The synthesis of a number of analogues of ethoxyquin and their evaluation as antioxidants in fish oil .2.

The synthesis, spectral data and antioxidant efficacies of four compounds related to ethoxyquin (1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline) are described. Two of the compounds, namely 1,2-dihydro-2,2,4-trimethylquinoline and 1,2-dihydro-6-allyloxy-2,2,4-trimethylquinoline were less effective and two, namely 1,2-dihydro-6-hydroxy-2,2,4-trimethylquinoline and 1,2,6,7-tetrahydro-2,2,4,7,7,9-hexamethylpyrido (2,3-g) quinoline were more effective as antioxidants in fish oil than ethoxyquin.