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  • 1
    Electronic Resource
    Electronic Resource
    Substituenteneinfluß auf sigmatrope Reaktionen, II. 13C-DNMR-Untersuchungen zur Kinetik der Valenz-isomerisierung von 3,4-Homotropiliden und seines 3-Methylderivates (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 3151-3158 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Influence of Substituents on Sigmatropic Reactions, II. 13C D. N.M.R. Investigations Concerning the Kinetics of the Valence Isomerization of 3,4-Homotropilidene and its 3-Methyl DerivativeThe barrier of the degenerated valence isomerization in 3,4-homotropilidene (1) was determined by complete line shape analysis of the 13C d.n.m.r. spectra. The values (Ea = 13.03 ± 0.10 kcal/mole, log A = 11.99 ± 0.06, ΔH≠ = 12.34 ± 0.09 kcal/mole, ΔS≠ = -5.9 ± 0.6 Clausis und Δ298≠ = 14.1 ± 0.2 kcal/mole) are in good agreement with the results of the 1H d.n.m.r. line shape analysis of the octadeuterio derivative 2. The influence of a methyl group in 1- or 3-position is small (ΔG298≠ = 13.8 bzw. 14.9 kcal/mole).
    Notes: Die Barriere der degenerierten Valenzisomerisierung in 3,4-Homotropiliden (1) wurde durch Linien-formanalyse der 13C-DNMR-Spektren bestimmt. Die Daten (Ea = 13.03 ± 0.10 kcal/mol, log A = 11.99 ± 0.06, ΔH≠ = 12.34 ± 0.09 kcal/mol, ΔS≠ = -5.9 ± 0.6 Clausius und ΔG298≠ = 14.1 ± 0.2 kcal/mol) stehen in guter Übereinstimmung mit den Ergebnissen der Linieformanalyse des 1H-NMR-Spektrums des Octadeuterioderivates 2. Der Einfluß einer Methylgruppe in 1-bzw. 3-Stellung auf die Barriere ist klein (ΔG298≠ = 13.8 bzw. 14.9 kcal/mol).
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751081006
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  • 2
    Electronic Resource
    Electronic Resource
    Zerstörungsfreie Messung der Einzeldicken von Schichtsystemen nach dem Wirbelstrom-Verfahren (1975)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 6 (1975), S. 188-194 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Nondestructive Measurement of Thicknesses of a Multi-Layer-Coating System by the Eddy Current Method.The paper describes the theory and the practical application of an eddy current method for nondestructive measuring of thicknesses of a multi-layer-coating system. Evaluation diagrams with examples for some practical measurements are indicated.
    Notes: Die Arbeit beschreibt die theoretische, meßtechnische und gerätetechnische Seite eines Wirbelstromverfahrens zur zerstörungsfreien Schichtdickenmessung an Schichtsystemen. Es werden Beispiele für Auswertediagramme mit Meßbeispielen angegeben und quantitativ bewertet.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19750060603
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  • 3
    Electronic Resource
    Electronic Resource
    Struktur und Eigenschaften von ABS-Polymeren, 13. Einfluß der Polymerisationsbedingungen auf die Struktur von ABS-Polymeren bei der Pfropfung in Emulsion (1977)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 58 (1977), S. 213-226 
    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: By grafting styrene-acrylonitrile onto poly(butadiene) latex graft polymers of different structure are synthesized. During the graft reaction the monomer to poly(butadiene) ratio and the conversion were varied and the influence of these variations on the degree of grafting and the molecular weight of grafted chains was studied. By mixing these graft polymers of different graft structure (graft density) with styrene-acrylonitrile-copolymers, ABS-materials are formed with a rubber content of 17.5% by weight.Glass transition temperature (Tg) of the elastomer phase of these ABS materials as well as notched impact values correlate with graft density of the rubber component.
    Notes: Durch Pfropfung von Styrol-Acrylnitril auf Polybutadien in Emulsion werden Pfropfpolymerisate unterschiedlicher Pfropfstruktur hergestellt. Es wird der Einfluß des Verhältnisses von Monomerem zu Polybutadien auf die Geschwindigkeit der Pfropfreaktion, auf den Pfropfgrad und die Molekulargewichte und der des Umsatzes auf die Molekulargewichte und den Pfropfgrad der Pfropfpolymerisate untersucht.An Hand von Messungen der Glasübergangstemperatur der Kautschukphasen in ABS-Materialien, die aus den so hergestellten Pfropfpolymerisaten erhalten wurden, und an Hand von Messungen der Kerbschlagzähigkeit werden die Bedeutung der Struktur der Pfropfhülle für die Eigenschaften von ABS-Polymerisaten diskutiert.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1977.050580109
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  • 4
    Electronic Resource
    Electronic Resource
    Einfluß der thermischen Vorgeschichte auf die Enthalpie von PMMAHerrn Prof. Dr. Dr. h. c. Heinrich Hellmann zum 65. Geburtstag gewidmet (1978)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 74 (1978), S. 317-322 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1978.050740120
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  • 5
    Electronic Resource
    Electronic Resource
    Structure and properties of abs polymers. X. Influence of particle size and graft structure on loss modulus temperature dependence and deformation behaviorPresented at IUPAC Symposium, Madrid, Spain, 1974. (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 2691-2704 
    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: ABS systems which differ distinctly in particle size and degree of grafting were prepared and investigated by dynamic mechanical measurements as function of temperature in the glass transition region of the rubber phase. Variation of rubber content within different sample series results in effects which were mainly referred to thermal stresses as consequence of phase interactions. Basic aspects of the deformation behavior of some of these ABS systems are studied by mechanical and morphological methods, and the operation modes of the component of a bimodal/bigraft-system concerning toughness are discussed.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070201007
