A Planar Five-Membered Aromatic Ring Stabilized by Only Two π-Electrons,Angewandte Chemie International Edition

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A Planar Five-Membered Aromatic Ring Stabilized by Only Two π-Electrons
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2022-05-20 , DOI: 10.1002/anie.202206963
Oleksandr Kysliak ₁ , Simon H F Schreiner _{1,

2} , Niklas Grabicki ₃ , Phil Liebing ₁ , Florian Weigend ₄ , Oliver Dumele ₃ , Robert Kretschmer _{1,

2,

5}

Affiliation

Although doubted in the past, two π-electrons are just enough to stabilize five-membered aromatic compounds that are even stable at room-temperature, as shown by the facile synthesis of a dipotassium cyclopentagallene. This compound is a unique example of a five-membered aromatic ring stabilized by only two π-electrons. Single-crystal X-ray diffraction revealed a planar Ga₅ ring with almost equal gallium–gallium bond lengths.

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