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Keywords:

  • boron;
  • borylenes;
  • dehalogenation;
  • reactive species
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The taming of borylene: Dehalogenation of BHCl2IMe (IMe=1,3-dimethylimidazol-2-ylidene) leads to a carbene-stabilized elusive B[BOND]H borylene. A syn-selective [2+1] cycloaddition with naphthalene enabled the isolation and full characterization of the resulting diastereomeric products. These findings along with calculations provide clear evidence for the existence of borylenes (crystal structures: B violet, C black, H gray, N blue).