Four C−C bonds are formed in a single step by an intermolecular four-component cascade pathway. 1-Phenyl-9-phenylsulfonyl-9,10-dihydrophenanthrenes are formed in the palladium-catalyzed Heck-like reaction of α,β-unsaturated phenyl sulfones with three equivalents of iodobenzene in the presence of Ag2CO3 [Eq. (1)].
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Mauleón et al. (2001) studied this question.