Bromine → HCID 13712336, compound

Participants

Reaction Steps

About half volume of 10 ml of solution of 3.9 g of bromine in acetic acid is added dropwise to a solution of 5 g of 9-chloro-2-phenyl-4,4a,5,6-tetrahydrobenzo[h]cinnolin-3(2H)-one in 150 ml of acetic acid with stirring at room temperature. After the mixture is heated up to 50° C. on a water bath, the remaining solution is added dropwise. After stirring under heating at 50° C. for 2 hours, the precipitated crystals are collected by filtration, washed with water and recrystallized from ethanol to give 2.7 g of 9-chloro-2-phenyl-5,6-dihydrobenzo[h]cinnolin-3(2H)-one as yellow leaflets, melting at 184°-186° C.

Provenance & Evidence