Nitric Acid → HCID 21504774, compound

Participants

Reaction Steps

1.6 gm (4.5 millimols) of 2-carboxy-4-oxo-6,6-dimethyl-12-chloro-4H,6H-[2]-benzopyrano-[3,4-f]-[1]-benzopyran (see Example 6) were stirred for 24 hours in a mixture of 35 ml of acetic acid and 5 ml of fuming nitric acid. The yellow precipitate formed thereby was filtered off and recrystallized from methanol/acetone. 1.5 gm (83.3% of theory) of the compound named in the heading, m.p. 278°-279° C, were obtained.

Provenance & Evidence