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Updated: Aug 27, 2025

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Well-Defined Aryl-FeII Complexes in Cross-Coupling and C-H Activation Processes
Carla Magallón1, Oriol Planas1, Steven Roldán-Gómez1
1Institut de Química Computacional i Catàlisi (IQCC) and Departament de Química, Universitat de Girona, Campus Montilivi, Girona E-17003, Catalonia, Spain.
Abstract:
Herein we explore the intrinsic organometallic reactivity of iron embedded in a tetradentate N3C macrocyclic ligand scaffold that allows the stabilization of aryl-Fe species, which are key intermediates in Fe-catalyzed cross-coupling and C-H functionalization processes. This study covers C-H activation reactions using L and FeCl2, biaryl C-C coupling product formation through reaction with Grignard reagents, and cross-coupling reactions using L or L in combination with Fe0(CO)5. Synthesis under light irradiation and moderate heating (50 °C) affords the aryl-FeII complexes [FeII(Br)( L)(CO)] (1 ) and [FeII( L)(CO)2]Br (1 ). Exhaustive spectroscopic characterization of these rare low-spin diamagnetic species, including their crystal structures, allowed the investigation of their intrinsic reactivity.
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