Frequently Asked Question

Questions asked by users might not always be phrased in the clearest way.

What are the reagents to synthesis Alizarin Yellow r?

Accepted Answer

Alizarin Yellow R, also known as 3-hydroxy-4-(phenylazo)-2-naphthoic acid, is synthesized through a diazo coupling reaction. The specific reagents used are:

3-Hydroxy-2-naphthoic acid: This is the starting material, acting as the coupling component.
Diazonium salt of aniline: This is the electrophilic species, formed from aniline and a suitable diazotizing agent like nitrous acid (HNO2).
The reaction involves the attack of the diazonium ion on the activated aromatic ring of 3-hydroxy-2-naphthoic acid. This process generates the azo bond characteristic of azo dyes, ultimately producing Alizarin Yellow R.


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