exo‐2‐(η6‐Hexamethylbenzene)‐endo‐2‐chloro‐2‐ruthena‐arachno‐tetraborane(8)

The compound exo-2-(η 6 -hexamethylbenzene)-endo-2-chloro-2-ruthena-arachno-tetraborane, [RuCl(C 12 H 18 )(B 3 H 8 )], is based on a four-vertex butterfly structure with an Ru atom occupying a wing-tip position. The Ru atom is coordinated to the [B 3 H 8 ] moiety via an Ru-μ-H-B bridge to each of the two B atoms in the hinge positions. Additionally, the Ru atom is ligated by a hexahapto-hexamethylbenzene and a Cl atom. The compound is in a conformation with the Cl atom in the endo position and the η 6 -arene in the exo position.