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±êÌâ      Decarboxylative Ipso Halogenation of Mercury( 11) Pyridinecarboxylates.
            Facile Formation of 3-Iodo- and 3-Bromopyridines
µ¥´Ê      regioisomen     dihalopyridines   picolinate   isonicotinate
              3,5-dihalopyridine     3 -halopyridines    bromodecarboxylation

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