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Trimethylaluminum adds to cyclotrimeric zirconocene oxide [Cp 2 ZrO]3 to give the cyclodimeric mixed metal complex [Cp 2 Zr(CH 3 )OAl(CH 3 ) 2 ] 2  (3a-dimer) featuring a central Al 2 O 2  containing four-membered ring system. Complex 3a-dimer crystallizes in space group P2 1 /c with cell parameters a = 8.3974(8), b = 8.6509(7), c = 19.718(1) Å, β = 97.36(1)°, Ζ = 2, R = 0.029, R w  = 0.038. With methylalumoxane 3a-dimer gives an active catalyst (Zr: Al ≈1:8) for ethylene polymerization.

Formation and Structure of [Cp 2 Zr(CH 3 )OAl(CH 3 ) 2 ] 2 — a Neutral Dimethylzirconocene/Alumoxane Adduct