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 aliphatic carboxylic acids for the N-heterocyclic carbene/organic photoredox co-catalyzed meta -selective functionalization of electron-rich arenes. 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. [ABSTRACT FROM AUTHOR]