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  • 1
    Electronic Resource
    Electronic Resource
    Tri-, Tetramethylbullvalene und Hexamethylbibullvalenyl (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1419-1423 
    Details
    ISSN: 0009-2940
    Keywords: Cope rearrangement ; Bullvalenes, tri-, tetramethyl- ; Bibullvalenyl, hexamethyl ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Tri-, Tetramethylbullvalenes and HexamethylbibullvalenylThe known monomethylbullvalenes 6 and dimethylbullvalenes 7 are supplemented by tri-8 and tetramethylbullvalenes 9 as well as the hexamethylbibullvalenyl 10. The isomer distributions of the methylbullvalenes 6-9 are determined by NMR-spectroscopy. A vicinal arrangement of two methyl groups is not found. The 4-, 6-, 10-positions are slightly preferred in respect to the 3-, 7-, 9-positions. In the case of the methylbullvalenes 8 and 9 methyl groups occupy additionally the 1-, 2-, 8- but not the 5-position. Contrary to tetrabromobullvalenes 5, isomers of 9 show no pronounced kinetic stability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260622
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  • 2
    Electronic Resource
    Electronic Resource
    Mono-, Di-, Tri-, Tetra-, Penta-und Hexaphenylbullvalene (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1429-1433 
    Details
    ISSN: 0009-2940
    Keywords: Cope rearrangement ; Bullvalenes, mono-, di-, tri-, tetra-, penta-, and hexaphenyl- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Mono-, Di-, Tri-, Tetra-, Penta-and HexaphenylbullvalenesLithium diphenylcuprate reacts with the corresponding bromobullvalenes to yield the phenylbullvalenes 1-6, whose substitution patterns are deduced from their 1H-NMR spectra. Starting with triphenylbullvalenes 3 some isomers show a relatively high kinetic stability which culminates in the case of the hexaphenylbullvalenes 6a and 6b in the loss of the phenomenon of fluctuating structure for the bullvalene skeleton.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260624
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  • 3
    Electronic Resource
    Electronic Resource
    Penta-und Hexabrombullvalene (1993)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1425-1427 
    Details
    ISSN: 0009-2940
    Keywords: Cope rearrangement ; Bullvalenes, pentabromo-and hexabromo- ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Penta-and HexabromobullvalenesThe Pentabromobullvalenes 2a-d and the hexabromobullvalenes 3a/b are synthesized and the corresponding isomers are identified. 2 constitutes an equilibrium of four isomers. The isomer 2a is separated from the mixture by column chromatography. For the kinetically most stable isomer 2a the half-life time for equilibration at 55°C amounts to ca. 30 h. Two non-equilibrating isomers 3a and 3b are isolated, however, in the case of hexabromobullvalene 3. The bullvalene-typical property of a fluxional structure is now practically no longer existent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cber.19931260623
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