
- APerkin reaction
- ✓Gattermann reaction
- CKolbe reaction
- DGattermann-Koch reaction

In this reaction, aromatic compound such as benzene or phenol is treated with a mixture of $HCN$ and dry $HCl$ gas under pressure and in the presence of anhydrous aluminum chloride or zinc chloride to introduce a formyl group in the aromatic nucleus.
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$\begin{array}{*{20}{c}}
{\,\,\,\,\,C{H_3}\,\,\,\,\,\,\,\,\,}\\
{|\,\,\,\,\,\,\,\,\,\,}\\
{C{H_3} - C - O - C{H_3}}\\
{|\,\,\,\,\,\,\,\,\,\,\,}\\
{\,\,\,\,\,\,\,{\kern 1pt} C{H_3}\,\,\,\,\,\,\,\,\,\,\,\,\,}
\end{array}\,\,$ $\xrightarrow[{(1\,Mole)}]{{HI}}$ Products
The main products of reaction will be
$(I)\,K_3 [Fe(CN_6)]$ $(II)\, [Ni(CO)_4]^0$ $(III)\, [Cr(NH_3)_6]^{3+}$ $(IV)\, [Mn(CN)_6]^{4-}$
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