The title compound, -mu-oxo-tris[bis(eta5-cyclo-pentadienyl)zirconium]
benzene solvate, obtained from the reaction of zirconocene hydride wi
th CO2, is shown to contain planar Zr3O3 cycles with comparatively sho
rt Zr-O distances [1.959 (5)-1.976 (5) angstrom] as a result of partia
l double bonding.