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An in‐loop 11C‐carbonylation process for the radiosynthesis of 11C‐carboxylic acids and esters from halide precursors has been developed. The reaction proceeds at room temperature under mild conditions and enables 11C‐carbonylation of both electron deficient and electron rich (hetero)aromatic halides to provide 11C‐carboxylic acids and esters in good to excellent radiochemical yields, high radiochemical...