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A solution of 22 ml. fuming nitric acid in 200 ml. 80% sulphuric acid is added dropwise, with cooling, to a solution of 100 g. (0.62 mol) 3,3-dimethylindolin-2-one in 500 ml. 80% sulphuric acid. The reaction mixture is then stirred for about 30 minutes, poured on to ice, filtered with suction, washed with water and dried. Yield: 100 g. (78% of theory); m.p. 192°-196° C. (ethyl acetate/heptane).

1. temperaturewith cooling, to a solution of 100 g
2. additionpoured on to ice
3. filtrationfiltered with suction
4. washwashed with water
5. customdried