title: Snapshot of the palladium(II)-catalyzed oxidative biaryl bond formation by X-ray analysis of the intermediate diaryl palladium(II) complex.
abstract: Pd(II) caught in the act: The diaryl Pd(II) intermediate of a Pd(II)-catalyzed oxidative biaryl bond formation proceeding via a double C-H bond activation has been isolated and fully characterized, including an X-ray crystal structure analysis. Stabilization due to chelation by adjacent pivaloyloxy and acetyl groups has allowed the isolation of this long-sought crucial intermediate. On gentle warming, the complex is transformed into a carbazole product, and the catalytically active Pd(II) species is regenerated by oxidation with Cu(II).
authors.affiliation: Department of Chemistry, Technische Universität Dresden, Bergstraße 66, 01069 Dresden, Germany.
authors.forename: Tobias
authors.initials: T
authors.lastname: Gensch
authors.forename: Marika
authors.initials: M
authors.lastname: Rönnefahrt
authors.forename: Regina
authors.initials: R
authors.lastname: Czerwonka
authors.forename: Anne
authors.initials: A
authors.lastname: Jäger
authors.forename: Olga
authors.initials: O
authors.lastname: Kataeva
authors.forename: Ingmar
authors.initials: I
authors.lastname: Bauer
authors.forename: Hans-Joachim
authors.initials: HJ
authors.lastname: Knölker