Electrocatalytic Reduction of (Hetero)Aryl Halides in a Proton‐Exchange Membrane Reactor and its Application for Deuteration

Abstract We developed an electrocatalytic reduction of (hetero)aryl halides under mild conditions using a proton exchange membrane (PEM) reactor. This approach allows substituting the halogeno groups on aryl rings to protons by water and electron. Taking advantage this transformation, deuterodehalogenation halides, which forms mono‐deuterated (hetero)aryls, was demonstrated heavy as deuterium source. The current efficiency ratio could be increased optimized machine‐learning method, Bayesian optimization.