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Radio-TLCs of attempted radiobrominations of 4 and a control reaction (performed in the absence of 4), showing formation of unknown #1 and unknown #2. (A) Attempted radiobromination of 4, using PAA; (B) Control reaction using PAA but no substrate 4; (C) Attempted radiobromination of 4, using CAT. Separations were on silica gel, 1:1 ethyl acetate/hexanes.
