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Topic: Partial neg charge on C  (Read 4123 times)

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ygao85

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Partial neg charge on C
« on: June 21, 2005, 11:53:22 PM »
Why does an alkyl lithium (RLi) have a partial negative carbon?
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Offline DrCMS

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Re:Partial neg charge on C
« Reply #1 on: June 22, 2005, 04:15:38 AM »
It's due to the very electropositive metal next to it.
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Offline lemonoman

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Re:Partial neg charge on C
« Reply #2 on: June 22, 2005, 07:56:12 PM »
Yup.  Lithium is SO desperate for electrons, enough so that the orbitting electrons prefer to be on that side of the bond.  Traditionally, carbon (esp. sp3 hybridized) shares its electrons rather equally with its neighbours.  But not in this case.

If you're familiar with Grignard Reagents:


Magnesium here is the opposite.
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