O

N h3C. ONa

Y ONa

SO3H

so3h

Phenylhydrazine-p Sodium ethyl l-(p-Sulfophenyl) pyrazolone-

sulfonic acid oxalacetate 3 -carboxylic acid

Stage 2:

Production of the diazotized sulfanilic acid. This reaction was sketched above (synthesis of sunset yellow). Tartrazine is produced by the reaction of the condensation product with the diazotized sulfanilic acid:

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