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General procedure for the synthesis of 4′-substituted bis(alkanoyloxymethyl) 2,2′:6′,2″-terpyridine-6,6″-dicarboxylate. 4′-Substituted 2,2′:6′,2″-terpyridine-6,6″-dicarboxylic acid in DMF was reacted with halomethyl alkanoate in the presence of Et3N or i-Pr2EtN at 50°C or 60°C. Purification using SiO2 gel column chromatography afforded 4′-substituted bis(alkanoyloxymethyl) 2,2′:6′,2″-terpyridine-6,6″-dicarboxylate (Step-A)
