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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 113 (1980), S. 1584-1591 
    ISSN: 0009-2940
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Polycyclic Compounds, XVII. 1,4-Carbonyl Group Transposition Studies in the Tetrahydrobenzocycloheptenone SeriesThe protected carbonyl group in the seven-membered ring of the oxanorbornadiene 1 is shifted by the 1,4-carbonyl group transposition sequence 1 → 4 → 5 → 3 into the ortho-position of a methoxycarbonyl group. Thereby 1,2- and 3,4-disubstituted tetrahydrobenzocyclohepten-5-one derivatives 2 and 3 are available as well starting from 1. The compound 5 exists in solution predominantly as arene oxide 5B. Experiments to cleave the dioxolane ring led under additional formation of a five-membered ring to the lactol ethers 6.
    Notes: Die als Dioxolan geschützte Carbonylgruppe im Siebenring des Oxanorbornadiens 1 wird durch die 1,4-Carbonylgruppen-Transpositionsfolge 1 → 4 → 5 → 3 in die ortho-Position zu einer Methoxycarbonylgruppe verschoben. Dadurch werden ausgehend von 1 sowohl 1,2- als auch 3,4-disubstituierte Tetrahydrobenzocyclohepten-5-on-Derivate 2 und 3 zugänglich. Das Zwischen-produkt 5 liegt in Lösung überwiegend als Arenoxid 5B vor. Versuche zur Dioxolanspaltung führten unter zusätzlichem Fünfringschluß zu den Lactolethern 6.
    Type of Medium: Electronic Resource
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