[Nescafe]

Hi,

I was thinking about the Copper Based Click chemistry and the role of copper as a catalyst and began to think of the mechanism. So so commonly Cu(I) is employed, for example CuI (electron count 10). In the first step of the mechanism it is believed to coordinate to the alkyne, how does the metal coordinate, I am not very good with orbitals and all the HOMO LUMO good stuff. Also, when it coordinates they just show it as a line from CuLn to the alkyne. At this point how many electrons does the Cu have? is it 10electrons or 11. In 18 electron rule alkyne donates two electrons right? and no charge...

Confusion.

Nescafe.