Two in one: A Brønsted acid grafted photoactive covalent organic framework as metal-free dual photocatalyst for aerobic oxidative C-C cleavage

Covalent organic frameworks (COFs) are highly promising photocatalysts with tunable photophysical properties. So far, they have served both as a photosensitizer and solid support. Introducing second catalytic site in the photoactive COF scaffold to form dual photocatalyst is logical next step towards green photocatalytic chemistry by expanding boundaries of visible-light-driven photoredox catalysis. Herein, we present quinoline COF-based which Brønsted acid sites incorporated metal-free for aerobic oxidative C-C bond cleavage cycloalkanones. The activate substrates, while conjugated uses visible light create singlet oxygen actual cleavage. resulting COF-367-SO3H exhibits high activity, broad substrate adaptability, well outstanding recyclability stability due large surface area, permanent porosity, long-range conjugation an orderly arrangement sites. This first report on / another forward development transformations.