Catalytic efficacy of Schiff base-palladium complexes in important C–C cross coupling reactions: a brief overview

Cross coupling reactions constitute a useful and efficient approach utilized primarily in the synthesis of carbon–carbon bonds in modern organic synthesis. Among this class of reactions, Suzuki–Miyaura reaction, Sonogashira, and Mizoroki–Heck reactions are mostly utilized. Palladium-facilitated cross-coupling reactions have received a lot of interest from researchers recently. In order to fine-tune the catalytic activity of metals, different ligands were used to complex with them. Among the great variety of ligands, Schiff base (SB) ligands constitute a major part. The transition metal complexes of these ligands have interesting chemistry and are widely utilized for industrial purposes. They also exhibit a broad range of biological activities. Herein, this review is mainly aimed to discuss the synthesis of different SB ligands, along with their palladium complexes and their application as both homogeneous as well as heterogeneous catalysts in various C–C cross coupling reactions.