A formal Cu-catalyzed C(sp2)-H hydroxylation assisted by benzoic acids is described. The procedure is characterized by its mild reaction conditions and wide substrate scope utilizing simple and cheap Cu catalysts, thus becoming a user-friendly and operationally simple protocol for C(sp2)-H hydroxylation.
![Cu-Catalyzed Mild C(sp2)-H Functionalization Assisted by Carboxylic Acids en Route to Hydroxylated Arenes](https://www.iciq.org/wp-content/uploads/2014/03/Cu-Catalyzed-Mild-Csp2_ja-2013-047894_0010.gif)