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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 116 (1983), S. 1906-1913 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Highly Selective Clatharte Host Molecules for the Inclusion of Branched and Unbranched Alcohols, Especially for 2-Propanol and EthanolThe new crown compounds 1, 4, and 11 represent a novel type of alcohol bindung clathrate host molecules, which allow structural variation in many ways. The compounds can be used to select unbranched from branched and lower from higher alcohols. From alcohol containing solvent mixtures preferentially the alcohol clathrates crystallize. On the basis of a qualitative host structure/clathrate binding relationship, obtained from this study, a guideline for the design of new clathrate forming host molecules is derived. - The yields in the syntheses of some of the cyclic compounds is drastically raised using the „caesium effect“ (Cs2CO3 in DMF).
    Notes: Mit den Kronenverbindungen 1, 4 und 11 wird ein neuartiger Typ von Alkohol-bindenden Clathrat-Wirtmolekülen erschlossen, der strukturell vielseitig variierbar ist. Damit ist es möglich, unverzweigte von verzweigten sowie nieder- von höhermolekularen Alkoholen zu selektieren. Umkristallisation aus alkoholhaltigen Lösungsmittelgemischen führt bevorzugt zu den Alkoholclathraten. Aus den bisher ersichtlichen qualitativen Beziehungen zwischen Wirtstruktur und Clathratbildung werden Richtlinien zum Entwurf neuer selektiver Clathratbildner abgeleitet. - Die Ausbeuten an cyclischen Verbindungen lassen sich mit Hilfe des „Cäsium-Effektes“ (Cs2CO3 in DMF) zum Teil drastisch erhöhen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1434-193X
    Keywords: Oligo(bipyridines) ; Supramolecular chemistry ; Functionalized bipyridines ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The 6,6′-disubstituted 2,2′-bipyridines and oligo(bipyridines) are often used as ligands in supramolecular chemistry; however, their range of application has been limited due to the lack of unsymmetrically functionalized compounds and their poor solubility. We describe herein a new generation of specially designed unsymmetrical bipyridine building blocks possessing different protecting groups for the hydroxy functionality and reasonable solubility behavior. These molecules permit the synthesis of a wide range of functionalized oligo(bipyridines) with new potential applications in supramolecular chemistry and materials science. As initial examples, we present the synthesis of mono- and bis-functionalized bis- and tris-2,2′-biypridines.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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