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Arylselenolate-based copper complexes have been synthesized and used as pre-catalysts for azide-alkyne cycloaddition reactions.

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Palladium complexes of phosphine free pincer based ligands are currently growing credence as efficient catalysts for C–C cross‐coupling reaction under environmentally benign and mild reaction conditions. A series of new palladium complexes 2 a–2 c supported by 2,6‐bis(pyrrolyl)pyridine based [NNN]‐pincer ligands have been synthesized, and their catalytic activities for Suzuki‐Miyaura cross‐coupling reaction were examined. The palladium complexes (2 a–2 c) were synthesized by the reaction of 2,6‐bis(pyrrolyl)pyridine ligands (LH2) with Pd(OAc)2 in acetonitrile as a solvent. Electrochemical studies of complexes 2 a–2 c showed two prominent oxidation peaks, which were ascribed to the dianionic pyrrolide ligand and an oxidation peak that can be ascribed to palladium metal center. There is an exhibition of well‐coordinated metal directed oxidation of the complexes which indicates a well‐established electronic network. Computational studies on complexes 2 a–2 c further supported the experimental observations. These palladium complexes 2 a–2 c can efficiently catalyze Suzuki‐Miyaura cross‐coupling reaction of aryl bromides in an aqueous medium.

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Well‐defined and air‐stable PEPPSI (Pyridine Enhanced Precatalyst Preparation Stabilization and Initiation) themed palladium bis‐N‐heterocyclic carbene complexes have been developed for the domino Sonogashira coupling/cyclization reaction of 2‐iodophenol with a variety of terminal alkynes and C‐H bond arylation of benzothiazole with aryl iodides. The PEPPSI themed palladium complexes, 2a and 2b were synthesized in good yields from the reaction of corresponding imidazolium salts with PdCl2 and K2CO3 in pyridine. The new air‐stable palladium‐NHC complexes were characterized by NMR spectroscopy, X‐ray crystallography, elemental analysis, and mass spectroscopy studies. The PEPPSI themed palladium(II) bis‐N‐heterocyclic carbene complexes 2a and 2b exhibited excellent catalytic activities for domino Sonogashira coupling/cyclization reaction of 2‐iodophenol with terminal alkynes yielding benzofuran derivatives. In addition, the palladium complexes, 2a and 2b successfully catalyzed the direct C‐H bond arylation of benzothiazole with aryl iodides as coupling partners in presence of CuI as co‐catalyst.