Carboranes with Exopolyhedral Boron-Tetrel Bonds

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.