Synthesis of phenyl azonaphthol

The important class of azo dyes comprises more compounds than all other classes of dyes together. The azo compounds form the basis of many dyestuffs and pigments used in the textile, paper and wood industries today.

This Bulletin describes the automated synthesis of phenyl azonaphthol by diazotization of aniline and subsequent azo coupling with 2-naphthol. The 711 Liquino is used to control and monitor the whole process.