Abstract

AbstractPreparation of radiolabeled [125I]‐N,N′‐bis(2,3‐dihydroxypropyl)‐5‐(3‐hydroxy‐2‐oxo‐1‐piperidinyl)‐2,4,6‐ triiodo‐1,3‐benzenedicarboxamide, ([125I]‐3H2‐iopiperidol‐A), a nonionic radiographic contrast agent, was achieved by HAuCl4 mediated exchange radioiodination. [125I]‐Iopiperidol‐A was isolated by reversed‐ phase HPLC in 83% radiochemical yield. The radiochemical purity of isolated [125I]‐3H2‐iopiperidol‐A was 98.7% and the specific activity was 6.6 mCi/μmol. The role of HAuCl4 in facilitating exchange radioiodination of 3H2‐iopiperidol‐A, however, appears to be a complex process not limited to the production of electrophilic iodine ion.

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