37435-12-4

Tetrahedron, 50, p. 3529, 1994 DOI: 10.1016/S0040-4020(01)87030-7

In a 250 mL flask, hydrazine hydrochloride (excess) was added to a solution of 3-chloro-2-hydroxybenzaldehyde (36.7 mmol) in EtOH (30 mL). The solution was refluxed for 3 hours. The solvent was distilled under reduced pressure. The residue was purified by