Sn1 and E1

[Gholam2020]

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Hello Everyone,
Quick question the Sn1 and E1 reaction on ring how can expansion take place! For example from 5 member ring to 6 member ring!
Thanks,


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[bentley13]

Hello Everyone,
Quick question the Sn1 and E1 reaction on ring how can expansion take place! For example from 5 member ring to 6 member ring!
Thanks,


Sent from my iPhone using SDN mobile

So it's going to be similar to a hydride shift, you are just shifting an alkyl group instead. A C-C bond will break and a new C-C bond will form with the carbocation. The positive charge will then shift to the carbon involved in the break that isn't part of the new C-C bond. It will only occur when there is a lot of ring strain; so it'd be more common to see this in a reaction converting cyclobutane to cyclopentane. It can occur from 5C to 6C but a 5C ring is already pretty stable.

 

[Gholam2020]

Thanx


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