Scalable electrochemical synthesis of diaryliodonium salts

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Abstract

Cyclic and acyclic diaryliodonium are synthesised by anodic oxidation of iodobiaryls and iodoarene/arene mixtures, respectively, in a simple undivided electrolysis cell in MeCN-HFIP-TfOH without any added electrolyte salts. This atom efficient process does not require chemical oxidants and generates no chemical waste. More than 30 cyclic and acyclic diaryliodonium salts with different substitution patterns were prepared in very good to excellent yields. The reaction was scaled-up to 10 mmol scale giving more than four grams of dibenzo[b,d]iodol-5-ium trifluoromethanesulfonate (>95%) in less than three hours. The solvent mixture of the large-scale experiment was recovered (>97%) and recycled several times without significant reduction in yield.

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Elsherbini, M., & Moran, W. J. (2021). Scalable electrochemical synthesis of diaryliodonium salts. Organic and Biomolecular Chemistry, 19(21), 4706–4711. https://doi.org/10.1039/d1ob00457c

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