Isolation of a three-coordinate boron cation with a boron-sulfur double bond

Daniel Franz, Elisabeth Irran, Shigeyoshi Inoue

Research output: Contribution to journalArticlepeer-review

55 Scopus citations


The reaction of the bulky bis(imidazolin-2-iminato) ligand precursor (1,2-(LMesNH)2-C2H4)[OTs] 2 (12+2[OTs] -; LMes=1,3-dimesityl imidazolin-2-ylidene, OTs=p-toluenesulfonate) with lithium borohydride yields the boronium dihydride cation (1,2-(LMesN) 2-C2H4)BH2 [OTs] (2+ [OTs] -). The boronium cation 2+ [OTs] - reacts with elemental sulfur to give the thioxoborane salt (1,2-(LMesN)2-C2H4)BS[OTs] (3+ [OTs] -). The hitherto unknown compounds 12+2[OTs] -, 2+ [OTs] -, and 3+ [OTs] - were fully characterized by spectroscopic methods and single-crystal X-ray diffraction. Moreover, DFT calculations were carried out to elucidate the bonding situation in 2+ and 3+. The theoretical, as well as crystallographic studies reveal that 3+ is the first example for a stable cationic complex of three-coordinate boron that bears a B=S double bond.

Original languageEnglish
Pages (from-to)14264-14268
Number of pages5
JournalAngewandte Chemie International Edition in English
Issue number51
StatePublished - 15 Dec 2014
Externally publishedYes


  • Boron
  • Cations
  • Hydrides
  • Multiple bonds
  • Sulfur


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