Bismabenzene
Bismabenzene is the parent representative of a group of organobismuth compounds that are related to benzene with a carbon atom replaced by a bismuth atom. Bismabenzene itself has been synthesised but not isolated because it is too reactive.
An unstable derivative with 4-alkyl substituents was reported in 1982. A stable derivative was reported in 2016. This derivative has two trisilyl substituents in the ortho positions and was synthesised from aluminacyclohexadiene, bismuth trichloride and DBU.
