反应详情

4-methoxy-8-nitro-1-formyl dibenzo[b,d]furan (1.1 gm, 0.0034 mol) in acetone (5 ml) was heated to 60–70° C. for 10 min. To the above suspension was added dropwise a hot solution of potassium permanganate (1.07 gm, 0.0068 mol) in water: acetone (1:3) (15 ml) for 10 min. The reaction was heated to 60–70° C. for 10 min., cooled to room temperature and filtered. The residue washed with acetone and the filterate was extracted with 10% sodium hydroxide solution. Acidification, followed by filteration and washing of the precipitate yielded 4-methoxy-8-nitro-dibenzo[b,d]furan-1-carboxylic acid (0.6 gm) as white solid; mp: 178° C. (dec.)

1. temperatureThe reaction was heated to 60–70° C. for 10 min.
2. filtrationfiltered
3. washThe residue washed with acetone
4. extractionthe filterate was extracted with 10% sodium hydroxide solution
5. washwashing of the precipitate