Boratabenzene rare-earth metal complexes

•Boratabenzenes are heterocyclic 6π-electron aromatic anions.•Boratabenzenes are powerful ligands for rare-earth metal complexes.•Boron atom on the aromatic ring results in unique structural features and reactivity.

Boratabenzenes are heterocyclic 6π-electron aromatic anions that can serve as surrogates of cyclopentadienyl-type ligands in the rare-earth metal chemistry. The synthesis of mono-, bis- and tris(boratabenzene) rare-earth metal complexes, including the divalent and trivalent rare-earth metal derivatives, their halides, amides, and alkyls are summarized in this review. Their structural features, stoichiometric reactivity, and catalytic activity are also presented.

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