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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: Gameofketones on February 25, 2021, 01:18:24 AM

Title: Annulenes
Post by: Gameofketones on February 25, 2021, 01:18:24 AM

Are odd numbered carbons possible in annulenes? Annulenes must be conjugated so are odd rings possible?

Title: Re: Annulenes
Post by: clarkstill on February 25, 2021, 03:21:29 AM

By the IUPAC definition they are, but odd numbered ones have the formula CnH(n+1), which isn’t fully conjugated. More intuitively I’d call the cyclopentadienyl anion and the tropylium cation annulenes, but looking at the definition I’m not sure that they are!