Highly efficient heterogenous catalyst for O-arylation of phenols with aryl halides using natural ferrous chamosite

► Natural ferrous chamosite, a naturally occurring marine clay serves as a catalyst. ► Catalyst for C-O bond formation for the synthesis of a wide variety of diaryl ethers. ► Recyclable and efficient catalyst with consistent activity. ► This ligand-free, natural catalyst catalyzed coupling of aryl iodides and aryl bromides with phenols. ► Affords excellent possible atomic economy when accounted with respect to substrate and product.