Hydroxylamine → 2-Hydroxyimino-2-(3-hydroxyphenyl)acetic acid

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Reaction Steps

A mixture of 3-hydroxyphenylglyoxylic acid (3.32 g.) and 1 N-methanol solution of hydroxylamine (45 ml.) was refluxed with stirring, for 25 minutes. The reaction mixture was concentrated to dryness. The residue was dissolved in 1 N-sodium hydroxide aqueous solution (50 ml.) and the solution was washed with ether, acidified with hydrochloric acid under cooling and extracted with ethyl acetate. The extract was washed with a saturated sodium chloride aqueous solution, dried and concentrated to give yellow oil. To the oil was added benzene and benzene was distilled off. The residue was crystallized with petroleum ether and the crystals were collected by filtration, washed with petroleum ether and dried to give 2-hydroxyimino-2-(3-hydroxyphenyl)acetic acid (a mixture of syn and anti isomer) (2.9 g.).

Provenance & Evidence