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Keywords:

  • boron;
  • multiple bonds;
  • N-heterocyclic carbenes;
  • reduction;
  • silver
Thumbnail image of graphical abstract

(B)olefin complexes: Reductive coupling of designed monoborane precursors (see scheme; Dur=2,3,5,6-tetramethylphenyl) gives convenient access to N-heterocyclic carbene stabilized diborenes. The presence of B[BOND]B multiple bonds in the dark red diborenes is shown experimentally and theoretically. Reaction with AgCl afforded a AgI species with an unprecedented, olefin-like η2 coordination mode.