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As model reactions for the introduction of 18F into protected aromatic amino acids, the replacement of NO2, Cl, Br and F by [18F]fluoride in 2‐isophthalaldehyde and 2‐terephthalaldehyde derivatives which model 18F‐DOPA and 18F‐tyrosine was investigated by comparing labelling yields and reaction rates with those of corresponding mono‐aldehyde compounds. All isophthalaldehydes showed maximum radiochemical...
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