Monocyclopentadienyl and mono(2-methoxyethylcyclopentadienyl) zirconium methyl complexes

Article abstract of DOI:10.1016/S0022-328X(00)00117-0

The reactions of (η⁵-Cp)ZrCl₃(DME) and (η⁵:η¹-Cp°)ZrCl₃ (Cp°=C₅H₄CH₂CH₂OMe) with 1-2 equivalents of MeLi or MeMgI and THF yield the mono- and dimethyl zirconium complexes (η⁵-Cp)ZrCl_3-xMe_x(THF) and (η⁵:η¹-Cp°)ZrCl_3-xMe_x (x=1, 2), respectively. Reaction with three equivalents of MeMgI affords (η⁵-Cp)ZrMe₃(THF) and (η⁵:η¹-Cp°)ZrMe₃. The reaction with three equivalents of MeLi affords (η⁵-Cp)₂ZrMe₂ or (η⁵-Cp°)₂ZrMe₂ and ZrMe₄, as a result of disproportionation. The reaction of (η⁵:η¹-Cp°)ZrMe₃ with B(C₆F₅)₃ in THF affords the cationic zirconium complex [(η⁵:η¹-Cp°)ZrMe₂(THF)][MeB(C ₆F₅)₃]. The chloride-bridged complex [(η⁵:η¹-Cp°)Zr(μ-Cl)Me₂] ₂ was characterized by single-crystal X-ray crystallography.