Sodium Hydroxide → HCID 21506055, compound

Participants

Reaction Steps

A suspension of 4-(4-benzyloxyphenoxy)-3-nitro-5-sulphamyl-benzoic acid (10 g) in water (250 ml) was adjusted to pH 11 by addition of 1N sodium hydroxide. The resulting solution was hydrogenated at room temperature and at 1.1 atmospheres hydrogen pressure after addition of a platinum oxide catalyst (0.4 g). After the hydrogen uptake had become negligible, the catalyst was removed by filtration, and the 3-amino-4-(4-benzyloxyphenoxy)-5-sulphamyl-benzoic acid was precipitated by adjusting the filtrate to pH 2.5 by addition of 4N hydrochloric acid. After recrystallization from aqueous ethanol and drying, the compound was obtained with a melting point of 264°-265° C.

Provenance & Evidence