Di-tert-butylmagnesium:  Synthesis and Structure

The synthesis and structure characterization of tBu2Mg is reported. The X-ray structure and variable-temperature 1H and 13C NMR spectra and the molecular weight measurements show that the title compound occurs as a dimer with a folded CMg(μ-C)2MgC skeleton in the solid state and solution. A detailed inspection of the crystal structures of [tBu2Mg]2 reveals that intra- and intermolecular CH3···Mg agostic interactions play a substantial role in the molecular assembly.