C07C309/41 - CPC Classification

Sulfonic acids; Halides, esters, or anhydrides thereof; Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing singly-bound oxygen atoms bound to the carbon skeleton

• C07C309/42 » having the sulfo groups bound to carbon atoms of non-condensed six-membered aromatic rings 89
• C07C309/43 » having at least one of the sulfo groups bound to a carbon atom ofa six-membered aromatic ring being part of a condensed ring system 27

Recent Application in this class: