Light-induced carboxylation of aryl derivatives with cooperative COF as an active photocatalyst and Ni() co-catalyst

The photocatalytic carboxylation of aryl derivatives was demonstrated under CO 2 at atmospheric pressure using a mesoporous covalent organic framework (COF) as the active photocatalyst with triethylamine (TEA) as a sacrificial electron source under visible light. A yield of greater than 91% of the isolated product was achieved with 5 mg of catalyst. The reaction cycle is dependent on the use of the Ni(dmg) 2 co-catalyst and the sacrificial electron donor (TEA). The reaction does not occur in the absence of light (445 nm) even at elevated reaction temperature. We have also demonstrated that a yield of 32% of the isolated product could be obtained with the use of sunlight in the catalytic cycle. Additionally, this heterogeneous catalytic system was recyclable and reusable for several cycles. The photocatalytic carboxylation of aryl derivatives was demonstrated under CO 2 at atmospheric pressure using a mesoporous COF as the active photocatalyst with triethylamine (TEA) as a sacrificial electron source under visible light.