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para -Chlorotetrafluorophenyl-boranes - syntheses and structures of a series of mono- and bidentate Lewis acids.

Christian BeckerPia C TrappBeate NeumannHans-Georg StammlerNorbert W Mitzel
Published in: Dalton transactions (Cambridge, England : 2003) (2022)
Mono- and bidentate tri-coordinated boron compounds bearing the yet unexplored para -chlorotetrafluorophenyl substituent have been synthesized and structurally investigated. The acidity of tris( para -chlorotetraphenyl)borane (7) was shown to exceed that of the widely used tris(pentafluorophenyl)borane (BCF) according to the Gutmann-Beckett method. Acid-base adducts of 7 with diethyl ether and triethylphosphine oxide were crystallized. Dihydrogen splitting at room temperature was observed with a Frustrated Lewis Pair consisting of 7 and 2,2,6,6-tetramethylpiperidine (TMP). The hydrogen adduct was isolated and characterized by NMR, SC-XRD and elemental analysis. Its solid-state structure contains a H⋯H distance on the verge of dihydrogen bonding (2.28(6) Å). Bis( para -chlorotetrafluorophenyl)hydridoborane was prepared in situ and shown to be applicable in hydroboration reactions similarly to Piers' borane.
Keyphrases
  • solid state
  • room temperature
  • ionic liquid
  • high resolution
  • magnetic resonance
  • oxide nanoparticles
  • visible light
  • data analysis