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  • 1
    Electronic Resource
    Electronic Resource
    Metallierung einer nichtaktivierten Alkyl-Gruppe im Nickelkomplex (1976)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 109 (1976), S. 1657-1664 
    Details
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metalation of a Non-activated Alkyl Group in Nickel ComplexesThe diazadiene (DAD)glyoxalbis(diisopropylmethylimine) (1) reacts with anhydrous nickel bromide to yield (DAD)NiBr2 (2). Its reactions with main group metal alkyls lead to rather unstable intermediates. With the bulky O-tolylmagnesium bromide -under formal HBr abstraction- metalation of the diisopropylmethyl substituent occurs in γ-position to the next activating center (N) with formation of an N—C chelate. Properties and structure of this product 3 from this novel alkane activation reaction are discussed.
    Notes: Aus dem Diazadien (DAD) Glyoxalbis (diisopropylmethylimin) (1) und wasserfreiem Nickelbromid wird (DAD)NiBr2 (2) erhalten, dessen Reaktion mit Hauptgruppenmetall-alkylen zu wenig stabilen Zwischenprodukten führt. Mit dem sperrigen O-Tolylmagnesiumbromid wird unter formaler HBr-Abspaltung die Metallierung des Diisopropylmethyl-Rests von 2 in γ-Stellung zum nächsten aktivierenden Zentrum (N) unter Bildung eines N—C-Chelatrings erreicht. Eigenschaften und Struktur dieses Produkts (3) einer neuartigen Alkanaktivierung werden diskutiert.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19761090508
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  • 2
    Electronic Resource
    Electronic Resource
    Gürtelförmige Moleküle mittels repetitiver Synthesestrategie (1994)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 127 (1994), S. 767-777 
    Details
    ISSN: 0009-2940
    Keywords: Azaphanes ; Cyclophanes ; Macrocycles ; Molecular belts ; Multistep strategy ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Belt-Shaped Molecules by a Repetitive Synthetic StrategyBelt-shaped molecules of the general type 2 containing up to five benzene ring units (cf. 37) have been synthesized by macrocyclisation reactions of ribbon-shaped precursors. An intermolecular cyclization step generates the macroheterocycles 38 and 40. The fourfold-bridged cyclophane 36 are prepared by intra-and intermolecular cyclization reactions. The X-ray structure analyses of 14, 16, 22, 23, 28, and 36 show S-shaped conformations of the molecules.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19941270428
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Stimulation by cholera toxin of ADP-ribosylation of membrane proteins, adenylate cyclase and insulilin release in pancreatic islets (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    Cell Biochemistry and Function 3 (1985), S. 25-32 
    Details
    ISSN: 0263-6484
    Keywords: Pancreatic islets ; cholera toxin ; adenylate cyclase ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: In rat pancreatic islet membranes exposed to [α-32P]NAD, cholera toxin stimulated the labelling of three peptides with Mr close to 22000, 42000 and 48000, respectively. In the islets, the toxin-stimulated ADP-ribosylation of the heavy form of the Ns α-subunit predominated over that of the light from, in mirror image of the situation found in the exocrine pancreas. When intact islets were preincubated with cholera toxin, the adenylate cyclase activity of a subcellular particulate fraction was increased. The responsiveness of adenylate cyclase to GTP was also augmented, but that to NaF was decreased. In intact islets, the production of cyclic AMP and the glucose-stimulated release of insulin were also enhanced after pretreatment with cholera toxin. These findings reveal the presence in pancreatic islets of the guanyl nucleotide regulatory protein of adenylate cyclase, with an unusual predominance of the heavy from of the Ns α-subunit.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cbf.290030107
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    Paper (German National Licenses)
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