Crystal structure of 1,1',2,2',4,4'-hexa-iso-propyl-magnesocene.

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.