Ring Expansion of a Cp* Moiety: Formation of a 1,2-Diphosphacyclooctatetraene Ligand [Ringerweiterung einer Cp*-Einheit - Bildung eines 1,2-Diphosphacyclooctatetraen-Liganden]

Abstract

Not as innocent as it looks: Reaction of the phosphinidene complex 1 with tBuCP leads, via a WP triply bound intermediate, to the diphosphabutenonyl ligand complex 2, whereas the reaction with MesCP (Mes=2,4,6-Me3C6H2) leads, through an unprecedented ring opening of the innocent Cp* ligand (Cp*=C5Me5) and insertion of the phosphaalkyne and the phosphinidene P atom, to the novel diphosphacyclooctatetraene ligand complex 3.