Double or nothing! A straightforward and high-yielding approach to a variety of polycyclic aromatic hydrocarbons has been achieved through palladium-catalyzed annulation of 9,9-dimethyl-9-stannafluorenes and dithienostannole with 1,2-dihaloarenes (see scheme). In addition, 1,1-dibromo-1-alkenes can also be applied to this annulation to produce dibenzofulvenes in excellent yields.
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Nagao et al. (2009) studied this question.
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