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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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