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(a) Elementary steps in the mechanism of the Sonogashira cross-coupling reaction (blue) and the competitive iodobenzene (IB, red) and phenylacetylene (PA, green) homocoupling processes. (b) Selectivity toward the desired cross-coupling product (diphenylacetylene, DPA) obtained with different gold-based catalysts. Reproduced with permission from ref (346). Copyright 2017 Elsevier.
