A platinum-catalyzed annulation reaction leading to medium-sized rings
Literature Information
Dirk Hildebrandt, Wiebke Hüggenberg, Matthias Kanthak, Tobias Plöger, Iris M. Müller, Gerald Dyker
A platinum-catalyzed domino process with intermediate benzopyrylium cations reaches its optimum utility in the formation of 7- and 8-membered rings. With iron(III) chloride, a tetracyclic product is isolated, derived from an oxidative transformation of a metal–carbene intermediate.
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Chemical Communications

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