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Effective methods are needed for labelling acyclic ureas with carbon‐11 (t1/2=20.4 min) as potential radiotracers for biomedical imaging with positron emission tomography (PET). Herein, we describe the rapid and high‐yield syntheses of unsymmetrical acyclic [11C]ureas under mild conditions (room temperature and within 7 min) using no‐carrier‐added [11C]carbonyl difluoride with aliphatic and aryl amines...
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