Chloroform → HCID 178526560, compound

Participants

Reaction Steps

Sodium acetate (52.8 g, 644 mmol) and 4-nitro-1H-indazole (100 g, 613 mmol) were mixed with acetic acid (1000 mL) and chloroform (1000 mL) in a 5 L 4-neck flask with mechanical stirring. A solution of bromine (103 g, 644 mmol) in acetic acid (120 mL) was added over approximately 3.5 hours, while keeping the temperature below 21° C. After the addition was completed, the reaction mixture was stirred for an additional 2 hours. The reaction mixture was concentrated under reduced pressure. Water (2000 mL) was added to the residue. The yellow solids were collected by filtration and washed with water (3×1000 mL). The solids were air-dried on the filter and then under vacuum at 40° C. to give the desired product (129 g) as a yellow solid.

Provenance & Evidence