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Synfacts 2025; 21(07): 686
DOI: 10.1055/a-2601-5706
Synthesis of Materials and Unnatural Products

Redox-Stable Cyclic Tetraborane

Contributor(s):
Dahui Zhao
,
Beidi Yu
Beck E, Krummenacher I, Kupfer T, Dietz M, Michel M, Hammond K, Braunschweig H *. Julius-Maximilians-Universität Würzburg, Germany
Structural Stability of a Bent Tetra(amino)tetraborane Ring across Four Charge States.

Chem 2025;
11: 102338
DOI: 10.1016/j.chempr.2024.10.005
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Keywords

cyclic tetraboranes - non-clustered boron - redox chemistry - stable radicals

Significance

A cyclic tetra(amino)tetraborane featuring electron-precise B–B σ-bonds is synthesized and shown to retain its butterfly conformation across four redox states, marking a rare example of classical B–B bonding resilient to charge state changes.


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Comment

The good stability of the B₄ ring with a puckered conformation is reserved across four charge states of 2-, 1-, 0 and 1 + , due to the strong σ(B–B)→π*(B = N) hyperconjugation and steric protection from the amino substituents.


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Publication History

Article published online:
23 June 2025

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