Methane → Disodium 4-aminonaphthalene-2,7-disulfonate

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Reaction Steps

A 151.7 g portion of 1-amino-3,6-naphthalenedisulfonic acid is added with stirring to 200 ml of water containing 44 g of sodium hydroxide. This solution is treated with activated charcoal and filtered. To the filtrate is added ethyl alcohol with the formation of a precipitate which is allowed to stand. The solid is collected by filtration and set aside. More ethyl alcohol is added to the filtrate with the formation of additional product. This product is collected after standing and is combined with the material previously set aside. The combined product is dissolved in water, treated with activated charcoal and is recrystallized from ethyl alcohol. The product is collected by filtration, washed with absolute ethyl alcohol and is dried to give 1-amino-3,6-naphthalenedisulfonic acid disodium salt.

Provenance & Evidence