... This compound was previously synthesized in two steps from 3-bromoaniline as an inseparable regioisomeric mixture ... In conclusion, the first synthesis of pure 7-bromoquinolin-2(1H)-one (9) has been described ... 13 C NMR (100 MHz, DMSO-d 6 ): δ = 27.2 (3 CH 3 ), 116.6, 130.0 ...