2-Naphthol → 3-Hydroxy-2-naphthoic acid

Participants

Reaction Steps

An autoclave equipped with stirrer is charged with 1,220 parts of β-naphthol, 640 parts of aqueous sodium hydroxide solution (50% strength by weight) and 6 parts of the trisodium salt of nitrilotriacetic acid (dissolved in 15 parts of water). The charge is mixed thoroughly under nitrogen until the internal temperature reaches 260° C. 510 parts of 2-hydroxy-naphthalene-3-carboxylic acid (corresponding to 73% of theory, based on β-naphthol converted) are obtained analogously to Example 1. The proportion of resin formed is 12 mole percent, based on β-naphthol employed. 685 parts of β-naphthol are recovered.

Provenance & Evidence