Hydroxyamine hydrochloride → 2,3-Dichloro-4-hydroxy-4'-fluorobenzophenone oxime

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Reaction Steps

To a solution of 35 g of 2,3-dichloro-4-hydroxy-4'-fluorobenzophenone in 250 ml pyridine, 34.6 g of hydroxylamine HCl is added. The mixture is refluxed for 4 hours. The pyridine is evaporated in vacuo. The residue is partitioned between 5% HCl and ethyl acetate. The ethyl acetate extract is washed with water, dried over Na2SO4 and evaporated to give 2,3-dichloro-4-hydroxy-4'-fluorobenzophenone oxime as a mixture of isomers, mp 150°-156° C.

Provenance & Evidence