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  • Articles: DFG German National Licenses  (2)
  • Cationic rearrangements  (1)
  • Deuterated 1,3-cyclohexadienes  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 691-700 
    ISSN: 0009-2940
    Keywords: Cationic rearrangements ; Nitrenium ions ; Ion pairs ; Regio- and stereoselectivity ; NMR, 17O ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Cationic Rearrangements of 2-Azabicyclo[3.2.0]heptane Systems. - NMR and MS Methods for the Analysis of 17O- or 18O-Labelled CompoundsO-Tosylation of 2-hydroxy-2-azabicyclo[3.2.0]hept-6-ene and -heptane results in rearrangements to 1-aza-[2.2.1] systems. The regioselectivity is caused by kinetic control. High stereose-lectivity, partial scrambling of the O-label and low yields in cross-over experiments agree with the intermediacy of tight ion pairs. - For the quantitative analysis of labelling, 17O-NMR, 13C-NMR and mass spectrometry are optimized and their efficiencies compared.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 209-215 
    ISSN: 0009-2940
    Keywords: Rhodium chloride ; Hydrogen transfer ; Deuterated 1,3-cyclohexadienes ; Isotope effects ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogen Transfer Reactions, 19.  -  The Catalysis of Hydrogen Transfer and 1,5-H Shift by Rhodium(III) Chloride in Homogeneous Organic SystemsIn homogeneous solution, partly in the presence of a phase-transfer catalyst, rhodium(III) chloride catalyzes the disproportionation of 1,3-cyclohexadiene and to a lesser extent 1,5-H shifts. In the start phase the catalyst is reduced to the active monovalent state. In these catalytic systems the dehydrogenation proceeds stereoselectively. - This was shown by tracer experiments and isotopes effects using deuterated 1,3-cyclohexadienes 1a - d, which were synthesized with high isotopomeric purity.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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