Catalytic Cross-Coupling Reactions

Catalytic cross-coupling reactions are chemical processes in which two molecular fragments are joined together, typically through a new carbon–carbon bond, using a transition metal catalyst to drive the transformation. Palladium is the workhorse catalyst here, enabling chemists to connect aryl halides and other building blocks with remarkable precision under conditions that would otherwise be impossible, and these reactions now underpin the synthesis of pharmaceuticals, agrochemicals, and advanced materials worldwide. Active research is pushing toward cheaper, earth-abundant alternatives such as nickel, which behaves differently enough from palladium to open entirely new reactivity patterns while also raising questions about how the catalyst operates at the molecular level. Understanding whether the active catalyst exists as dissolved molecular species or as metal nanoparticles—the homogeneous versus heterogeneous question—remains a live debate with direct consequences for designing more selective and recyclable systems.

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Keywords

Palladium-CatalyzedCross-Coupling ReactionsTransition Metal CatalysisOrganic SynthesisC-C Bond FormationHomogeneous and Heterogeneous Catalysis