The redox reaction between the cycloheptatrienyl-cyclopentadienyl zirconium sandwich complexes [(η7-C7H7)Zr(η5-C5 R5)] [ R = H ( 2a), R = Me ( 2b)] and three equivalents of silver(I) acetate, Ag(OAc), afforded [(η5-C5 R5)Zr(OAc)3] [ R = H ( 6a), R = Me ( 6b)] together with elemental silver and 7,7′-bi-1,3,5-cycloheptatriene ( 5). The molecular structures of 6a and 6b were established by X-ray diffraction analyses, revealing the presence of monomeric half-sandwich complexes with three acetato-κ2 O, O′ ligands. [ABSTRACT FROM AUTHOR]