-induced transformations, a novel rearrangement, i.e. 11 to 9 (Scheme 3) was identified. The formation of the polycyclic compound 13 on irradiation of 8a (Scheme 3) resulted from an unexpected skeletal rearrangement with dearomatization of one benzene ring. The structures of compounds 10, 11, and 13 were established by X-ray crystallography (Figs. 1-3). An attempt was made to give a general mechanistic picture of all observed photochemical results (Schemes 4-6).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19910740512
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  • 3
    Electronic Resource
    Electronic Resource
    A Regiospecific Photochemical Rearrangement of 2-Azabenzotricyclo[5.2.2.01,5]- to 2-Azabenzotricyclo[6.2.1.01,5]undecatrienone (1989)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 72 (1989), S. 502-506 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 2-azatricyclo[5.2.2.01,5]undeca-4,8,10-trien-3-ones 1a and 1b gave on irradiation the 2-azatricyclo-[6.2.1.01,5]undeca-4,6,9-trien-3-ones 2a and 2b, respectively. The rearrangement was found to be solvent-, oxygen-, and wavelength-independant.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19890720313
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  • 4
    Electronic Resource
    Electronic Resource
    Star-graft copolymers. Synthesis of amphiphilic graft copolymers with star-branched poly(oxyethylene) side chains (1997)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 35 (1997), S. 673-679 
    Details
    ISSN: 0887-624X
    Keywords: star-graft copolymers ; amphiphilic copolymers ; poly(oxyethylene) ; activated esters ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The synthesis of novel amphiphilic star-graft (SG) copolymers containing hydrophilic poly(oxyethylene) (PEO) side chains attached to a hydrophobic backbone by multifunctional entity is reported. In a first step poly(phthalimidoacrylate-co-styrene) was converted into polymers containing different number of multifunctional branching cites distributed along the main chain by partial aminolysis of the phthalimidoacrylate units with tris(hydroxymethyl)aminomethane. In the second step, these reactive copolymers yielded SG copolymers with different number of star-shaped PEO side groups by reaction with isocyanato terminated methoxy-PEO. The copolymers were characterized by size-exclusion chromatography, IR-, and NMR-spectroscopy. Their thermal properties were examined by thermal gravimetric analysis and differential scanning calorimetry. The studies indicate that the grafting degree and hydrogen bonding determine to a great extent the behavior of the SG copolymers in solid state and in solution. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 673-679, 1997
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Substituted Tungsten Fluorides (1999)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 1999 (1999), S. 95-99 
    Details
    ISSN: 1434-1948
    Keywords: Tungsten ; Fluorine ; 2,2,2-Trifluoroethoxy ; Bis(2,2,2-trifluoroethyl)amino ; Aza-tungsta-cyclopropane ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: WF6 reacts with HOCH2CF3 to form F5W-OCH2CF3 and cis-WF4(OCH2CF3)2. CsF is added to F5WOCH2CF3, yielding the heptacoordinated anion [F6WOCH2CF3]-, which has a capped octahedral structure with the oxygen ligand in an equatorial position. The first step of the reaction of WF6 with HN(CH2CF3)2 results in F5WN(CH2CF3)2. Excess HN(CH2CF3)2 causes deprotonation, yielding the heptacoordinated [F5W(η2CF3-CHN-CH2CF3)]- anion. This can be described as a tungstaazacyclopropane derivative or a π complex between F5W- and CF3-CHN-CH2CF3. The only case in which MoF6 reacts similarly is the formation of F5Mo-OCH2CF3.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Untersuchung des einflusses einiger retarder auf die pyrolysegeschwindigkeit von polyäthylenterephthalat mit hilfe der differential-thermischen und thermogravimetrischen analyse (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 80 (1979), S. 161-170 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The change of the decomposition rate of polyethylenterephthalat-samples with different retardants has been studied using DTA and TGA. The influence of the applied additives on the thermal stability of the polymers has been determined. The influence of flame retardants on the pyrolysis processes taking part in the solid phase has been investigated.
