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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 125 (1992), S. 2493-2501 
    ISSN: 0009-2940
    Keywords: Ozonolysis ; Carbonyl oxides ; Ketene acetals ; 1,2-Dioxolanes ; Ozonides, primary ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: New Studies Concerning the Reactivity of Formaldehyde Oxide, Acetaldehyde Oxide, and Propionaldehyde OxideReactivity and selectivity of formaldehyde oxide (1a), acetaldehyde oxide (1b), and propionaldehyde oxide (1c) is tested by adding a cooled solution of one or two dipolarophiles to a solution of the primary ozonides of the olefins 2a, 2b or the ketene acetals 7a-c, respectively. Different selectivities are observed for the different carbonyl oxides. Only 1a is able to react with non-activated olefins like methylenecyclopentane (4a), norbornene (4b), 3-methylstyrene (4c), and cyclopentadiene (4d) under these conditions. Activated olefins turn out to be good quenchers for 1a. Both 1a and 1b react with fulvene 4e in completely different ways. Contrary to 1a, the carbonyl oxides 1b and 1c clearly prefer carbonyl compounds to activated olefins.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 126 (1993), S. 1419-1423 
    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
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