Use of Aliphatic Carboxylic Acid Derivatives for NHC/Photoredox-Catalyzed meta -Selective Acylation of Electron-Rich Arenes

We describe the use of acyl imidazoles derived from ali-phatic carboxylic acids for the N-heterocyclic carbene/organic photore-dox co-catalyzed meta-selective functionalization of electron-richarenes. Compared to our previous work, a change of the wavelength of the applied LED light from 440 nm to 390 nm promotes this reaction efficiently