Batch and Continuous-Flow Electrochemical Geminal Difluorination of Indeno[1,2- c ]furans.

An electrochemical gem -difluorination of indeno[1,2- c ]furans using commercially available and easy-to-use triethylamine trihydrofluoride as both the electrolyte and fluorinating agent was developed. Remarkably, different reaction pathways of indeno[1,2- c ]furans, i.e., paired electrolysis and net oxidation, are operative in a batch reactor and a continuous-flow microreactor to afford the corresponding gem -difluorinated indanones and indenones, respectively.