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?

  • 2
    $\begingroup$ Welcome to Chemistry! This is a homework question. We have a policy which states that ‎you should show your thoughts and/or efforts into solving the problem. It'll make us certain that ‎we aren't doing your homework for you. Otherwise, this question may get closed.‎ Please edit in your full reasoning or thoughts on this. $\endgroup$ – M.A.R. Jan 28 '17 at 13:37

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.


  1. https://en.wikipedia.org/wiki/Gattermann_reaction
  2. Gattermann-Koch reaction - Role of CuCl
  3. https://books.google.co.in/books?id=4x-GAwAAQBAJ&pg=PA642&lpg=PA642&dq=copper+chloride+adduct+carbon+monoxide&source=bl&ots=COrB4nClDK&sig=lGpwIWk-mUxQE1kDeqYP3q1ymqQ&hl=en&sa=X&ved=0ahUKEwj5vt_kr-bRAhVHLo8KHYkfBhUQ6AEIJDAD#v=onepage&q=copper%20chloride%20adduct%20carbon%20monoxide&f=false
  4. https://www3.aiche.org/proceedings/Abstract.aspx?PaperID=358705

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

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

It is white crystalline adduct.

I dont really know the name... but this is the story behind this compound..

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    $\begingroup$ You're not saying much that OP didn't already say, to be honest. It's not much of your fault; the question is just poor. $\endgroup$ – orthocresol Jan 28 '17 at 14:13

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

  • $\begingroup$ Cu+ is transition metal ion and it form coordination compounds with Lewis bases. $\endgroup$ – narendra kumar Jan 28 '17 at 14:31

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