104946-10-3

Basic information

• Product Name: 3-Hydroxy-4-([1,3,4]thiadiazol-2-ylazo)-naphthalene-2,7-disulfonic acid
• CAS NO: 104946-10-3
• Molecular Weight: 416.416
• Mol File: 104946-10-3.mol
• Article Data: 1

Chemical Properties

• CAS DataBase Reference: 3-Hydroxy-4-([1,3,4]thiadiazol-2-ylazo)-naphthalene-2,7-disulfonic acid(CAS DataBase Reference)
• NIST Chemistry Reference: 3-Hydroxy-4-([1,3,4]thiadiazol-2-ylazo)-naphthalene-2,7-disulfonic acid(104946-10-3)
• EPA Substance Registry System: 3-Hydroxy-4-([1,3,4]thiadiazol-2-ylazo)-naphthalene-2,7-disulfonic acid(104946-10-3)

Safety Data

• Hazardous Substances Data: 104946-10-3(Hazardous Substances Data)

Upstream product

• 4005-51-0 [1,3,4]Thiadiazol-2-ylamin 
• 135-51-3 3-hydroxy-2,7-naphthalenedisulfonic acid disodium salt 

Relevant articles and documents

Mechanism of azo coupling reactions. Part 34. Reactivity of five-membered ring heteroaromatic diazonium ions

The azo coupling reactions of six five-membered heteroaromatic diazonium ions with 2-naphthol-3,6-disulfonic acid are investigated kinetically at various pH values.The dependence of the measured rate constants on the acidity of the aqueous reaction system is evaluated.It can be shown that the 2-naphtholate-3,6-disulfonate trianion reacts 4E8 - 8E8 times faster than the 2-naphthol-3,6-disulfonate dianion.The rate constants of the six diazonium ions vary by more than four orders of magnitude.The logarithms of the rate constants of all comparable diazonium ions correlate linearly with 1H-nmr chemical shifts of the respective unsubstituted heteroaromatic parent compounds.An analogous correlation was found for azo couplings with substituted benzenediazonium ions.Diazotization of heteroaromatic amines does not go to completion, rather to an equilibrium.It is shown therefore that in acidic coupling systems the azo compound is only the kinetically controlled product.The thermodynamic products are 1-nitroso-2-naphthol-3,6-disulfonic acid and the heteroaromatic amine.