Anti Vs. Non

[jdent]

Can someone please explain the difference between anti and non aromatic? Orgodox, klutzy, someone?

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[Daydream46]

Can someone please explain the difference between anti and non aromatic? Orgodox, klutzy, someone?

anti meets all aromatic rules besides Huckles rule.... Non breaks another rule (ie. its not planar or conjugated or something)

 

[klutzy1987]

anti meets all aromatic rules besides Huckles rule.... Non breaks another rule (ie. its not planar or conjugated or something)

Huckles number of 4 or 8 is anti. Any other reason for nonaromaticity is non.

 

[nixon13]

Anti-aromatic follows the 4n rule. So if you have a cyclic conjugated ring, it will either by anti aromatic or aromatic depending on the number of pi electrons. So if you had benzene thats 6 pi electrons so you use huckels rule 4n+2 = 6 solve for n and u get 1 which is a whole number so benzene is aromatic. If you have a cyclic conjugated ring with lets say 8 pi electrons then try to set it equal to 4n+2. So 4n+2 = 8 where n equals 6/4 which is not a whole number. So its not aromatic. So try the anti-aromatic equation 4n. 4n=8 where n equals 2. 2 is a whole number so a conjugated cyclic ring with 8 pi electrons will be anti-aromatic. Non aromaticity refers to something that doesnt have conjugated double bonds or isnt a ring. so hexene or cyclohexene are non-aromatics.

 

[IcemanDDS]

^^ good answer

 

[bigasianpianist]

don't forget that its got to be planar too. if it isn't it loses its aromaticity because the pi electrons aren't conjugated on the same plane, and would lose its resonance

 

[nixon13]

tru dat.

 

[Contach]

don't forget that its got to be planar too. if it isn't it loses its aromaticity because the pi electrons aren't conjugated on the same plane, and would lose its resonance

how do you know when a cyclic molecule is no longer planar? I was under the impression if a cyclic molecule is conjugated it will ALWAYS be planar....

 

[jdent]

how do you know when a cyclic molecule is no longer planar? I was under the impression if a cyclic molecule is conjugated it will ALWAYS be planar....

no not all cyclics are planart picture a cyclooctane with conjugation it is not planar rather more like a bathtub shape.