Chiral Bis(pyridylimino)isoindoles: A Highly Modular Class of Pincer Ligands for Enantioselective Catalysis

Living Radical Polymerization of Acrylates Mediated by 1,3‐Bis(2‐pyridylimino)isoindolatocobalt(II) Complexes: Monitoring the Chain Growth at the Metal

“…The monoanionic meridionally coordinating bpi ligands are structurally related to phthalocyanines and porphyrins lacking the fourth coordinating N donor. [27][28][29][30][31][32][33][34][35] As will be apparent below, pentacoordinate bpi-Co II complexes act as efficient mediators for radical polymerizations of acrylates and give rise to living behavior. A principal objective of this work is the presentation of mechanistic insight into the processes during the initial period of the polymerization reaction, as well as the in situ detection of the intermediates of radical polymerization.…”

Efficient and Selective Hydrosilylation of Carbonyl Compounds Catalyzed by Iron Acetate and N‐Hydroxyethylimidazolium Salts

“…[8] Brunner first reported the iron-catalyzed hydrosilylation of carbonyl compounds in the early 1990s, [9] however, it was not until rather recently that other reports on this particular transformation appeared in the literature. The groups of Nishiyama, [10] Gade, [11] Chirik, [12] Tilley, [13] and Beller [14] have individually presented efficient iron-based protocols for the hydrosilylation of aldehydes, ketones and imines. The catalyst systems used in these studies are all based on N-and P-donor ligands.…”

Chiral Bis(oxazolinyl)phenyl RuII Catalysts for Highly Enantioselective Cyclopropanation

“…In this context, introduction of a chiral moiety as part of the ligand framework to create transition-metal catalysts for asymmetric reactions has been investigated. Recently, several highly reactive Ru and Os complexes with chiral CNN-type ligands [2] and Fe and Co complexes with chiral bis(pyridylimino)isoindole ligands [3] were reported as active chiral catalysts.During our investigation of transition-metal catalysts with chiral meridional NCN ligands, we reported the bis(oxazolinyl)phenyl (phebox) ligand as one of a larger family of ligands including bis(oxazolinyl)pyridine (pybox).[4] Although the meridional geometry of the phebox ligand is similar to that of the pybox ligand, the metal complex with the phebox ligand possesses a metal-carbon s bond that may induce different reactivities. We anticipated that the simple change from a benzene substituent to a pyridine ring as the ligand backbone would lead to a change in the catalytic performance of the complex.…”