SEARCH Articles Figures Tables 1- formation of pyridines Bonds heteroatom Bonds synthesis C bonds formation synthesis C-heteroatom C-heteroatom bond formation C-ring Formation of C-0 bonds Formation of CS Formation of a,-bonds Formation of bonds Heteroatom Bond Formation Heteroatomic Rings Pyridine bonding Pyridine ring Pyridine synthesis Pyridines formation Pyridinic ring Ring formation Synthesis of Pyridines Synthesis of pyridine ring