title: Cationic Group-IV pincer-type complexes for polymerization and hydroamination catalysis.
abstract: Neutral Zr(IV) and Hf(IV) dimethyl complexes stabilized by unsymmetrical dianionic {N,C,N'} pincer ligands have been prepared from their corresponding bis-amido complexes upon treatment with AlMe₃. Their structure consists of a central ó-bonded aryl donor group (C) capable of forming robust M-C bonds with the metal center, enforced by the synergic effect of both the coordination of peripheral donor groups (N) and the chelating rigid structure of the {N,C,N} ligand framework. Such a combination translates into systems having a unique balance between stability and reactivity. These Zr(IV) and Hf(IV) dimethyl complexes were converted in situ into cationic species [M(IV){N⁻,C⁻,N}Me][B(C₆F₅)₄] which are active catalysts for the room temperature (r.t.) intramolecular hydroamination/cyclization of primary and secondary aminoalkenes as well as for the high temperature ethylene-1-octene copolymerizations.
authors.forename: Lapo
authors.initials: L
authors.lastname: Luconi
authors.forename: Jerzy
authors.initials: J
authors.lastname: Klosin
authors.forename: Austin J
authors.initials: AJ
authors.lastname: Smith
authors.forename: Stéphane
authors.initials: S
authors.lastname: Germain
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Schulz
authors.forename: Jérôme
authors.initials: J
authors.lastname: Hannedouche
authors.forename: Giuliano
authors.initials: G
authors.lastname: Giambastiani