38 results about "Naphthol AS" patented technology

Naphthol AS is an organic compound with the formula C₁₀H₆(OH)C(O)NHC₆H₅. It is the anilide of 3-hydroxy-2-carboxynaphthalene. Many analogous compounds are known, designated with a differing suffix. For example, in Naphthol AS-OL, the aryl substituent on nitrogen is C₆H₄-2-OCH₃. These compounds are used as coupling partners in the preparation of some azo dyes.