# What is CuCl.CO.2H2O?

What is the chemical $\ce{CuCl.CO.2H2O}$, formed via the reaction of copper chloride and carbon monoxide?

Does this compound have any use or appear in any noteworthy reaction?

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The compound is called copper(I) chloride dihydrate - carbon monoxide adduct. It is formed during the Gatterman-Koch reaction.

Gatterman-Koch reaction is a reaction that produces aromatic aldehyde from aromatic hydrocarbons. The reagent used are carbon monoxide, hydrochloric acid and a Friedel-Craft catalyst like copper(I) chloride($\ce{CuCl}$) or aluminium chloride($\ce{AlCl3}$). So, the adduct is formed by the reaction of copper chloride and carbon monoxide during the course of reaction. If aluminium chloride is used, then a complex would be formed i.e aluminum trichloride complex($\ce{[HCO(AlCl4)}$).

To know more about the mechanism and role of reagents, see here.

Reference

$\ce{CuCl.CO.2H2O}$ is the addidtion compound when CO is passed through the ammonical solution of cuprous chloride.

$$\ce{CuCl + CO + 2H2O -> CuCl.CO.2H2O}$$

We can consider it as coordination compound in which Chlorido and carbonyl acts as ligands and it can be represented as $\ce{[CuCl(CO)].2H2O}$