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What is a coupling reaction?...

What is a coupling reaction?

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The reaction of diazonium salts with phenols in basic medium (pH 9-10) and with `1^(@)` amines in acidic medium (pH 4-5) to give the corresponding azo dyes is called the coupling reaction.
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Arenediazonium ion are weak electrophiles, they react with highly reactive aromatic compounds with phenols and tertiary aryl amines to yeild azo compounds. This electrophilic substitution is often called a diazo coupling reaction. What is the major product of given reaction?

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