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Topic: GIlman reagent oxidation number  (Read 3666 times)

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Offline Shadow

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GIlman reagent oxidation number
« on: September 15, 2014, 04:03:39 PM »
What is the oxidation number of copper in the Gilman reagent?
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Offline spirochete

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Re: GIlman reagent oxidation number
« Reply #1 on: September 15, 2014, 04:09:02 PM »
What does the lewis structure look like? Where are the formal charges? What are the relative electronegativities of carbon, copper and lithium?
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Offline zsinger

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Re: GIlman reagent oxidation number
« Reply #2 on: September 15, 2014, 06:06:12 PM »
What spiro said.  With that info, you will have your answer! :)
          -Z
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"The answer is of zero significance if one cannot distinctly arrive at said place with an explanation"

Offline Shadow

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Re: GIlman reagent oxidation number
« Reply #3 on: September 16, 2014, 08:12:46 AM »
Is it +1? The R2Cu- moiety has a copper whose electronegativity is less than carbon, so it gets +2 from the two alkyl groups and -1 from the real charge, right?
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Offline Shadow

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Re: GIlman reagent oxidation number
« Reply #4 on: September 17, 2014, 02:45:28 PM »
Can anyone prove this?
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Offline argulor

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Re: GIlman reagent oxidation number
« Reply #5 on: September 19, 2014, 02:22:33 AM »
Each alkyl ligand contributes a charge of (-1) and as you said the total charge on the species must be equal to -1; so we must be dealing with copper in the +1 oxidation state. Looks like you're good!
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