Hydroboration of Aldehydes, Ketones, and Carbodiimides Promoted by Mono(imidazolin‐2‐iminato) Hafnium Complexes
Maxim Khononov, Natalia Fridman, Matthias Tamm, Moris S. Eisen
Abstract
Imidazolin‐2‐iminato hafnium complexes of the type [(Im R N)Hf(CH 2 Ph) 3 ] were synthesized (Im t Bu N = 1,3‐di‐ tert ‐butylimidazolin‐2‐iminato); Im Dipp N = 1,3‐bis(2,6‐diisopropylphenyl)‐imidazolin‐2‐iminato. The complexes were crystallized and structurally characterized. Despite the oxophilicity of the hafnium center, both hafnium complexes were catalytically active in the hydroboration of aldehydes, ketones, and carbodiimides. Herein, we present the influence of different substrates bearing electron‐withdrawing or electron‐donating groups on the catalytic reactions. Based on stoichiometric reaction in each process, plausible mechanistic scenarios are presented.
Topics & Concepts
ChemistryHafniumHydroborationCatalysisStoichiometryMedicinal chemistryLigand (biochemistry)Inorganic chemistryOrganic chemistryReceptorZirconiumBiochemistryOrganoboron and organosilicon chemistryOrganometallic Complex Synthesis and CatalysisCarbon dioxide utilization in catalysis