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Various reactions of no-carrier-added K + -aminopolyether 2.2.2-[ 18 F]fluoride were examined for labelling the CFC-alternative, 2H-heptafluoropropane (HFC 227ea), with the positron-emitting radioisotope, fluorine-18 (t 1 = 109.7 min). Reaction with 2H-hexafluoroisopropyl tosylate incorporated less than 2% of the radioactivity into [2- 18 F]HFC 227ea and...
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