Ytterbium (II) Hydride as a Powerful Multielectron Reductant

A dimeric beta-diketiminato ytterbium(II) hydride affects both the two-electron aromatization of 1,3,5,7-cyclooctatetraene (COT) and the more challenging two-electron reduction of polyaromatic hydrocarbons, including naphthalene (E-0=-2.60 V). Confirmed by Density Functional Theory calculations, these reactions proceed via consecutive polarized Yb-H/C=C insertion and deprotonation steps to provide the respective ytterbium (II) inverse sandwich complexes and hydrogen gas. These observations highlight the ability of a simple ytterbium(II) hydride to act as a powerful two-electron reductant at room temperature without the necessity of an external electron to initiate the reaction and avoiding radicaloid intermediates.

Automated summary

The dimeric beta-diketiminato ytterbium(II) hydride can act as a powerful two-electron reductant at room temperature, affecting the reactions of polyaromatic hydrocarbons such as naphthalene without the need for external electron involvement.