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Bismabenzene

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Bismabenzene (C5H6Bi) 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 synthesed 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 tri(isopropyl)silyl substituents in the ortho positions and was synthesised from aluminacyclohexadiene, bismuth trichloride and DBU.

References

Bismabenzene Wikipedia