TiO<sub>2</sub>‑Catalyzed\nDirect Diazenylation\nof Active Methylene Compounds with Diazonium Salts

Herein, we report\na direct diazenylation of active methylene compounds\nthat is environmentally friendly, cost-effective, and scalable, utilizing\na heterogeneous TiO<sub>2</sub> catalyst that is both accessible and\nrecyclable. The scope of this transformation shows excellent compatibility\nwith both electron-rich and electron-poor diazonium salts, yielding\nthe desired products in very good yields at room temperature.