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Updated: Apr 18, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
Published on: March 20, 2017
A simple access to transition metal cyclopropenylidene complexes
Yannick D Bidal1, Mathieu Lesieur, Mohand Melaimi
1EaStCHEM School of Chemistry, University of St. Andrews, St. Andrews, KY16 9ST, UK. cc111@st-andrews.ac.uk.
Researchers developed a novel bis(diisopropylamino)cyclopropenylidene copper (BAC-Cu) complex, a versatile carbene-transfer reagent. This new complex facilitates the synthesis of various metal-BAC compounds and shows high catalytic activity in Click chemistry.
Area of Science:
- Organometallic Chemistry
- Catalysis
Background:
- Carbene complexes are crucial in catalysis.
- Developing new carbene transfer reagents is essential for synthetic chemistry.
Purpose of the Study:
- To report the first bis(diisopropylamino)cyclopropenylidene copper (BAC-Cu) complex.
- To demonstrate its utility as a carbene-transfer reagent.
- To explore its catalytic applications.
Main Methods:
- Synthesis of the BAC-Cu complex.
- Utilizing the complex for carbene transfer to generate Au-, Pd-, Ir-, and Rh-BAC compounds.
- Performing catalytic experiments, specifically in Click chemistry.
Main Results:
- The successful synthesis of the first BAC-Cu complex.
- Demonstration of carbene transfer capabilities to various transition metals.
- High catalytic activity observed for the [CuCl(BAC)] complex in Click chemistry.
Conclusions:
- The BAC-Cu complex represents a novel and effective carbene-transfer reagent.
- This development expands the toolkit for synthesizing organometallic compounds.
- The complex shows significant promise for catalytic applications, particularly in Click chemistry.
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