title: Synthesis of Complexes with Abnormal "Protic" N-Heterocyclic Carbenes.
abstract: Neutral 4-iodo-N-ethylimidazole 3 oxidatively adds to [Pt(PPh3)4] to give, in the presence of different tetraalkylammonium salts, complexes trans-[4], trans-[5], and trans-[6] containing an anionic C4-bound heterocycle with an unsubstituted ring-nitrogen atom. Complex trans-[4] reacts with the proton source NH4 I under protonation of the ring-nitrogen atom to produce complex trans-[7]I which bears an NH,NR-substituted aNHC ligand. The reaction of trans-[4] with CH3I yields the complex trans-[8]I which has a classical aNHC ligand with two alkylated ring-nitrogen atoms.
authors.affiliation: Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrassee 30, 48149 Münster (Germany).
authors.forename: Hanpeng
authors.initials: H
authors.lastname: Jin
authors.affiliation: Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrassee 30, 48149 Münster (Germany).
authors.forename: Tristan Tsai Yuan
authors.initials: TT
authors.lastname: Tan
authors.affiliation: Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstrassee 30, 48149 Münster (Germany). fehahn@uni-muenster.de.
authors.forename: F Ekkehardt
authors.initials: FE
authors.lastname: Hahn
keywords: N-heterocyclic carbenes; alkylation; oxidative addition; platinum; protonation