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Updated: Nov 24, 2025

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
Electrooxidative B-H Functionalization of nido-Carboranes
Meng Chen1, Deshi Zhao1, Jingkai Xu1
1State Key Laboratory of Coordination Chemistry, Jiangsu Key Laboratory of Advanced Organic Materials, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210023, China.
A new electrochemical method enables direct B-H functionalization of nido-carboranes. This green approach avoids metal catalysts and efficiently couples nido-carboranes with various heteroatoms, facilitating drug motif incorporation.
Area of Science:
- Inorganic Chemistry
- Organic Synthesis
- Electrochemistry
Background:
- Nido-carboranes are versatile boron clusters with potential applications in medicinal chemistry.
- Traditional methods for functionalizing nido-carboranes often require harsh conditions or transition-metal catalysts.
- Developing atom-economical and environmentally friendly synthetic routes is crucial for advancing carborane chemistry.
Purpose of the Study:
- To develop a novel, atom-economical method for the direct B-H functionalization of nido-carboranes.
- To utilize electrochemical oxidation as a sustainable alternative to traditional chemical oxidants.
- To demonstrate the broad applicability and efficiency of the developed method for incorporating nido-carboranes into diverse molecular structures.
Main Methods:
- Electrochemical anodic oxidation was employed for the direct functionalization of nido-carboranes (7,8-nido-C2B9H12-).
- The reaction was performed without the need for any transition-metal catalysts.
- A range of nucleophiles, including thioethers, selenides, tellurides, N-heterocycles, phosphates, phosphines, arsenides, and antimonides, were coupled with nido-carboranes.
Main Results:
- The electrochemical method achieved direct B-H functionalization of nido-carboranes with high atom economy.
- Anodic oxidation proved to be an effective and green oxidant, replacing conventional chemical oxidants.
- The transformation exhibited high site-selectivity and efficiency across a variety of heteroatom-containing nucleophiles.
- Successful incorporation of nido-carboranes into drug motifs was demonstrated, highlighting potential pharmaceutical applications.
Conclusions:
- Electrochemical B-H functionalization offers a sustainable and efficient route to derivatized nido-carboranes.
- This method provides a versatile platform for accessing novel carborane-containing compounds.
- The developed protocol facilitates the integration of nido-carboranes into drug discovery programs.
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