Derivate der 5-(Pyridyl-2-oxy)-2-nitrobenzoesäure, deren Herstellung und sie enthaltende herbizide Mittel
申请人:CIBA-GEIGY AG
公开号:EP0024259B1
公开(公告)日:1985-07-31
A tautomeric ligand enables directed C‒H hydroxylation with molecular oxygen
作者:Zhen Li、Zhen Wang、Nikita Chekshin、Shaoqun Qian、Jennifer X. Qiao、Peter T. Cheng、Kap-Sun Yeung、William R. Ewing、Jin-Quan Yu
DOI:10.1126/science.abg2362
日期:2021.6.25
challenging when oxygen is used as the oxidant. Here, we report a palladium complex bearing a bidentate pyridine/pyridone ligand that efficiently catalyzes this reaction at ring positions adjacent to carboxylic acids. Infrared, x-ray, and computational analysis support a possible role of ligand tautomerization from mono-anionic (L,X) to neutral (L,L) coordination in the catalytic cycle of aerobic carbon–hydrogen