Olefin Addition to the Transition Metal Salts

The simplest method for preparation of 7c-olefin coordination compounds is the reaction of addition of alkenes to inorganic salts in the solid state or in solution. Such reactions readily take place with group 11 metal compounds, e.g., Cu(I) and Ag(I)  

In the case of Cu(I) compounds, substituted olefins serve simultaneously as solvents. Silver compounds, AgX, react to give complexes containing two alkene molecules with the exception of ethylene. PtCl2 reacts with ethylene in the presence of HCl to afford Zeise s anion PtCl3(C2H4) . However, this reaction does not proceed to completion even at higher pressures of C2H4. 

The reaction of Pd(II) chloride with ethylene affords a dimer  

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