Sustainable photocatalytic synthesis of 2-hydroxybenzofuran-3(2H)-ones using lead-free Cs2AgBiBr6 nanocrystals

Herein, lead-free Cs 2 AgBiBr 6 nanocrystals were used to activate O 2 efficiently for the photocatalytic transformation of 4-hydroxycoumarins to 2-hydroxy-benzofuran-3(2 H )-ones in moderate to good yields under an air atmosphere at room temperature.