Provide the structure (a single resonance contributor) of the key intermediate in the following reaction
. 
Definitions:
Tungsten
A hard, rare metal under standard conditions, with the highest melting point of all the elements, used in light bulb filaments and steel alloys.
Elemental Symbol
A one or two-letter abbreviation used to represent an element on the periodic table.
Chlorine
A chemical element with symbol Cl and atomic number 17, known for its powerful disinfectant properties and used in water purification.
Symbol Cu
The chemical symbol for Copper, a reddish-brown metal with high thermal and electrical conductivity.
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