Abstract Condensation of vanillin esters of aliphatic acids with 6-aminoquinoline and cyclic c- diketones (1, 3-cyclohexanedione and dimedone) afforded new 2-methoxy-4-(11-oxo-7, 8, 9, 10, 11, 12-hexahydrobenzo [b][4, 7] phenanthrolin-12-yl) phenyl esters of carboxylic acids.