Aromaticity- Carbanions?

[paymaant]

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Are carbanions considered sp2 or sp3??

 

[Moka11]

Are carbanions considered sp2 or sp3??

3 bond pairs + 1 lone pair = 4 -------sp3

 

[paymaant]

3 bond pairs + 1 lone pair = 4 -------sp3

Thanks!

 

[Moka11]

Thanks!

Np. But my answer wasnt entirely accurate....it can be less. For example in a Grignard it'll be sp.

Remember for Carbanion its the reverse of a Carbocation so 1>2>3. Which would make a Carbanion thats sp3 the least stable.

 

[paymaant]

The reason I ask this question is because I found out cyclopentadiene with a carbanion at the top carbon is aromatic?? I understand that there are 6 pi electrons but if the top carbon is sp3, I thought that disobeys the rules of aromaticity...

 

[paymaant]

Never mind, I figured it out!