2,4-Dimethyl-6-ethoxyquinoline (2), 1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline nitroxide (3), 2,6-dihydro-2,2,4-trimethyl-6-quinone imine N-oxide (4), 2,6-dihydro-2,2,4-trimethyl-6-quinone imine (5), 1,8'-di(1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline) (6) and 1,2-dihydro-6-hydroxy-2,2,4-trimethylquinoline (7) have been prepared from 1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline (1) (ethoxyquin) and their spectroscopic properties (UV, IR, mass and NMR) examined.