title: Nacnac(Bn)MgOtBu: a diketiminate-based catalyst for the polymerisation of rac-lactide with slight isotactic preference.
abstract: The reaction of N,N'-dibenzyl-2-amino-4-imino-pent-2-ene, nacnac(Bn)H, with 1 or 2 equiv. of MgnBu₂ afforded the homoleptic complex nacnac(Bn)₂Mg. The reaction of nacnac(Bn)H with Mg(N(SiMe₃)₂)₂ yielded nacnac(Bn)MgN(SiMe₃)₂, which reacted with tert-butanol to form nacnac(Bn)MgOtBu. The latter complex crystallizes as an alkoxide bridge dimer and is active in the ring-opening polymerisation of rac-lactide. Polymerisations at room temperature afforded atactic polylactide, while polymerisations at -17 and -26 °C afforded polylactide with a small isotactic bias (P(m) = 0.52, and 0.55, respectively).
authors.affiliation: C. P. 6128 Succ. Centre-Ville, Montréal, QC H3C 3J7, Canada.
authors.forename: Frédéric
authors.initials: F
authors.lastname: Drouin
authors.forename: Todd J J
authors.initials: TJ
authors.lastname: Whitehorne
authors.forename: Frank
authors.initials: F
authors.lastname: Schaper
mesh_terms: D002384:Catalysis; D018360:Crystallography, X-Ray; D004146:Dioxanes / Q000737:chemistry*; D017616:Magnesium Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011091:Polyesters / Q000737:chemistry; D058105:Polymerization; D013237:Stereoisomerism; D013696:Temperature
chemical_list: D004146:Dioxanes; D017616:Magnesium Compounds; D011091:Polyesters; C033616:poly(lactide); C091880:dilactide