Palladium-Catalyzed [2 + 2 + 2] Cycloadditions of 3,4-Didehydrophenanthrene and 1,2-Didehydrotriphenylene.

[摘要]：Palladium-catalyzed [2 + 2 + 2] cycloaddn. reactions of 3,4-didehydrophenanthrene (3,4-phenanthryne) and 1,2-didehydrotriphenylene (1,2-triphenylyne) afford sterically congested polycyclic arom. hydrocarbons with novel structures, e.g. I (E = CO2Me).

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