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  • 1
    Electronic Resource
    Electronic Resource
    Conformational properties of gastrin peptides: Synthesis, biological activity, and preliminary CD characterization of the (Asp)5 analog of des-Trp1, Leu12-minigastrin (1986)
    New York : Wiley-Blackwell
    Biopolymers 25 (1986), S. 229-234 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.360250204
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  • 2
    Electronic Resource
    Electronic Resource
    α-Ketoimidgruppierungen als eine der ursachen für die lumineszenz thermooxidativ geschädigten polycaprolactams (1979)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 79 (1979), S. 193-206 
    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 present paper is concerned with the origin of luminescence in thermo-oxidativ damaged polycaprolactame. It is demonstrated that the luminescence of a substance isolated from the damaged polycaprolactame is caused by an α-ketoimid-structure element linked as a lumophoric group to the backbone of the polymer. A mechanism for the oxidation leading to this structure element is discussed on basis of the caprolactame oxidation.
    Notes: Die vorliegende Arbeit beschäftigt sich mit den Ursachen der Lumineszenz in thermooxidativ geschädigtem Polycaprolactam. Es wird gezeigt, daß die Lumineszenz einer Substanz, die aus geschadigtem Polycaprolactam isoliert werden konnte, durch a-Ketoimidgruppierungen hervorgerufen wird, die im ‚backbone‘ des Polymeren als lumophore Gruppen eingebaut sind. Ein Mechanismus für die Oxidationsreaktion, die zu dieser Struktur führt, wird anhand der Oxidation des Caprolactams diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1979.050790117
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  • 3
    Electronic Resource
    Electronic Resource
    First stereoselective synthesis of (1S,2S,4R,5R)-(-)-β-multistriatin (1995)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1995 (1995), S. 1011-1014 
    Details
    ISSN: 0947-3440
    Keywords: Multistriatin ; 2,3-O-(3-Pentylidene)-D-glyceraldehyde ; Wittig Olefination, cis-selective ; Michael reaction, diastereoselective ; Hydrogenation, diastereoselective ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Starting from 2,3-O-(3-pentylidene)-D-glyceraldehyde (3), we prepared the bicyclic pheromone (1S,2S,4R,5R)-(-)-β-multistriatin (1) on a gram scale. Key steps of the synthesis are a cis-selective Wittig olefination followed by diastereo-selective Michael addition and hydrogenation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1995199506143
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  • 4
    Electronic Resource
    Electronic Resource
    Corrosion of a new copper—gold or copper—platinum intrauterine device (1982)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Biomedical Materials Research 16 (1982), S. 785-798 
    Details
    ISSN: 0021-9304
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine , Technology
    Notes: It has been shown previously that supplementing plastic intrauterine devices (IUDs) with copper wire enhances the antifertility effect of the device. The use of copper intrauterine contraceptive devices, however, is currently limited to two to three years, mainly because of wire fragmentation, which was observed as early as after eight months of use. In the resulting search for a long-lasting device, two new systems of duplex wire, with gold and platinum cores electrolytically coated with copper, were devised and studied. Initially, duplex wires and controls were exposed to physiological solution. Copper dissolution rate and corrosion morphology were studied by weight-loss measurements and optical metallography. Similar systems were then surgically implanted in rat uteri for varying periods of up to 26 weeks. Electron micro-analysis of corrosion products, in addition to weight-loss measurements and metallography, was performed. The results showed that a uniform and ductile copper coating is obtainable by electroplating on gold and platinum wires. Rate of copper dissolution is similar to that of solid copper wire. No dissolution of gold and platinum in the controls or coated wires was detected by weight loss, metallography, or atomic absorption measurements. Microanalysis of the deposits and corrosion products on the wires in the uteri environment showed sulfur, chlorine, and calcium, in addition to copper. The results of this study suggest that supplementing IUDs with copper-coated gold or platinum wires may result in significant prolongation of the life span of the device by preventing uncontrolled loss of copper caused by wire fragmentation.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jbm.820160605
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  • 5
    Electronic Resource
    Electronic Resource
    Zur Problematik der Einteilung von Diels-Alder-Reaktionen in „normale“ und „inverse“Herrn Professor Dr. Rolf Huisgen zu seinem 60. Geburtstag in Verehrung gewidmet. (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 306-311 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Difficulty of Classifying Diels-Alder-Reactions into “Normal” and “Inverse”The reactivity of the investigated cyclic dienophiles with 9,10-dimethylanthracene (7) decreases in the order maleic anhydride (1), maleic thioanhydride (2), and maleic imide (3). An analogous behaviour is equally found for the derivatives 4-6 which are dichlorinated at the double bond. In both series this can be understood with the model of the frontier orbitals only if besides the energies of these orbitals, the differing frontier orbital densities of the dienophiles and the electrophilicity of the diene are also taken into account.
    Notes: Die Reaktivität der untersuchten cyclischen Dienophile gegenüber 9,10-Dimethylanthracen (7) nimmt in der Reihenfolge Maleinsäureanhydrid (1), Maleinsäurethioanhydrid (2) und Maleinsäureimid (3) ab. Ein analoges Verhalten findet man auch für die an der Doppelbindung dichlorierten Derivate 4-6. Innerhalb jeder der beiden Reihen kann dies mit Hilfe des Grenzorbitalmodells nur dann verstanden werden, wenn neben der energetischen Lage der Grenzorbitale auch die unterschiedlichen Grenzorbitaldichten der Dienophile und die Elektrophilie des Diens berücksichtigt werden.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810214
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  • 6
    Electronic Resource
    Electronic Resource
    Fragmentierung cyclischer Carboxonium-Ionen, IV Synthese von β-Oxa-γ,δ-enonen (1981)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1981 (1981), S. 1105-1117 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Fragmentation of Cyclic Carboxonium Ions, IV.  -  Synthesis of β-Oxa-γ,δ-enonesThe proton-catalyzed fragmentation of 4-methylene-1,3-dioxolanes 2 by weak acids (pK 〉 4.3) or weak acidic ion exchangers leads in good yields to β-oxa-γ,δ-enones 5 which are thus easily and generally available for the first time.
