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Imidazole-stabilized, electron-deficient boron cations.

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¹Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 30, D-48149 Münster, Germany. fehahn@uni-muenster.de and Department of chemistry, University of Toronto, 80 St. George St., Toronto, ON, Canada M5S 3H6. dstephan@chem.utoronto.ca.

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Summary

This summary is machine-generated.

New borenium cations exhibit strong Lewis acidity, activating hydrogen and facilitating 1,1-carborations of alkynes under mild conditions. These findings advance organoboron chemistry and catalytic applications.

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Area of Science:

Organometallic Chemistry
Boron Chemistry
Catalysis

Background:

Borenium cations are highly electrophilic boron species.
Lewis acidity is crucial for activating substrates in chemical reactions.
Carboration reactions are important for forming carbon-carbon bonds.

Purpose of the Study:

To synthesize and characterize novel borenium cations.
To investigate the Lewis acidity and reactivity of these new compounds.
To explore their potential in activating hydrogen and catalyzing carboration reactions.

Main Methods:

Synthesis of borenium cations with specific ligands and counterions.
Spectroscopic characterization (NMR, etc.).
Reactivity studies including hydrogen activation and carboration of alkynes.

Main Results:

Successful preparation of borenium cations [(C7H5N2Ad)B(C6F5)2][AlCl4/Al2Cl7] 2a and [(C7H5N2Me)B(C6F5)2][B(C6F5)4] 2b.
Demonstrated high Lewis acidity of the synthesized borenium cations.
Observed capability to activate hydrogen and effect 1,1-carborations of various alkynes under mild conditions.

Conclusions:

The novel borenium cations possess significant Lewis acidity.
These compounds are effective catalysts for hydrogen activation and alkyne carboration.
The findings open new avenues for using borenium cations in organic synthesis and catalysis.