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    Hey guys. This molecules is a 5 membered ring with 2 double bonds between some of the carbons. I see that on wikipedia they draw it with a circle in the middle when in volved in a complex molecule. Does this mean it has de localised bonding?
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    (Original post by 'bob')
    Hey guys. This molecules is a 5 membered ring with 2 double bonds between some of the carbons. I see that on wikipedia they draw it with a circle in the middle when in volved in a complex molecule. Does this mean it has de localised bonding?
    yes, that's right. The cyclopentadienyl anion is aromatic. (this actually means that cyclopentadiene is more acidic than you'd normally expect a hydrocarbon to be - because of the increased stability of its conjugate base)
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    (Original post by 'bob')
    Hey guys. This molecules is a 5 membered ring with 2 double bonds between some of the carbons. I see that on wikipedia they draw it with a circle in the middle when in volved in a complex molecule. Does this mean it has de localised bonding?
    Yes, it is aromatic. The cyclopentadienyl ion has a negative charge. Each of the carbon atoms has one electron in the pi system, and the negative charge makes the 6th, hence obeying the 4n+2 rule.
 
 
 

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