The interaction of nickelocene with 3,6-di-tert-butyl-o-benzoquinone

The interaction of nickelocene with 3,6-di-tert-butyl-o-benzoquinone in toluene gives new 18-electron (η5-Cp)Ni(η3-cyclopentenyl type ligand) complex as the main product of hetero-Diels-Alder reaction. This process being carried out in THF solution is accompanied by ligands exchange and leads mainly to strong paramagnetic complex bis(3,6-di-tert-butyl-o-benzosemiquinonate)-bis(tetrahydrofuran)nickel(II).