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  • 1
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    Highly oriented block copoly(ether ester) by solid state extrusion (1979)
    Springer
    Details
    Publication Date: 1979-06-01
    Print ISSN: 0170-0839
    Electronic ISSN: 1436-2449
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 2
    Electronic Resource
    Electronic Resource
    Highly oriented block copoly(ether ester) by solid state extrusion (1979)
    Springer
    Polymer bulletin 1 (1979), S. 551-556 
    Details
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Summary A segmented block copoly(ether ester) based on poly(butylene terephthalate) as “hard” segments and on poly(oxytetramethylene) as “soft” segments was highly oriented by cold flow extrusion. Upon further stretching of the high modulus material, the crystallites are tilted by 34∘ with respect to the stretching direction and a four point small angle X-ray pattern is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00254483
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  • 3
    Electronic Resource
    Electronic Resource
    Inhaltsstoffe des Rauschpfeffers, V. 11-Hydroxy-12-methoxy-dihydrokawain und 11.12-Dimethoxydihydrokawain, zwei neue Kawa-Lactone aus Rauschpfeffer (Piper methysticum Forst.) (1972)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 105 (1972), S. 2182-2187 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Constituents of Piper methysticum Forst., V. 11-Hydroxy-12-methoxydihydrokawain and 11.12-Dimethoxydihydrokawain, two new Kawa-Lactones from Piper methysticum Forst.Chromatographic separation of the methanolic extract from kawa-roots yielded two new lactones, which were shown to have the structures 1 and 2.
    Notes: Die chromatographische Untersuchung des methanolischen Extraktes der Kawa-Wurzel führte zur Isolierung der neuen Kawa-Lactone 1 und 2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19721050711
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  • 4
    Electronic Resource
    Electronic Resource
    Kinetik der Schutzgruppenabspaltung an Nucleosiden mittels 1H-NMR-Spektroskopie (1974)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 107 (1974), S. 611-615 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Hydrolysis Kinetics of Nucleoside Protective Groups Using 1H-N.M.R. SpectroscopyThe chemical shift of the proton 6-H of pyrimidine nucleoside bases in unprotected nucleosides is different from that in 3′ or 5′ protected nucleosides. By integrating both peaks repeatedly, as a function of time, concentration, and pH value, accurate kinetic data could, for the first time, be obtained.-Improved and, in some cases, new procedures for preparation of tritylated pyrimidine nucleosides are described.
    Notes: Die Lage des Basenprotons 6-H im 1H-NMR-Spektrum von Pyrimidin-Nucleosiden ist beim ungeschützten Nucleosid verschieden von derjenigen eines in 3′- oder 5′-Stellung geschützten Nucleosids. Durch Integration beider Peaks in Abhängigkeit von Zeit, Konzentration und pH-wert konnte erstmals eine quantitative Hydrolysekinetik durchgeführt werden.-Verbesserte und z. T. neue Vorschriften zur Darstellung von tritylierten Pyrimidin-Nucleosiden werden beschrieben.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19741070230
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  • 5
    Electronic Resource
    Electronic Resource
    Untersuchungen an Stoffwechselprodukten von Mikroorganismen, IX. Notiz zur Struktur des Tylosins (1975)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 108 (1975), S. 2481-2483 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19751080737
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  • 6
    Electronic Resource
    Electronic Resource
    Reaktionen mit Silylaziden, 4. Über Cyclopropylisocyanate (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 3753-3764 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions with Silyl Azides, 4. Cyclopropyl IsocyanatesCyclopropanecarbonyl chloride reacts with diphenyldiazidosilane (1) to yield cyclopropyl isocyanate (3), and 1,2-cyclopropanedicarboxylic anhydride (8) reacts with trimethylsilyl azide (10) to give trimethylsilyl 2-isocyanato-1-cyclopropanecarboxylate (11). In an analogous way, but with pyridine as catalyst, trimethylsilyl cis-2-isocyanato-1,2-dimethyl-1-cyclopropanecarboxylate (12) is formed. 12 is much less stable, in chemical and thermal sense, than compound 11. Thus pyridine induces decarboxylation and ring expansion with formation of 3,5-dimethyl-2-(trimethylsilyloxy)pyrrole (15), which in turn is reversibly isomerized to 3-5-dimethyl-1-trimethylsilyl-3-pyrrolin-2-one (16).
    Notes: Die Umsetzung von Cyclopropancarbonylchlorid mit Diphenyldiazidosilan (1) führt zu Cyclopropylisocyanat (3) und die Umsetzung von 1,2-Cyclopropandicarbonsäure-anhydrid (8) mit Trimethylsilylazid (10) zu 2-Isocyanato-1-cyclopropancarbonsäure-trimethylsilylester(11). Auf analoge Weise, jedoch nur unter Katalyse von Pyridin, entsteht auch der cis-2-Iso-cyanato-1,2-dimethyl-l-cyclopropancarbonsäure-trimethylsilylester (12), der chemisch und thermisch wesentlich weniger stabil ist als 11. So bewirkt Pyridin Decarboxylierung und Ringerweiterung zum 3,5-Dimethyl-2-(trimethylsilyloxy)pyrrol (15), das seinerseits reversibel zu 3,5-Dimethyl-1-trimethylsilyl-3-pyrrolin-2-on (16) isomerisiert wird.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731061134
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  • 7
    Electronic Resource
    Electronic Resource
    Inhaltsstoffe des Rauschpfeffers, VI. Kernresonanzspektroskopische Untersuchungen an Kawa-Lactonen (1973)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 106 (1973), S. 2648-2653 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Constituents of Piper methysticum Forst., VI. H N.M.R. Studies on Kawa-LactonesThe 1H n.m.r. spectra of kawa-lactones were analysed on the basis of their known structures. The equatorial position of the large substituent at C-6 - so far assumed from steric considerations - is corroborated for all partially saturated kawa-lactones 2 and 3. Furthermore it is concluded from the n.m.r. data that free rotation of the aryl-ethyl-side chain at C-6 is hindered in compounds 3.
