Monocyclopentadienyl and mono(2-methoxyethylcyclopentadienyl) zirconium methyl complexes

The reactions of (eta(5)-Cp)ZrCl3(DME) and (eta(5):eta(1)-Cp-degrees)ZrCl3 (Cp degrees= C5H4CH2CH2OMe) with 1-2 equivalents of MeLi or MeMgI and THF y ield the mono- and dimethyl zirconium complexes (eta(5)-Cp)ZrCl3-xMex(THF) and (eta(5):eta(1)-Cp degrees)ZrCl3-xMex (x = 1, 2), respectively. Reaction with three equivalents of MeMgI affords (eta(5)-Cp)ZrMe3(THF) and (eta(5): -eta(1)-Cp degrees)ZrMe3. The reaction with three equivalents of MeLi affor ds (eta(5)-Cp)(2)ZrMe2 or (eta(5)-Cp degrees)(2)ZrMe2 and ZrMe4, as a resul t of disproportionation. The reaction of (eta(5):eta(1)-Cp degrees)ZrMe3 wi th B(C6F5)(3) in THF affords the cationic zirconium complex [(eta(5):eta(1- )Cp degrees)ZrMe2(THF)][MeB(C6F5)(3)]. The chloride-bridged complex [(eta(5 ):eta(1)-Cp degrees)Zr(mu-Cl)Me-2](2) was characterized by single-crystal X -ray crystallography. (C) 2000 Elsevier Science S.A. All rights reserved.