Abstract
The title compound, (3)Cp(2)Mg or [Mg(C(14)H(23))(2)], was synthesized from the cor-res-ponding triiso-propyl-cyclo-penta-diene by treatment with n-butyl-sec-butyl-magnesium. The structural characterization by single-crystal X-ray diffraction revealed that the compound crystallizes in the triclinic space group P with half a mol-ecule per asymmetric unit and a staggered arrangement of the cyclo-penta-dienide ligands.