Modified Methods for the Synthesis of Triazinyl Fluorescent Brightener Intermediates

Abstract

The production of triazinyl fluorescent brightener intermediates in high yields is described. The method involves a simplified work-up for the preparation of 4-nitro-toluene-2-sulfonic acid and the use of diethylene glycol instead of water in the preparation of 4,4'-dinitrostilbene-2,2'-disulfonic acid.

Keywords

• Triazinyl Fluorescent Brighteners
• Sulfonation
• Direct Separation