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The role of the base in the synthesis of 3′-deoxy-3′-[ 18 F]fluorothymidine, [ 18 F]FLT, via nucleophilic substitution of the nosyl group with [ 18 F]fluoride was investigated. The rate of 18 F-incorporation into the molecule dramatically changed as a function of the precursor-to-base ratio. In the presence of excess base, the precursor was consumed by elimination before...
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