LAUSR

The aerobic palladium(II) catalysis presented herein offers facile entry to various substituted phenols through site‐selective C−H hydroxylation of arenes by using sulfoximines as a reusable directing group. The notable aspects of our method include the use of molecular oxygen (O2) as the sole oxidant, the activation of molecular oxygen through aldehyde autoxidation, operational simplicity, and the mechanistic studies into the catalytic C−H hydroxylation process.