# What is CuCl · CO · 2 H₂O?

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 this previous question on chem.SE..

Other References

By dissolving mixture of ammoniacal cuprous chloride solution with carbon monoxide, the reaction that occurs is the formation for copper(I) chloride dihydrate carbon monoxide adduct:

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

This reaction is also used in Bosch process for the removal of carbon monoxide.

• It would be nice if the answer were also backed up by providing the references to the original publication/patent. – andselisk May 31 at 6:34

$\ce{CuCl.CO.2H2O}$ 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 $\ce{[CuCl(CO)].2H2O}$