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  • Organic Chemistry  (2)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1980 (1980), S. 928-937 
    ISSN: 0170-2041
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: On the Mechanism of the Reductive Elimination of Substituted Biphenyls from cis-Bis(aryl)bis(triphenylphosphane)platinum(II)-CompoundsThe compounds cis-[Pt(PPh3)2(4-CH3O-C6H4)2], cis-{Pt(PPh3)2[4-(CH3)2N-C6H4]2, cis-{Pt(PPh3)2[4-(CH3)2N - C6H4](4-CH3O-C6H4)}, cis-{Pt(PPh3)2[4-(CH3)2N - C6H4](C6H5)} and cis-[Pt(PPh3)2(4-CH3O - C6H4)(C6H5)] were synthesized and the temperatures of reductive elimination of substituted biphenyls measured by differential calorimetry. Linkage between the two phenyl rings to form the biphenyl system occurs exclusively at the carbon atoms bonded directly to platinum.
    Notes: Die Verbindungen cis-[Pt(PPh3)2(4-CH3O-C6H4)2], cis-{Pt(PPh3)2[4-(CH3)2N-C6H4]2, cis-{Pt(PPh3)2[4-(CH3)2N - C6H4](4-CH3O-C6H4)}, cis-{Pt(PPh3)2[4-(CH3)2N - C6H4](C6H5)} und cis-[Pt(PPh3)2(4-CH3O - C6H4)(C6H5)] wurden synthetisiert und ihre Zersetzungs-Temperaturen der reduktiven Eliminierung substituierter Biphenyle differential-kalorimetrisch gemessen. Die Verknüpfung zum Biphenyl-System erfolgt ausschließlich zwischen den unmittelbar an das Platin gebundenen Kohlenstoff-Atomen beider Phenyl-Ringe.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0075-4617
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Reactions of Medium-sized Rings, IVl ). Stereospecific Synthesis of a 2,7-Dioxa-twistan HomologueEpoxidation of trans,cis-1,5-cyclodecadiene (1) gives the diepoxide 5. Hydrolysis of both epoxides gives via transannular ether formation to 2,8-dihydroxy-11-oxa-bicyclo[5,3,1]undecane (6). Proton catalyzed intramolecular elimination of water from 6 results in a diether 7, which is identified by proton n.m.r. spectrum as a homologue of 2,7-dioxa-twistan in which one of the six-membered rings is expanded to an eight-membered ring by insertion of two methylene groups.
    Notes: Durch Epoxydierung von trans, cis-1.5-Cyclodecadien (1) wird das Diepoxid 5 hergestellt, das unter Einbeziehung beider Epoxidgruppen und unter transannularer äther-Bildung bei der Hydrolyse 2.8-Dihydroxy-11-oxa-bicyclo[5.3.1]undecan (6) liefert. Aus 6 entsteht durch Protonen-katalysierte intramolekulare Wasser-Abspaltung der Diäther 7, der mit Hilfe des PMR-Spektrums als Homologes vom 2.7-Dioxa-twistan identifiziert wird, in welchem ein Sechsring durch Einschiebung von zwei Methylengruppen zum Achtring aufgeweitet ist.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
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