Examining the substate scope with SMC as reagent revealed a similar reactivity trend as observed with gaseous CO2. With the exception of derivatives 1i and 1q with multiple donating groups, all other aryl bromides afforded the corresponding acids albeit in lower yields than with CO2. Thus here, the best result was achieved in the formation of 2-toluic acid (2b), which was obtained in 51% yield. Fluoro and methoxy substituents were tolerated equally well independent of their position on the aryl group. Interestingly, 2-methoxyphenyl bromide (1p) was transformed into the respective acid (2p) in 25% yield compared to only traces in the reactions with CO2. Also with SMC, ketones 3 were detected, but generally, isolation led to only trace amounts of these side products.