Hydrogen Bromide → HCID 23442900, compound

Participants

Reaction Steps

To a solution of 5-acetyl-2,3-dihydrobenzothiophene-1,1-dioxide (8 g, 38.1 mmol) (obtained in preparation 17) dissolved in acetic acid (45 ml) under argon atmosphere, aqueous HBr (0.5 ml, 47%), bromine (5.84 g, 36.54 mmol) was added slowly at 15°-20° C. and the reaction mixture was stirred for about 0.5 h. Additional quantity of bromine (4.84 g) was slowly added and the stirring continued for further 10 h at 25°-30° C. Argon atmosphere was removed and the reaction mixture was kept open in the wave of blowing air in the fuming cup board to eliminate free bromine. The solid separated was filtered and washed with acetic acid (2×10 ml) followed by pet. ether to yield the title compound (10 g, 91%). mp. 68°-70° C.

Provenance & Evidence