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  • 1975-1979  (21)
  • 1970-1974  (54)
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  • 1
    Electronic Resource
    Electronic Resource
    Syn selectivity in Diels-Alder reactions of isodicyclopentadiene (1976)
    s.l. : American Chemical Society
    The @journal of organic chemistry 41 (1976), S. 1457-1459 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00870a036
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  • 2
    Electronic Resource
    Electronic Resource
    Role of attractive interactions in endo-exo stereoselectivities of Diels-Alder reactions (1972)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 94 (1972), S. 3633-3635 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00765a066
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  • 3
    Electronic Resource
    Electronic Resource
    Endo selectivities of some methyl-substituted dienophiles in Diels-Alder reactions with cyclopentadiene (1970)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 92 (1970), S. 6548-6553 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00725a028
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  • 4
    Electronic Resource
    Electronic Resource
    Macrocyclic ligands composed of tetrahydrofuran for selective transport of monovalent cations through liquid membranes (1976)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 98 (1976), S. 7414-7419 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00439a050
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  • 5
    Electronic Resource
    Electronic Resource
    13C-NMR spectrum of equibinary (cis-1,4 - 1,2) polybutadieneDedicated to Prof. Dr. ICHIRO SAKURADA on his 70th birthday (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 237-245 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die protonenentkoppelten 13C-Kernresonanzspektren (natürliche Isotopenhäufigkeit) des äquibinären (cis-1,4 - 1,2)-Polybutadiens wurden gemessen. Alle Resonanzen im aliphatischen Bereich wurden zugeordnet; hierbei wurden geschätzte Korrekturterme für die chemischen Verschiebungen im vorliegenden System zusammen mit den GRANTschen Parametern verwendet. Für jeden Peak wurde außerdem angegeben, ob er zu einer Diade oder Triade von cis-1,4- und 1,2-Einheiten gehört. Die gemessenen relativen Intensitäten der Peaks stimmten mit den berechneten Intensitäten überein; der Rechnung wurde eine regellose Verteilung der cis-1,4- und der 1,2-Einheiten zugrunde gelegt. Die gaschromatographische Analyse der Ozonolyseprodukte der Polymere zeigte ebenfalls eine regellose Verteilung der beiden Einheiten an.
    Notes: The proton decoupled natural abundant 13C-NMR spectra of equibinary (cis-1,4 - 1,2)-polybutadiene were measured. Assignments of spectra were made for all peaks of the aliphatic range using chemical shift corrective terms estimated for the present system together with GRANT's parameters. Each peak was interpreted in terms of the diad or triad of cis-1,4 and 1,2 units. The relative intensities of the peaks were in good agreement with the calculated ones from the random assumption with respect to the distribution of cis-1,4 and 1,2 units. The gas-chromatographic analysis of the ozonolysis product of the polymers also showed that the sequence distribution of cis-1,4 and 1,2 units was random.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750125
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  • 6
    Electronic Resource
    Electronic Resource
    Dimerization and polymerization of butadiene with zero-valent nickel and protonic acids (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 174 (1973), S. 65-71 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Verhalten von Hydridonickel-Koordinationsverbindungen als Katalysatoren der Oligomerisation und Polymerisation von Butadien in verschiedenen Lösungsmitteln wurde untersucht. In Gegenwart von Alkohol katalysiert Bis(tricyclohexylphosphin)chlorhydridonickel (4, X = Cl) (HNiCl[P(C6H11)3]2) die lineare Dimerisation. Mit Hydridotetrakis(phosphit)-nickel(1+) (2) ([HNi{P(OR)3}4]+), das durch Reaktion von Tetrakis(phosphit)nickel (1) (Ni[P(OR)3]4) mit Trifluoressigsäure dargestellt wird, erfolgt in sec-Alkohol Dimerisation, nicht dagegen in tert-Alkohol. Das Hauptprodukt ist 2-Methlenvinylcyclopentan (8). Weitere Produkte sind 4-Vinylcyclohexen (10), 1,5-Cyclooctadien (5), 1,3,7-Octatrien (7) und 1,3,6-Octatrien (9). Die mit anorganischen Säuren dargestellte Hydridonickel-Koordinations-verbindung ergibt keine Dimeren, sondern das 1,4-trans-Polymere.
