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A chelated borinium cation.

Christopher Major1, Alan Lough1, Douglas W Stephan1,2

  • 1Department of Chemistry, University of Toronto, 80 St George St, Toronto, ON, M5S3H6, Canada. dstephan@chem.utoronto.ca.

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|June 10, 2024
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Summary
This summary is machine-generated.

Researchers synthesized rare two-coordinate boron cations, specifically borinium salts, using a novel reaction pathway. These compounds, featuring bulky organic groups, were isolated and structurally confirmed, advancing the chemistry of low-coordinate boron species.

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Area of Science:

  • Inorganic Chemistry
  • Organoboron Chemistry
  • Synthetic Chemistry

Background:

  • Two-coordinate boron cations are exceptionally rare due to their inherent instability.
  • Previous studies have explored various routes to stabilize low-coordinate boron species, but isolable cationic forms remain elusive.

Purpose of the Study:

  • To synthesize and characterize novel two-coordinate boron cations.
  • To explore the reactivity of boron trifluoride (BF3) with sterically hindered dilithiated diamides.
  • To isolate and structurally elucidate stable borinium salts.

Main Methods:

  • Reaction of BF3 with sterically demanding dilithiated diamides, [RNSiMe2CH2]2B-Li+ (R = Dipp, 1-Ad).
  • Fluoride abstraction from the intermediate [RNSiMe2CH2]2BF using a non-coordinating anion, B(C6F5)4-.
  • Crystallographic characterization of the resulting borinium salt, [(RNSiMe2CH2)2B][B(C6F5)4].

Main Results:

  • Successful synthesis of the two-coordinate boron cation precursor, [RNSiMe2CH2]2BF.
  • Generation and isolation of the stable borinium salt, [(RNSiMe2CH2)2B][B(C6F5)4], featuring bulky Dipp and 1-Ad substituents.
  • Single-crystal X-ray diffraction confirmed the molecular structure of the isolated borinium salt.

Conclusions:

  • The study demonstrates a viable synthetic route to rare two-coordinate boron cations.
  • Steric bulk provided by the R groups (Dipp, 1-Ad) is crucial for the isolation and stability of these borinium salts.
  • This work expands the scope of known low-coordinate boron compounds and provides a foundation for future investigations.