    Notes: Mittels DTA und TGA wurde die Abhängigkeit der Zersetzungsgeschwindigkeit von Polyäthylenterephthalatproben mit verschiedenen Retardern untersucht. Der Einfluß der Zusätze auf die thermische Stabilität der Polymeren wurde bestimmt. Weiterhin wurde der Einfluß der flammhemmenden Zusätze auf die in fester Phase ablaufenden Pyrolyseprozesse ermittelt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050800113
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  • 7
    Electronic Resource
    Electronic Resource
    Microstructure and relaxation properties of PVC-based two-component polymer systems (1982)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 106 (1982), S. 91-106 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Phasenstruktur von Zweikomponenten-Polymer-Systemen auf PVC-Basis (PVC mit PVCA, PMMA, CPE und PIB) wurde mit Phasenkontrast-Mikroskopie sowie dielektrischer und thermomechanischer Spektroskopie untersucht. Die Größe und Verteilung der Phasen wurden mit den Relaxations-Eigenschaften und der mechanischen Festigkeit verglichen. Es wurde gefunden, daß die Zweikomponenten-Polymer-Mischungen auf PVC-Basis in vier Hauptgruppen eingeteilt werden können: Mikroskopisch homogene, mikroskopisch heterogene, Mischungen mit begrenzter Verträglichkeit und makroskopisch heterogene Systeme.
    Notes: The phase-structure of PVC-based two-component polymer systems (PVC with PVCA, PMMA, CPE and PIB) was studied by phase-contrast microscopy, dielectric and thermomechanical spectroscopy. The size and distribution of the phases were related to the relaxation properties and mechanical strength. It was found that the PVC-based two-component polymer compounds can be characterized into four main groups which are: Microscopically homogeneous, microscopically heterogeneous, compounds with compatibility limit and macroscopically heterogeneous systems.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1982.051060108
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  • 8
    Electronic Resource
    Electronic Resource
    Differentialthermoanalytische Untersuchungen zur effektivität einiger Stabilisatoren bei Polyäthylenterephthalat (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 64 (1977), S. 75-80 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The thermooxidative resistance of poly(ethylene terephthalate), synthesized in the presence of different stabilizers as well as combinations of stabilizers as well as combinations of stabilizers, is studied with the help of the dynamic and isothermal DTA-method. The stabilization coefficients (by the dynamic DTA) and the characteristic induction periods (by the isothermal DTA) are determined. A good correlation is established between the data obtained by both methods.
    Notes: Mit Hilfe der dynamischen und isothermen DTA-Methode wurde die Thermooxidationsbeständigkeit von Polyäthlenterephthalat (PETP), synthetisiert in Anwesenheit verschiendener Stabilisatoren sowie Kombinationen aus Stabilisatoren, untersucht. Es wurden die Werte der Stabilitätskoeffizienten (nach der dynamischen DTA-Methode) und der charakteristischen Induktionsperioden (nach der isothermen DTA) bestimmt. Zwischen den nach beiden Methoden erhaltenen Daten wurde eine gute Korrelation festgestellt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050640106
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  • 9
    Electronic Resource
    Electronic Resource
    Modelluntersuchungen zur Wirkungsweise von Oxidationsstabilisatoren für Polyäthylenterephthalat (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 64 (1977), S. 81-88 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The behaviour of some stabilizing additives to poly(ethylene terephthalate) (PETP) is studied in the model oxidation reaction of isopropylbenzene. On the basis of the course of accumulation curves for cumene hydroperoxide conclusions were drawn for the way of formation and consumption of hydroperoxides in the presence of different types of stabilizers and combinations of stabilizers under investigation.
    Notes: Es wurde das Verhalten einiger stabilisierender Zusätze für Polyäthylenterephthalat (PETP) in der Oxidation von Isopropylbensol als Modellreaktion untersucht. Aus dem Verlauf von Kurven für die Cumolhydroperoxidkonzentration wurden Schlußfolgeungen über die Art der Bildung und des Verbrauchs der Hydropeoxide in Anwesenheit von verschiedenen Stabilisatortypen sowie von Kombinationen aus Stabilisatoren gezogen.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050640107
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  • 10
    Electronic Resource
    Electronic Resource
    Die mechanisch-chemische degradation von polymeren bei der verarbeitungstemperatur (1969)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 9 (1969), S. 111-121 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: There is a number of questions that remains unanswered by the literature regarding mechano-chemical degradation of plastics at the temperatures of processing. The investigations described here were carried out to determine the degree to which different polymers are degraded at the temperatures of processing under the influence of mechanical forces and to determine the relationship between melt viscosity and degree of degradation, as well as to understand the mechanism and the kinetics of degradation.
    Notes: Das Schrifttum bezüglich der bei Verarbeitungstemperaturen auftretenden mechanisch-chemischen Degradation von Kunststoffen gibt auf zahlreiche Fragen keine Antwort. Die hier beschriebenen Untersuchungen dienten zur Feststellung, in welchem Maße verschiedene Polymere bei der Verarbeitungstemperatur unter dem Einfluß mechanischer Kräfte abgebaut werden, welcher Zusammenhang zwischen der Schmelzviskosität und dem Maß der Degradation festzustellen ist und welchen Charakter der Mechanismus und die Kinetik der Degradation aufweisen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1969.050090110
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