Nitric Acid → 4-Hydroxy-1-methyl-3-nitro-1,2-dihydroquinolin-2-one

Participants

Reaction Steps

A suspension of 4-hydroxy-1-methyl carbostyril (1.63g; 0.009 mole) in glacial acetic acid (10 ml) was stirred during the addition of concentrated nitric acid (2.5 ml; d, 1.42) and the mixture heated for a few minutes on a steam bath. On cooling the clear red solution deposited yellow crystals of the title compound which were diluted with ethanol, filtered, and washed well with ethanol, m.p. 159°-161° C (Found: C, 54.20; H 3.71; N, 12.42; C10H8N2O4 requires; C, 54.55 H, 3.66; N, 12.72%).

Provenance & Evidence