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The coupling chemoselectivity strongly depends on whether Cp or the methylated Cp* ligands are employed. The pentamethyl derivative [Cp*RhCl2 ]2 predominantly gives isocoumarins, while the non-methylated complex [CpRhI2 ]n produces naphthalene derivatives. The polyaromatic carboxylic acids (such as for instance 1-naphthoic acid, 1-pyrenecarboxylic acid, fluorene-1-carboxylic acid, and dibenzofuran-4-carboxylic acid) tend to be ideal for this approach. A mixture of Cp*H/RhCl