Di-<i>tert</i>-butylmagnesium:  Synthesis and Structure StarowieyskiKazimierz B. LewinskiJanusz WozniakRobert LipkowskiJanusz ChrostAndrzej 2003 The synthesis and structure characterization of <sup>t</sup>Bu<sub>2</sub>Mg is reported. The X-ray structure and variable-temperature <sup>1</sup>H and <sup>13</sup>C NMR spectra and the molecular weight measurements show that the title compound occurs as a dimer with a folded CMg(μ-C)<sub>2</sub>MgC skeleton in the solid state and solution. A detailed inspection of the crystal structures of [<sup>t</sup>Bu<sub>2</sub>Mg]<sub>2</sub> reveals that intra- and intermolecular CH<sub>3</sub>···Mg agostic interactions play a substantial role in the molecular assembly.