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Carboranes with Exopolyhedral Boron-Tetrel Bonds.

Andrew J Baublis¹, Tyler A Kerr¹, Milan Gembicky²

¹Department of Chemistry and Biochemistry, University of California, Los Angeles, 607 Charles E. Young Drive East, Los Angeles, CA 90095, USA.

Organometallics

|December 8, 2025

Summary

Boron-bound icosahedral carboranes offer stable, tunable substituents for main group chemistry. This study introduces carborane derivatives of group 14 elements, expanding synthetic possibilities for non-transition metal centers.

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Area of Science:

Organometallic Chemistry
Main Group Chemistry
Boron Chemistry

Background:

Diversification of substituents is crucial for developing main group element species.
Stable and tunable substituents are needed to control reactivity at non-transition metal centers.
Traditional alkyl and aryl groups have limitations in certain applications.

Purpose of the Study:

To introduce boron-bound icosahedral carboranes as novel substituents for group 14 elements.
To synthesize and characterize new carborane-containing organometallic compounds.
To demonstrate the versatility of carboranes in main group element chemistry.

Main Methods:

Salt melt synthesis was employed for creating carborane-substituted stannane and germane species.
B-mercuro-carborane was used as a key starting material.
Grignard reagents were utilized for derivatization of the synthesized compounds.

Main Results:

The synthesis of B(9)-carboranyl stannane was achieved.
The first reported B(9)-carboranyl germane species was synthesized.
Germanium species with di- and tri-substituted carboranes were successfully prepared, demonstrating synthetic generality.

Conclusions:

Boron-bound icosahedral carboranes serve as effective, tunable substituents for group 14 elements.
The salt melt synthetic method is a versatile approach for generating carborane derivatives.
This work expands the scope of main group element chemistry with novel carborane-based compounds.