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Hydroboration with pyridine borane at room temperature.

Julia M Clay1, Edwin Vedejs

  • 1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.

Journal of the American Chemical Society
|April 21, 2005
PubMed
Summary
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New pyridine borane complexes activate alkenes for hydroboration at room temperature. This method offers selective monoadduct formation and easy conversion to useful potassium alkyltrifluoroborate salts.

Area of Science:

  • Organic Chemistry
  • Organoboron Chemistry

Background:

  • Pyridine borane (Py.BH3) is a reagent used in organic synthesis.
  • Hydroboration is a key reaction for functionalizing alkenes.

Purpose of the Study:

  • To develop activated pyridine borane complexes for efficient hydroboration.
  • To investigate the mechanism of this novel hydroboration reaction.
  • To synthesize potassium alkyltrifluoroborate salts from hydroboration products.

Main Methods:

  • Treatment of pyridine borane with iodine, bromine, or strong acids to form Py.BH2X complexes.
  • Reaction of Py.BH2X complexes with alkenes for hydroboration.
  • Conversion of hydroboration products to potassium alkyltrifluoroborate salts using methanolic KHF2.

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Main Results:

  • Activated Py.BH2X complexes effectively hydroborate alkenes at room temperature.
  • Evidence suggests an unusual hydroboration mechanism involving leaving group displacement.
  • Py.BH2I selectively yields monoadducts, unlike THF.BH3.
  • Crude products are readily converted to potassium alkyltrifluoroborate salts.

Conclusions:

  • Activated pyridine borane complexes offer a versatile and selective method for alkene hydroboration.
  • The reaction proceeds via a unique mechanism.
  • The resulting trifluoroborate salts are valuable synthetic intermediates.