Refine
Has Fulltext
- yes (12)
Is part of the Bibliography
- yes (12)
Document Type
- Preprint (8)
- Journal article (4)
Language
- English (12)
Keywords
- boron (8)
- diborenes (7)
- carbenes (4)
- Boron (3)
- Aromaticity (2)
- Biradicals (2)
- Cycloaddition (2)
- Diborane (2)
- Multiple bonds (2)
- conjugation (2)
Institute
Sonstige beteiligte Institutionen
EU-Project number / Contract (GA) number
- 669054 (12) (remove)
sp\(^2\)–sp\(^3\) diborane species based on bis(catecholato)diboron and N-heterocyclic carbenes (NHCs) are subjected to catechol/bromide exchange selectively at the sp\(^3\) 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 pelectron delocalization over an all-boron chain.
Unsaturated bridges that link the two cyclopentadienyl ligands together in strained ansa metallocenes are rare and limited to carbon-carbon double bonds. The synthesis and isolation of a strained ferrocenophane containing an unsaturated two-boron bridge, isoelectronic with a C=C double bond, was achieved by reduction of a carbene-stabilized 1,1’-bis(dihaloboryl)ferrocene. A combination of spectroscopic and electrochemical measurements as well as density functional theory (DFT) calculations was used to assess the influence of the unprecedented strained cis configuration on the optical and electrochemical properties of the carbene-stabilized diborene unit. Initial reactivity studies show that the dibora[2]ferrocenophane is prone to boron-boron double bond cleavage reactions.