Nitric Acid → N-Acetyl-7-cyano-5-nitroindoline

Participants

Reaction Steps

To a mixed solution of acetic acid (3.8 ml), concentrated sulfuric acid (4.7 ml) and funing nitric acid (0.8 ml), under cooling with stirring, were added only small portions of N-acetyl-7-cyano-indoline (2.42 g). After stirred at the temperature as such for 7.5 hours, the reaction mixture was poured into ice-water (50 ml). The deposited crystal was collected by filtration, washed with water and acetone, and then dried to give the intended compound 2.6 g (66.7%) as white powder. M.P.: 245°-255° C.

Provenance & Evidence