18F-Labeled Octanoates as Potential Agents for Cerebral Fatty Acid Studies. The Influence of 4-Substitution and the Fluorine Position on Biodistribution.
octanoic acid analogs. Radiochemical synthesis was achieved by the nucleophilicdisplacement of a tosylate or mesylate precursor with [18F]fluoride ion. Tissue distribution studies in rats showed low cerebral uptakes of these 18F-labeled fatty acid analogs with poor brain-to-blood ratios. 3-[18F]Fluorooctanoic acid showed considerable defluorination, evident as a high bone activity level. The initial uptake