Snapshot of the Palladium(II)-Catalyzed Oxidative Biaryl Bond Formation by X-ray Analysis of the Intermediate Diaryl Palladium(II) Complex
作者:Tobias Gensch、Marika Rönnefahrt、Regina Czerwonka、Anne Jäger、Olga Kataeva、Ingmar Bauer、Hans-Joachim Knölker
DOI:10.1002/chem.201103576
日期:2012.1.16
proceeding via a double CH bond activation has been isolated and fully characterized, including an X‐ray crystal structure analysis (see figure). 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 PdII species is regenerated
Pd II 起作用:通过双CH键活化过程进行的Pd II催化的氧化联芳基键形成过程中的二芳基Pd II中间体已被分离并得到了充分表征,包括X射线晶体结构分析(见图) 。由于相邻的新戊酰氧基和乙酰基螯合而产生的稳定作用已使这种长期寻求的关键中间体得以分离。温和加热后,该配合物转变为咔唑产物,而具有催化活性的Pd II物种则通过用Cu II氧化而再生。