The Hückel rule defines that monocyclic and planar conjugated systems containing [4n + 2] π electrons are aromatic. Here, the authors highlight boron species that feature a globally 4n π system, defying the Hückel rule, but nonetheless exhibit aromaticity.

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The Hückel rule defines that monocyclic and planar conjugated systems containing [4 n + 2] π electrons are aromatic. Here, the authors highlight boron species that feature a globally 4 n π system, defying the Hückel rule, but nonetheless exhibit aromaticity.

The cation still has three 2c-2e. B–B bonds.

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