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What does phenol form by reaction with the HCN and HCl?

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What does phenol form by reaction with the HCN and HCl?

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When phenol reacts with the mixture of HCN and HCl in the presence of ZnCl2 catalyst aldimine formed as intermediate. On hydrolysis, aldimine forms p-hydroxybenzaldehyde. This reaction is known as Gattermann reaction.

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