Diboryldiborenes: π-Conjugated B4 Chains Isoelectronic to the Butadiene Dication

Alexander Hermann, Jessica Cid, James D. Mattock, Rian D. Dewhurst, Ivo Krummenacher, Alfredo Vargas*, Michael J. Ingleson, Holger Braunschweig

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


B(sp2)–B(sp3) diborane species based on bis(catecholato)diboron and N-heterocyclic carbenes (NHCs) underwent catechol/bromide exchange selectively at the sp3-hybridized boron atom. The reduction of the resulting 1,1-dibromodiborane adducts led to reductive coupling and isolation of doubly NHC-stabilized 1,2-diboryldiborenes. These compounds are the first examples of molecules exhibiting π-electron delocalization over an all-boron chain.

Original languageEnglish
Pages (from-to)10091-10095
Number of pages5
JournalAngewandte Chemie - International Edition
Issue number32
Early online date15 Jul 2018
Publication statusPublished - 6 Aug 2018


  • boron chains
  • diboranes
  • diborenes
  • N-heterocyclic carbenes
  • π-conjugation


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