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Explain the following ructions : (a) Gabriel Phthalimide reaction (b) Coupling reaction |
Answer» Solution :Gabriel.1 phthalimide synthesis : Phthalimide when treated with alcoholic potassiumhydroxide is easily converted into potassium phthalimide which on TREATMENT with alkyl halide followed by hydrolysis with acid or alkali yields phthalic add and a primary amine.  (b) Coupling reaction : It involves the reaction of bezene DIAZONIUM salts with phendols or ARYL amines. Coupling of phenol TAKES place in MILD alkaline solution while with aromatic `1^(@)` amines in mild acidic medium. 
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