, s, 1H), 7.91 (s, 1H), 7.71 -7.67 (m, 1H)
, 4,4'-dimethyl-2,2'-bipyridine (25): Following the general procedure using 4,4'-dimethyl-2,2'-bipyridine (442 mg, 2.4 mmol) and 4-bromoaniline (103 mg
, the residue was purified by flash chromatography on silica gel (heptane-EtOAc, 98-2) to afford the desired compound 25 (98 mg, 48%). 1 H NMR (400 MHz
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