Kim, Daeun; Choi, Geunho; Kim, Weonjeong; Kim, Dongwook; Kang, Youn K.; Hong, Soon Hyeok published their research in Chemical Science in 2021. The article was titled 《The site-selectivity and mechanism of Pd-catalyzed C(sp2)-H arylation of simple arenes with aryl bromides.》.COA of Formula: C7H9BO3 The article contains the following contents:
Herein, comprehensively investigated the scope, site-selectivity and mechanism of the Pd-catalyzed direct C-H arylation reaction of simple arenes with aryl bromides. Counterintuitively, electron-rich arenes preferably proceeded through meta-arylation without an need for a specifically designed directing group, where as electron-deficient arenes bearing fluoro or cyano groups exhibited high ortho-selectivity and electron-deficient arenes bearing bulky electron-withdrawing groups favored the meta-product. Comprehensive mechanistic investigations through a combination of kinetic measurements and stoichiometric experiments using arylpalladium complexes were revealed that the Pd-based catalytic system works via a cooperative bimetallic mechanism, not the originally proposed monometallic CMD mechanism, regardless of the presence of a strongly coordinating L-type ligand. Notably, the transmetalation step, which was influenced by a potassium cation were suggested as the selectivity-determining step. In the experiment, the researchers used 3-Methoxyphenylboronic acid(cas: 10365-98-7COA of Formula: C7H9BO3)
3-Methoxyphenylboronic acid(cas: 10365-98-7) belongs to boronic acids. Boronic acids are mild Lewis acids which are generally stable and easy to handle, making them important to organic synthesis.COA of Formula: C7H9BO3
Referemce:
Ether – Wikipedia,
Ether | (C2H5)2O – PubChem