Group 4 Metal Complexes of Chelating Cyclopentadienyl-ketimide Ligands

0458000 - ÚFCH JH 2017 RIV US eng J - Článek v odborném periodiku
Večeřa, M. - Varga, Vojtěch - Císařová, I. - Pinkas, Jiří - Kucharczyk, P. - Sedlařík, V. - Lamač, Martin
Group 4 Metal Complexes of Chelating Cyclopentadienyl-ketimide Ligands.
Organometallics. Roč. 35, č. 5 (2016), s. 785-798. ISSN 0276-7333. E-ISSN 1520-6041
Grant CEP: GA ČR(CZ) GA14-08531S; GA MŠMT(CZ) LO1504
Institucionální podpora: RVO:61388955
Klíčová slova: group 4 metal complexes * cyclopentadienyl-ketimide ligands * metallocenes
Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
Impakt faktor: 3.862, rok: 2016

A pendant nitrile group attached to the lithium cyclopentadienide moiety in (C5H4CMe2CMe2CN)Li was alkylated using organyl lithium reagents (RLi, R = Ph, t-Bu, Me), giving rise to dianionic cyclopentadienyl-ketimides [C5H4CMe2CMe2C(R)═N]Li2, which were subsequently utilized as chelating ligands for the synthesis of group 4 bent metallocene or half-sandwich complexes (12 examples of the types [(η5-C5R′5){η5-C5H4CMe2CMe2C(R)═N-κN}MCl], R′ = H or Me, M = Ti, Zr, or Hf, and [{η5-C5H4CMe2CMe2C(R)═N-κN}TiX2], X = Cl or NMe2, respectively, were prepared and characterized). Consecutive protolysis of the intramolecularly bound ketimide moiety in bent metallocenes afforded pendant imine or cationic iminium moieties, respectively, attached to group 4 organometallic fragments. Selected compounds were used as precatalysts in a preliminary screening for ethylene polymerization activity.

Trvalý link: http://hdl.handle.net/11104/0258319