Jan-Feb 1987 Nucleophilic Displacements in Pyridine Rings AD Dunn* and R. Norrie Dundee College of Technology, Bell Street, Dundee, DD1 1HG, Scotland Received April 23, 1986 The reactions of halopyridines containing an electron withdrawing group (-CN, -C02R, -COMe, -N02) with sulphur nucleophiles is reported. 85 /. Heterocyclic Chem., 24, 85 (1987). Halogen atoms in the 2(6) and 4 positions of pyridine rings can easily be replaced by nucleophiles ...