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Catalysts for the Sonogashira Coupling—The Crownless Again Shall Be King

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Commoners displacing the nobility? The scope of the Sonogashira coupling is widening with the discovery of new catalytic systems based on a variety of metals (see picture). In particular, cheap common metals are finding a place in transformations that were previously controlled by noble metals. The developments are examined, and the advantages and disadvantages of the various catalytic systems are discussed.

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