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Updated: Jun 16, 2026

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Aryl-CF(3) bond-forming reductive elimination from palladium(IV).
Nicholas D Ball1, Jeff W Kampf, Melanie S Sanford
1Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, USA.
New palladium complexes facilitate the formation of aryl-trifluoromethyl bonds through an oxidative process. This method, utilizing an electrophilic fluorinating reagent, offers a novel pathway for arene trifluoromethylation reactions.
Area of Science:
- Organometallic Chemistry
- Fluorine Chemistry
- Catalysis
Background:
- Palladium complexes are crucial in catalysis.
- Arene trifluoromethylation is a significant synthetic transformation.
- Developing efficient methods for C-CF3 bond formation is essential.
Purpose of the Study:
- To describe a new Pd(II) complex system for Ar-CF3 bond formation.
- To investigate the mechanism of oxidatively induced reductive elimination.
- To establish a Pd(II/IV) catalytic cycle for arene trifluoromethylation.
Main Methods:
- Synthesis and characterization of novel Pd(II) complexes.
- Reaction optimization using an electrophilic fluorinating reagent.
- Isolation and characterization of a Pd(IV) intermediate.
Main Results:
- Successful Ar-CF3 bond formation via reductive elimination from Pd(II) complexes.
- Good to excellent yields achieved using N-fluoro-2,4,6-trimethylpyridinium triflate.
- Isolation and characterization of a key Pd(IV) intermediate that undergoes thermolysis to form the Ar-CF3 bond.
Conclusions:
- Demonstrated a novel pathway for Ar-CF3 bond formation.
- Established a Pd(II/IV) catalytic cycle for arene trifluoromethylation.
- Provided a conceptual framework for developing new catalytic trifluoromethylation reactions.
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