    Notes: Die Analyse der 1H-NMR-Spektren der bekannten Kawa-Lactone ermöglicht eine eindeutige Zuordnung aller Signale. Für partiell gesättigte Kawa-Lactone vom Typ 2 und 3 wird die bisher nur angenommene äquatoriale Stellung des Substituenten am C-6 bestätigt. Wie die 1H-NMR-Daten zeigen, ist bei Verbindungen vom Dihydrokawain-Typ (3) die freie Drehbarkeit der Aryläthyl-Seitenkette am C-6 eingeschränkt.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19731060829
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  • 8
    Electronic Resource
    Electronic Resource
    Copolymer statistics during esterification of syndiotactic poly(methacrylic acid) with diazomethane (1974)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 175 (1974), S. 523-534 
    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: Nicht-neutralisierte und neutralisierte, syndiotaktische Poly(methacrylsäure) wird mit Diazomethan partiell verestert. Umsatz und Triadenverteilung der entstenhenden cosyndiotaktischen Methylmethacrylat-Methacrylsäure-Copolymeren und deren Fraktionen werden durch 1H-NMR-Spektroskopie bestimmt. Nicht-neutralisierte Poly(methacrylsäure) ergibt Copolymere, die in bezug auf den Umsatz heterogen sind; ihre Fraktionen zeigen näherungsweise eine BERNOULLI-Verteilung der Triaden. Neutralisierte Poly(methacrylsäure) liefert hingegen homogene Copolymere mit einer innerhalb der Meßgenauigkeit liegenden BERNOULLI-Verteilung der Triaden. Ein kinetischer Nachbargruppeneffekt tritt daher bei der Veresterung mit Diazomethan nicht auf. So hergestellte Copolymere weisen eine einfache konfigurative und kompositive Statistik auf, wie sie durch Copolymerisation der Monomeren bislang nicht hergestellt werden kann. Der Polyelektrolytcharakter der Copolymeren kann durch anschließende, vollständige Veresterung mit einem zweiten Diazoalkan eliminiert werden; die Statistik der so entstehendenen Copolymeren ist mit der der ursprünglichen Copolymeren identisch.
    Notes: Syndiotactic poly(methacrylic acid) is partially esterified as such or in its neutralized form with diazomethane. The extent of reaction and the triad distribution of the resulting cosyndiotactic methyl methacrylate-methacrylic acid copolymers and their fractions are determined by 1H-NMR spectroscopy. Unneutralized poly(methacrylic acid) yields copolymers which are heterogeneous with respect to conversion, the fractions of the copolymers possessing an approximate BERNOULLIan triad distribution. Neutralized poly(methacrylic acid) results in homogeneous copolymers whose triad distribution is BERNOULLIan within accuracy of measurement. A kinetic neighboring group effect is therefore not operative during the esterification with diazomethane. Copolymers may thus be prepared which are of simple configurational and compositional statistics, not obtainable at present by copolymerization of monomers. The polyelectrolyte character of the copolymers may be eliminated by consecutive, complete esterification with a second diazoalkane, the statistics of the derived copolymers being identical with that of the precursor copolymers.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1974.021750215
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  • 9
    Electronic Resource
    Electronic Resource
    Elektron-Donor-Akzeptor-Komplexe und copolymere mit difluormaleinsäureanhydridAuszugsweise vorgetragen auf dem Makromolekularen Kolloquium, Freiburg, März 19781. (1980)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 181 (1980), S. 1703-1715 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The formation constants of electron donor acceptor complexes formed by p-dioxene, α-methylstyrene, phenanthrene, phenyl vinyl ether and styrene as donor molecules and difluoromaleic anhydride as acceptor are much larger compared to those formed by maleic anhydride and the same donor molecules. However, no relation can be established between the numerical value of the formation constant and the tendency of alternating copolymerization induced by radical initiators. Symmetry considerations lead to the conclusion that electron donor acceptor complexes have no significant involvement in this copolymerization. The result of our kinetic investigations in the system phenyl vinyl ether/difluoromaleic anhydride supports the above statement: The formation of the electron donor acceptor complex is not the rate determining step of copolymerization.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1980.021810813
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  • 10
    Electronic Resource
    Electronic Resource
    Poly(maleic anhydride)  -  synthesis and proof of structurePresented in part at Makromol. Kolloquium, Freiburg 1980 and IUPAC, Int. Symp. on Macromolecules, Florence, 1980. (1981)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 182 (1981), S. 237-242 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1981.021820127
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