Abstract

The thermal conversion of commo-{1-(Cp*Ru)(μ-H)B4H9}2Ru, 1, into {(η5-C5Me5)Ru}2{η6-C6H6)Ru}B7H7}, 2, is described. Compound 2 is a single cage, hypoelectronic triruthenaborane in which the C6H6 ligand is derived from the reaction solvent. As an (n − 1) skeletal electron pair (sep) closed, deltahedral cluster, 2 constitutes a structural link between 10 fragment metallaboranes with (n + 1) and (n) sep as well as with one with (n − 2) sep. This series establishes a connection between decreasing average coordination number of the cluster boron atoms with decreasing sep thereby providing a useful 11B NMR chemical shift correlation.

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