The High-Pressure Cycloadditions of Tropone to Styrenes. Predominant Formation of [8+2] Cycloadducts from α-Methylstyrene

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  • The High-Pressure Cycloadditions of Tropone to Styrenes Predominant Formation of〔8+2〕Cycloadducts from α-Methylstyrene
  • High Pressure Cycloadditions of Tropone

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High-pressure cycloaddition reactions of tropone to styrene up to 140℃ under various pressures proceeded to give, despite two products were identified previously, four Diels-Alder adducts, among which, the 9-phenylbicyclo[3.2.2]nona-3,6-dien-2-ones were predominant over 8-phenyl derivatives. On the other hand, the reaction with α-methylstyrene gave three Diels-Alder adducts and two [8+2] cycloadducts, but a noticeable feature was a predominance of the latter.

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