A New Class of Modular Oxazoline-NHC Ligands and Their Coordination Chemistry with Platinum Metals.
Fiche publication
Date publication
décembre 2008
Auteurs
Membres identifiés du Cancéropôle Est :
Dr BELLEMIN-LAPONNAZ Stéphane
Tous les auteurs :
Schneider N, Bellemin-Laponnaz S, Wadepohl H, Gade LH
Lien Pubmed
Résumé
A novel family of enantiomerically pure imidazolium salts [(NHC-Ox)H](+)X(-) (2a-g) has been generated hearing an oxazoline unit and in which both heterocycles are connected by a (dimethyl)m ethylene bridge. Deprotonation of the imidazolium salt 2f and subsequent reaction of the resulting free carbene with [Rh(nbd)Cl](2) (nbd = norbornadiene) afforded the neutral rhodium(I) complex [(NHC-Ox)Rh(nbd)Br] (3) in which the ligand was found to be monodentate. Bromide abstraction lead to the air-stable cationic complex [(NHC-Ox)Rh(nbd)]PF(6) (4) with the expected bidentate coordination mode of the ligand. Reaction of the imidazolium salt 2d with Karstedt's catalyst and one equivalent of KOtBu gave the trigonal planar platinum(0) complex [(NHC-Ox)Pt(dvtms)] (5) (dvtms = divinyltetramethylsiloxane), which was oxidized by CsBr(3) to give the square planar platinum(II) complex [(NHC-Ox)PtBr(2)] (6). Complex [(NHC-Ox)PtCl(2)] (7) was directly prepared by reaction of the imidazolium salt with Ag(2)O followed by the addition of [PtCl(2)(1,5-cod)]. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
Référence
Eur J Inorg Chem. 2008 Dec;36:5587-98.