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4 solution according to the procedure reported by Hart and Rajakumar (Ref. 6b), we unexpectedly found that the products were contaminated with the corresponding bromides 6-8 (Br instead of I). Additional experiments revealed that this phenomenon was common to the syntheses of other 2′-I substituted m-terphenyls by the Hart reaction, although the unusual reactivity could not be explained within our knowledge. It is important to add iodine as a THF solution (or without solvent) for facile transformation into the iodides.
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