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Synthesis of 131I-5 and 211At-6. (A) N-succinimidyl-4-tributylstannyl benzoate, triethylamine, methylene chloride. (B) 211At, N-chlorosuccinimide, acetic acid, methanol, room temp 30 min. (C) Na[1311]N-chlorosuccinimide, acetic acid, methanol, room temp 30 min. (D) Trifluoroacetic acid/water 50°C 30 min or room temperature 60–90 min. PMB = para-methoxybenzyl.
