Abstract
AbstractThe synthesis, structures, and ring‐opening polymerization (ROP) activity of new dimethyl‐ansa‐ and ‐non‐ansa‐zirconocene complexes are reported. The substituted indene precursors 1‐C9H7R [R = CH3 (1), CH2Ph (2) and C2H4(C4H7O2) (3)] were synthesised by treating RBr [R = CH2Ph and C2H4(C4H7O2)] or MeI with indenyllithium. Likewise, bridged indenyl/cyclopentadiene compounds [Me2Si(3‐C9H6R)(C5Me4H)] [R = H (4), CH3 (5), CH2Ph (6) and C2H4(C4H7O2) (7)] were obtained by treating the lithium salt of the appropriately substituted indene with ClSiMe2(C5Me4H). ansa‐Indenyl–cyclopentadienylmetallocenes [Zr{Me2Si(3‐η5‐C9H5R)(η5‐C5Me4)}Cl2] [R = H (8), CH3 (9), CH2Ph (10), C2H4(C4H7O2) (11)] were subsequently obtained by treating the dilithium salts of the corresponding ligands with ZrCl4 in toluene. The dimethyl derivatives [Zr{Me2Si(3‐η5‐C9H5R)(η5‐C5Me4)}Me2] [R = H (12), CH3 (13), CH2Ph (14), C2H4(C4H7O2) (15)] were prepared by treating the corresponding ansa‐zirconocene dichloride complex with MgMeBr. Dialkyl derivative [Zr{Me2Si{3‐η5‐C9H5(CH2Ph)}(η5‐C5Me4)}(CH2SiMe3)2] (16) was prepared by adding 2 equiv. of LiCH2SiMe3 to complex 10. Mixed indenyl/cyclopentadienylzirconocene complexes [Zr(η5‐C9H6R)(η5‐C5H5)Cl2] [R = H (17), C2H4(C4H7O2) (18)] were prepared by treating the lithium salt of the appropriately substituted indene with [Zr(η5‐C5H5)Cl3]. Likewise, dimethyl derivatives [Zr(η5‐C9H6R)(η5‐C5H5)Me2] [R = H (19), C2H4(C4H7O2) (20)] were prepared by treating the corresponding mixed indenyl/cyclopentadienyl dichloride complex with 2 equiv. of MgMeBr. The X‐ray crystal structures of 7, 12, and 13 were also established. Finally, comparative catalytic studies of zirconium complexes 12–16, 19 and 20 in ROP reactions of ϵ‐caprolactone are described.
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