Anti- and Non-aromatic

[JohnnnyD]

shouldnt this be anti-aromatic since it has 8 pi electrons? achiever says its non-aromatic

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[es1113]

this isn't a planar structure therefore non-aromatic. i think its just one of those random structures to keep in the back of your head

 

[Golfguy]

this isn't a planar structure therefore non-aromatic. i think its just one of those random structures to keep in the back of your head

Chad addresses this structure specifically. It believe it usually exists in a tub shape.

 

[wired202808]

shouldnt this be anti-aromatic since it has 8 pi electrons? achiever says its non-aromatic

exactly, just count the # of carbons, if its over 7 its not planar and therefore fails the planar rule and is non-aromatic.

 

[Golfguy]

There are several annulenes that are aromatic and consist of many carbons. You may want to take a look at those, they could throw one of those at you I suppose. Just memorize that one (your example), and use what wired said as the rule on the exam.

 

[Cool Beans]

exactly, just count the # of carbons, if its over 7 its not planar and therefore fails the planar rule and is non-aromatic.

If the ring has 7 atoms or fewer we can assume that it can adopt a planar conformation. However, if a ring has more than 7 atoms it may or may not be planar. Don't just assume that it's not. Cyclooctatetraene is definitely one to remember that isn't planar though.