Anti and NON and Aromatic...?

[illbirz]

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are'nt Anti-aromatic, aromatic and NONe aromatic all different? Or is non aromatic the same as anti-aromatic? Topscore and Achiever are making me go cookoo.

 

[klutzy1987]

If something has a huckles number of 4 or 8 it is anti aromatic. If something has anything else or isnt conjugated or doesnt have resonance it is non aromatic. Non aromatic just means something isnt aromatic while anti aromatic means it has a huckles number of 4 or 8.

 

[Orgodox]

Exactly right also keep in mind that 4n pi electrons doesnt automatically make something antiaromatic it has to also be cyclic conjugated and flat. And also note that nonaromatic is fine like klutzy said its just not aromatic, but antiaromatic is destabilizing

 

[scuzfly]

how do you know if something is flat? No six or five member ring is flat so are the only flat conjugated cyclic compunds square and triangular?

 

[bigstix808]

how do you know if something is flat? No six or five member ring is flat so are the only flat conjugated cyclic compunds square and triangular?

benzene has 6 carbons and is planar...point me 🙂


if a molecule is cyclic and conjugated, it HAS to be planar...look up details on VESPR theory for full explination

 

[Orgodox]

how do you know if something is flat?

For our purposes we assume if something passes the other 3 tests (cyclic conjugated and 4n+2 pi electrons) that it is planar and is then aromatic

No six or five member ring is flat so are the only flat conjugated cyclic compunds square and triangular?

Have you heard of benzene? many 5 and 6 membered rings can be planar. I assume you are confusing the fact that we talk of the boat and chair form for 6 memebred ring but thats cyclohexane (no double bonds) but benzene certainly is aromatic!

 

[scuzfly]

Orgodox hit it right on the head. I wasn't thinking about the double bonds in benzene. Guess that would flatten it out.

It makes sense. I just had a momontary absence of thinking. double bonds are 120 and 180 degrees so it has to be flat. Thinkining of a 5 membered ring or a 7 membered ring it wouldn't fit aromatic if it didn't have the correct number of pi electrons and if it has the correct number it's not going to be able to be anything BUT planar.