Tetrahedron Lett., 37, 6551 (1996) lithiation @ -75C occurs at para-position generating an 84% yield of 4-bromo-2,6-difluorobenzoic acid after carboxylation.
• Lithiation with lithium 2,2,6,6-tetramethylpiperidide (LTMP) at -75o occurs at the 4-position, affording 4-bromo-2,6-difluorobenzoic acid in 84% yield after carboxylation: Tetrahedron Lett., 37, 6551 (1996).