反应详情

3.6 g. of the compound obtained in Example 26 were introduced into 70 ml. concentrated sulphuric acid and stirred for 24 hours at 25° C. Subsequently, the reaction mixture was poured on to ice, neutralized with a concentrated aqueous solution of ammonia, filtered off with suction and well washed with water to give 1.8 g. of the title compound which, after crystallization from ethanol/water, had a melting point of 317°-319° C.

1. additionSubsequently, the reaction mixture was poured on to ice
2. filtrationfiltered off with suction
3. washwell washed with water
4. customto give 1.8 g
5. customof the title compound which, after crystallization from ethanol/water