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Question
Which of the following is a Gattermann reaction?
Options
\[\ce{ArN_2^+X- ->[CuCl/HCl] ArCl + N2 \uparrow}\]
\[\ce{ArN_2^+X- ->[K1][\Delta] ArI + N2 \uparrow + KX}\]
\[\ce{ArN^+_2X- ->[HBF4] ArN^+_2BF^-_4 -> ArF + N2 \uparrow BF3}\]
\[\ce{ArN^+_2 X^- ->[Cu/HBr] ArBr + N2 \uparrow}\]
MCQ
Solution
\[\ce{ArN^+_2 X^- ->[Cu/HBr] ArBr + N2 \uparrow}\]
Explanation:
Chlorine or bromine can be introduced into the arene ring in the Gattermann reaction by treating the arene diazonium salt solution with the appropriate halogen acid in the presence of copper powder.
\[\ce{AR - N^+_2X^- ->[Cu + HX][(X = Cl, Br)] Ar - X + N2}\]
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Reactions of Arene Diazonium Salts
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