Black Phosphorous as a Metal-Free, Visible-Light-Active Heterogeneous Photoredox Catalyst for the Direct C-H Arylation of Heteroarenes

Black phosphorus (BP) is for the first time employed as a metal-free, heterogenous photoredox catalyst for direct C-H arylation of heteroarenes with aryl diazonium salts. The arylated heteroarenes are obtained in moderate to good yields under visible-light illumination, and the protocol is shown to be applicable for the scale-up synthesis.