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  • 6
    Electronic Resource
    Electronic Resource
    Chemical Selectivities Disguised by Mass Diffusion I. A simple model of mixing-disguised reactions in solution. 1st communication on the selectivity of chemical processes (1975)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 58 (1975), S. 2074-2093 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The influence of mass diffusion on substrate and positional selectivities is discussed. A simple model is developed which allows a description and simulation of the coupling of the mass diffusion with the chemical reaction during the mixing process of two reactant solutions. For competitive, consecutive reactions and competitive, parallel reactions the general behaviour and the dependence of the product selectivity on diffusion effects is demonstrated.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19750580722
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  • 7
    Electronic Resource
    Electronic Resource
    Chemical selectivities disguised by mass diffusion. III. A comparison of two versions of a simple model of mixing-disguised reactions in solutionPart III and 3rd Communication cf. [2].. 3rd communication on the selectivity of chemical processesZum ehrenden Andenken an Prof. Dr. H. Hopff (1977)
    New York, NY : Wiley-Blackwell
    Helvetica Chimica Acta 60 (1977), S. 2926-2937 
    Details
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A simple mixing-reaction model has been developed [1] which allows a description and simulation of the coupling of the mass diffusion with the chemical reaction during the mixing process of two miscible reactant solutions. For competitive, consecutive as well as for competitive, parallel second-order reactions the general behaviour and the dependence of the product distribution on diffusion effects are calculated for semi-continuous reaction conditions using various simplifying assumptions. The usefulness of these assumptions is discussed with reference to the calculated predictions of two versions of the mixing-reaction model.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hlca.19770600845
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  • 8
    Electronic Resource
    Electronic Resource
    Simulation und Optimierung einer kompetitiven Diffusions-Immobilisierungs-Kinetik in porösen Substraten (1979)
    Weinheim : Wiley-Blackwell
    Chemie Ingenieur Technik - CIT 51 (1979), S. 982-983 
    Details
    ISSN: 0009-286X
    Keywords: Modellentwicklung ; math. Modell ; Simulation ; Optimierung ; Parameter-Identifikation ; Diffusion ; Immobilisierung ; kompetitive Kinetik ; Sorptionsprozeß ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cite.330511014
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesen von Heterocyclen, CXCVI. Reaktionen mit cyclischen Oxalylverbindungen, XVIII. Zur Reaktion von heterocyclischen Fünfring-2,3-dionen mit Phenylisocyanid (1976)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1976 (1976), S. 2071-2082 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Heterocyclic Compounds, CXCV. - Reactions of Cyclic Oxalyl Compounds,XVII . - Reaction of Heterocyclic Five-Membered Ring 2,3-Diones with Phenyl IsocyanideThe reaction of phenyl isocyanide with l-aryl-4-benzoyl-5-phenyl-2,3-dihydropyrrole-2,3-diones 1 (molar ratio 1 : 1) yields the 1 -oxa-5-azaspiro[2.4]heptan-4-ones 2. 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dione (10) reacts with phenyl isocyanide (molar ratio 1 : 1) undergoing ring expansion to give the pyran-2,4-dione derivative 11. The structures of 2 and 11 are confirmed by further spectroscopic and chemical investigations.
    Notes: Phenylisocyanid reagiert im Molverhältnis 1 : 1 mit 1-Aryl-4-benzoyl-5-phenyl-2,3-dihydro-pyrrol-2,3-dionen 1 zu den l-Oxa-5-azaspiro[2.4]heptan-4-onen 2, mit 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dion (10) entsteht das ringerweiterte Pyran-2,4-dion-Derivat 11. Die Ergebnisse der spektroskopischen Untersuchungen einerseits sowie chemische Folgereaktionen andererseits werden als Strukturbeweise für 2 bzw. 11 geltend gemacht.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197619761114
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  • 10
    Electronic Resource
    Electronic Resource
    Synthesen von Heterocyclen, CCV. Reaktionen mit cyclischen Oxalylverbindungen, XX Reaktionen von 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dion mit aliphatischen Nitrilen (1977)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1977 (1977), S. 1751-1757 
    Details
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Syntheses of Heterocyclic Compounds, CCV. - Reactions of Cyclic Oxalyl Compounds, XX. - Reactions of 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dione with Aliphatic NitrilesThe reaction of 4-benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dione (1) with butyro-. isobutyro-, and phenylacetonitrile under thermolysis conditions leads via the dibenzoylketene-intermediate 2 to the 2-alkyl-5-benzoyl-6-phenyl-1,3-oxazin-4-ones 3, which can be converted by hydrolysis into the N-acylacrylamides 4. 2-Benzoyl-3-phenyl-5,6-dihydro-1 H-pyrano[2,3-c]isoquinoline-1,6-dione (5) is formed as a by-product in the reaction of 1 and phenylacetolnitrile. The structure of 5 is confirmed by alkylation and oxidation reactions.
    Notes: 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dion (1) reagiert mit Butyro-, Isobutyro- und Phenylacetonitril unter Thermolysebedingungen über die Dibenzoylketen-Zwischenstufe 2 zu den 2-Alkyl-5-benzoyl-6-phenyl-1,3-oxazin-4-onen 3, die sich zu den N-Acylacrylsäureamiden 4 hydrolysieren lassen. Aus 1 und Phenylactonitril entsteht als Nebenprodukt 2-Benzoyl-3-phenyl-5,6-dihydro-1 H-pyrano[2,3-c]isochinolin-1,6-dion (5), dessen Struktur durch Alkylierung sowie Oxidation mit KMnO4 gesichert wurde.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.197719771022
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