Red-Light-Driven C(sp 2 )–H Sulfonylation of Anilines Using a Recyclable Benzothiadiazole-Based Covalent Organic Framework

)-H sulfonylation of anilines using a highly stable benzothiadiazole-based covalent organic framework (Tp-BT COF) as an efficient, recyclable photocatalyst. The reaction proceeds under exceptionally mild conditions, affording sulfonylated products in good to excellent yields with minimal catalyst loading. Notably, the Tp-BT COF retains its catalytic activity over six consecutive cycles. Comparative studies with structurally related COFs highlight the critical role of the BT core in red-light absorption and the superior performance of the AA stacking mode. This work underscores the potential of rationally designed photoactive COFs for sustainable red-light photocatalysis.