Dinuclear PdII complexes bearing mixed NHC/Py/PPh3 donor set ligands: Catalytic applications and electrochemical investigations. (23rd October 2022)

• Record Type: Journal Article
• Authors: Naskar, Rajat; Mondal, Bhaskar; Majumder, Adhir; Bag, Jayanta; Maity, Ramananda
• Is Part Of: Applied organometallic chemistry. Volume 37:Number 1(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-10-23
• Subjects: bimetallic complexes -- mixed NHC/PPh3 donor ligands -- Suzuki–Miyaura coupling reaction -- α‐Arylation of oxindole; Organometallic chemistry -- Periodicals; Organometallic compounds -- Periodicals; 547.05
• DOI: 10.1002/aoc.6921
• Languages: English
• ISSNs: 0268-2605

Abstract

Abstract : Bimetallic palladium(II) complexes containing classical NHC donor ligands are becoming increasingly popular owing to their various catalytic applications. However, examples of the aforementioned complexes with mixed NHC/PPh3 ligands are still rare. Bimetallic palladium(II) complexes possessing these mixed ligands are described starting from a C2‐symmetric bis‐imidazolium salt containing 4, 4′‐substituted central biphenyl ring. All the palladium(II) complexes have been tested as precatalysts in α‐arylation of oxindole and Suzuki–Miyaura coupling reactions. The complex composed of mixed NHC/PPh3 donor ligands shows superior catalytic activity compared with the corresponding PEPPSI type complexes when applied in α‐arylation of oxindole. The dinuclear complexes display better activity compared with the mononuclear complexes. The preliminary electrochemical measurements show the facile oxidation of Pd II in the presence of combined NHC/PPh3 ligands compared with a combination of NHC/Py ligands. Abstract : Bimetallic palladium(II) complexes containing classical bis‐NHC donor ligand are presented. The complex composed of mixed NHC/PPh3 donor ligands shows superior catalytic activity compared with the corresponding PEPPSI type complexes when applied in α‐arylation of oxindole. The preliminary electrochemical measurements show the facile oxidation of Pd II in the presence of combined NHC/PPh3 ligands compared with a combination of NHC/Py ligands.