反应详情

An aqueous solution of sodium nitrite (337 mg, 4.89 mmol) in water (2 mL) was added dropwise to a suspension of 1H-indazol-4-ylamine (631 mg, 4.74 mmol) in 6M hydrochloric acid (7.2 mL) at below 0° C. After stirring for 30 minutes sodium tetrafluoroborate (724 mg) was added. The reaction mixture became very thick and was filtered and washed briefly with water to yield 1H-indazole-4-diazonium, tetrafluoroborate salt (69) (218 mg, 20%) as a deep red solid.

1. additionwas added
2. filtrationwas filtered
3. washwashed briefly with water