Some examples of the diverse research done by chemistry experts include discovery of new medicines and vaccines, improving understanding of environmental issues, and development of new chemical products and materials. 81-16-3, Name is 2-Aminonaphthalene-1-sulfonic acid, molecular formula is C10H9NO3S, COA of Formula: https://www.ambeed.com/products/81-16-3.html, belongs to phthalazine compound, is a common compound. In a patnet, author is Shaterian, Hamid Reza, once mentioned the new application about 81-16-3.
A practical and green method for the synthesis of 2H-indazolo[2,1-b]phthalazine-1,6,11(13H)-trione derivatives using cellulose-SO3H as a solid acidic catalyst for the four-component condensation reaction of hydrazinium hydroxide, phthalic anhydride, dimedone, and aromatic aldehydes under thermal solvent-free conditions is described. Cellulose-SO3H as a recyclable green chemical compound has been demonstrated as a new catalyst for the synthesis of this class of compounds.
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Reference:
Phthalazine – Wikipedia,
,Phthalazine | C8H6N2 – PubChem