    Notes: The behavior of hydridonickel coordination compounds as catalysts for the oligomerization and polymerization of butadiene in various solvents was studied. In the presence of alcohol bis(tricyclohexylphosphine)chlorohydridonickel (4, X = Cl) (HNiCl[P(C6H11)3]2) catalyzes the linear dimerization. With hydridotetrakis(phosphite)nickel(1+) (2) ([HNi{P(OR)3}4]+), which is prepared from tetrakis(phosphite)nickel (1) (Ni[P(OR)3]4) and trifluoroacetic acid, dimerization occurs in sec-alcohol but there is no reaction in tert-alcohol. The main product is 2-methylenevinylcyclopentane (8). The other products are 4-vinylcyclohexene (10), 1,5-cyclooctadiene (5), 1,3,7-octatriene (7) and 1,3,6-octatriene (9). The hydridonickel coordination compound, prepared with inorganic acids, does not afford the dimers but the 1,4-trans polymer.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021740106
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  • 7
    Electronic Resource
    Electronic Resource
    Polymerization and oligomerization of allenes with N,N′-tetrakis(trimethylsiyl) cobaltdiamine (1973)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 170 (1973), S. 247-249 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1973.021700122
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  • 8
    Electronic Resource
    Electronic Resource
    The dimerization of 1-alkynes by rhodium(I) catalysts. Effect of phosphorus ligands on regioselectivity (1977)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 178 (1977), S. 1077-1087 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The dimerization of 1-alkynes by rhodium(I) complexes in the presence of phosphorus ligands is described. The products are linear and branched dimers, the ratio of which is correlated with the electronic parameters, vCO of Ni(CO)3L, of the ligands L, but no simple correlation is apparent between their steric parameter and the selectivity. Electron-donating ligands promote the formation of the linear dimer. The substituents of the 1-alkynes also affect the distribution of linear and branched dimers. Electron-donating substituents prefer linear isomer to branched one. The reactivity of the substituted 1-alkynes (R—C≡C—H) increased with substituent R in the order \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm H} 〈 {\rm CH}_3 〈 n{\rm - C}_3 {\rm H}_7 〈 n{\rm - C}_4 {\rm H}_9 〈 {\rm CH}_3 {\rm OCH}_2 〈 tert{\rm - C}_4 {\rm H}_9 $$\end{document}
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1977.021780412
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  • 9
    Electronic Resource
    Electronic Resource
    Acetylene-butadiene copolymer for polymer coatings (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 597-609 
    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: Low molecular weight, M̄n 1800-2400, and soluble copolymers of acetylene and butadiene were prepared by nickel naphthenate-diethylaluminum chloride catalyst. These copolymers possess high cure tendency to give insoluble and highly crosslinked films. The curing ability can be controlled by the amount of acetylene content in the copolymer and is in the following order: acetylene-butadiene copolymer 〉 tung oil 〉 cis-1,4-polybutadiene ≫ linseed oil, 1,2-polybutadiene, butadiene-isobutylene copolymer. Chemical modifications of the copolymer such as maleic reaction, metallation by lithium or sodium, graft polymerization by methyl methacrylate, 4-vinylpyridine or vinyl acetate, and epoxidation were also examined. The divinyl methylene in the copolymer gives a high cure tendency and high chemical reactivity.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070210302
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  • 10
    Electronic Resource
    Electronic Resource
    Diethylzine/Nitromethane system as a catalyst for polymerization of olefin oxides (1972)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 155 (1972), S. 185-196 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Nitro-Verbindungen erwiesen sich in Verbindung mit Dialkylzink- oder Trialkylaluminium-Katalysatoren als wirksame Cokatalysatoren für die Polymerisation von Alkylenoxiden wie Äthylenoxid, Propylenoxid, Styroloxid, Allylglycidyläther und Phenylglycidyläther. Das System Dialkylzink/Nitromethan zeigt eine hohe katalytische Aktivität und liefert ein Polymeres mit außerordentlich hoher Viskositätszahl, die z. B. bei Polyäthylenoxid 32 dl/g beträgt. Zur Aktivierung dieses Systems ist eine Wärmebehandlung bei 100°C erforderlich, der entstehende Katalysator ist jedoch temperaturstabil. Während der Wärmebehandlung reagiert Nitromethan mit Diäthylzink unter Entwicklung gasförmigen äthans, Ausbildung einer Zink-Sauerstoff-Bindung und Entstehung von Zinkmethazonat. Gasanalyse, IR- und NMR-spektroskopische Untersuchungen zeigen, daß der Katalysator zusätzlich zu der für die katalytische Aktivität verantwortlichen äthyl-Zink-Bindung eine Zink-Sauerstoff-Bindung besitzt. Der Katalysator ähnelt dem System Diäthylzink/Wasser, besitzt jedoch größere Temperaturstabilität und auf Grund des Fehlens eines beweglichen Wasserstoffs im Cokatalysator eine längere Lebensdauer während der Polymerisation.
    Notes: Nitro-compounds were found to be suitable as cocatalysts for the polymerization of alkylene oxides, such as ethylene oxide, propylene oxide, styrene oxide, allylglycidyl ether, and phenylglycidyl ether when they were used with dialkylzinc or trialkylaluminum catalysts. The nitromethane/diethylzine system exhibits a high catalytic activity to give a polymer of extraordinary high intrinsic viscosity as high as 32 dl/g for ethylene oxide. The system requires heat-treatment at 100°C for activation, but the resulting catalyst is heat-stable. During heat-treatment nitromethane reacts with dialkylzine evolving ethane gas to give a zinc-oxygen linkage together with zinc methazonate. Gas analysis, IR, and NMR studies confirm that the catalyst contains a zinc-oxygen linkage in addition to the ethyl-zinc bond responsible for catalyst activity. The catalyst resembles the diethylzinc/water system, but the catalyst is more heat-stable and has a longer life-time in the polymerization due to the lack of mobile hydrogen in the cocatalyst.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1972.021550117
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