    Notes: Die protonenkatalysierte Fragmentierung der 4-Methylen-1,3-dioxolane 2 mit schwachen Säuren (pK 〉 4.3) oder mit schwach sauren Ionenaustauschern führt in guten Ausbeuten zu den β-Oxa-γ,δ-enonen 5, die damit erstmals einfach und allgemein zugänglich werden.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198119810616
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  • 7
    Electronic Resource
    Electronic Resource
    Carboxonium-Ionen-Reaktionen cyclischer Acetale, VII Synthese von rac-4,5,6,7-Tetrahydro-3,5-dimethyl-1-benzofuran sowie eines Gemisches seiner 3,4- und 3,6-Dimethylisomeren (1982)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1982 (1982), S. 2163-2171 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Carboxonium Ions of Cyclic Acetals, VII1).  -  Synthesis of rac-4,5,6,7-Tetrahydro-3,5-dimethyl-1-benzofuran and of a Mixture of its 3,4- and 3,6-Dimethyl IsomersThermolysis of the 4-methylene-1,3-dioxolanes 4 or of the β-oxa-γ,δ-enones 6 leads in the presence of protons to rac-4,5,6,7-tetrahydro-3,5-dimethyl-1-benzofuran (5a) and to a mixture of its 3,4- and 3,6-dimethyl isomers 5b/5c. The mechanism of the furan formation has been investigated.
    Notes: Durch Thermolyse der 4-Methylen-1,3-dioxolane 4 oder der β-Oxa-γ,δ-enone 6 entstehen in Gegenwart von Protonen rac-4,5,6,7-Tetrahydro-3,5-dimethyl-1-benzofuran (5a) sowie ein Gemisch von dessen 3,4- und 3,6-Dimethylisomeren 5b/5c. Der Mechanismus der Furanbildung wird untersucht.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198219821207
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  • 8
    Electronic Resource
    Electronic Resource
    Carboxonium-Ionen-Reaktionen cyclischer Acetale, IX. Synthese von Rosenfuran und strukturverwandter terpenoider Ester, Alkohole und Olefine (1986)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1986 (1986), S. 731-740 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reaction of Carboxonium Ions of Cyclic Acetals, IX.  -  Synthesis of Rosefuran and Structurally Related Terpene-like Esters, Alcohols, and OlefinsThermolysis of the 4-(o-toluoyloxy)-1,3-dioxolanes 4 leads to the furans 6/7 which, via Grignard reaction, can be converted into the alcohols 8/9. Subsequent dehydratization affords the olefins 10/11, e.g. rosefuran (10a).
    Notes: Thermolyse der 4-(o-Toluoyloxyl)-1,3-dioxolane 4 führt zu den Furanen 6/7, die via Grignard-Reaktion zu den Alkoholen 8/9 und durch anschließende Dehydratisierung zu den Olefinen 10/11, z. B. Rosenfuran (10a), umgesetzt werden können.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198619860412
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  • 9
    Electronic Resource
    Electronic Resource
    Diastereoselektive Synthese von (1RS)-endo-Brevicomin (1984)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1984 (1984), S. 147-156 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Diastereoselective Synthesis of (1RS)-endo-Brevicomin(1RS-endo-Brevicomin (1) is synthesized starting from trans-1-bromo-2-pentene. Synthetic key step is the diastereoselective linkage of erythro-2,3-butanediol to 3,3-dimethoxy-1-(phenylsulfonyl)-butane or methyl 4,4-dimethoxypentanoate.
    Notes: (1RS)-endo-Brevicomin (1) wird ausgehend von trans-1-Brom-2-penten synthetisiert. Schlüsselreaktion ist die diastereoselektive Verknüpfung von erythro-2,3-Butandiol mit 3,3-Dimethoxy-1-(phenylsulfonyl)butan oder 4,4-Dimethoxypentansäure-methylester.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198419840115
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  • 10
    Electronic Resource
    Electronic Resource
    Darstellung der enantiomeren erythro- und threo-1,2,3-Pentantriole mit Hilfe einer enzymatischen Racematspaltung (1987)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1987 (1987), S. 629-632 
    Details
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Preparation of Enantiomeric erythro- and threo-1,2,3-Pentanetriols by an Enzymatic Recemate Resolution(2R,3S)- and (2S,3R)-erythro- (9a/9b) as well as (2R,3R)- and (2S,3S)-threo-1,2,3-pentanetriol (10a/10b) are synthesized from the rac. trans- and cis-isomeric 2,3-epoxypentyl butyrates 5/6 by Lipase-controled racemate resolution followed by regioselective ring opening of both the chiral epoxy alcohols 3a/3b and 4a/4b, respectively. Whereas the erythro-triols 9a and 9b are obtained in very good enantiomeric excesses, the reaction sequence yields poor ee values in the case of the threo-triols 10a and 10b.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.198719870710
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