Aromaticity

[BenignDMD]

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Whats the difference btw non-aromatic, and antiaromatic?

to be an aromatic it has to be planar and follow huckel's 4n+2 rule, but what is an antiaromatic? I know its different than a non-aromatic, but I cant find a good clarification btw the two...

 

[dat_student]

Whats the difference btw non-aromatic, and antiaromatic?

to be an aromatic it has to be planar and follow huckel's 4n+2 rule, but what is an antiaromatic? I know its different than a non-aromatic, but I cant find a good clarification btw the two...

anti-aromatic is 4n

 

[MANSIMRAN]

planar???
please explain

Whats the difference btw non-aromatic, and antiaromatic?

to be an aromatic it has to be planar and follow huckel's 4n+2 rule, but what is an antiaromatic? I know its different than a non-aromatic, but I cant find a good clarification btw the two...

 

[BenignDMD]

anti-aromatic is 4n

sweet...thanks, I had thought it was 4n, but wasnt completley sure

 

[BenignDMD]

planar???
please explain

planar is all in one plane, like benzene

 

[dat_student]

planar is all in one plane, like benzene

It has to be planar but a lot of times the "planar" factor is ignored. How many true "4n+2-planar-molecules" do you know? 😉

 

[BenignDMD]

It has to be planar but a lot of times the "planar" factor is ignored. How many true "4n+2-planar-molecules" do you know? 😉

true

 

[heshyn2000]

sweet...thanks, I had thought it was 4n, but wasnt completley sure

Its 4n and 8n aswell, for example a hot tub shape.

 

[E. coli]

Anti-aromatic has 4n pi electrons and is unstable relative to non-aromatic.

 

[star777]

what about anti-aromatic vs. non-aromatic?

 

[fannian]

i thought i understood this, but now i'm confused (i think topscore 1st O chem test explains it)

could someone break down: aromatic vs anti-aromatic vs non-aromatic in a clear concise way?

thanks

 

[BenignDMD]

what about anti-aromatic vs. non-aromatic?

non-aromatic, i believe, are not planar, and they do not have 4n+2 or 4n or 8n pi electrons

correct me if im wrong anyone....if someone knows all the criteria that would be helpful

thanks

 

[dat_student]

Its 4n and 8n aswell, for example a hot tub shape.

tell me an 8n that is not a 4n 😉 Hint: 8n / 4n = 2

 

[BenignDMD]

i thought i understood this, but now i'm confused (i think topscore 1st O chem test explains it)

could someone break down: aromatic vs anti-aromatic vs non-aromatic in a clear concise way?

thanks

Aromatic: 4n+2 pi elec., Conjugated, Planar

Non Aromatic: Are not Planar, though they may be conjugated and have 4n+2 pi electrons

Antiaromatic: Has 4n pi electrons, may also be conjugated and cyclic, also planar

Easiest way is to just count the double bonds as 2 pi electrons...benzene is cyclic, planar and has 6 pi elec. (4(2) + 2).....If you have an 8 sided cyclic conjugated ring, it will have 8 pi electrons (2*4 dbl bonds) which is does not fit 4n+2, but it does fit 4n...however it is not planar....dont forget to count lone pair electrons too....Im sure that there will be one of these questions on the DAT...I see it everywhere!

 

[BenignDMD]

tell me an 8n that is not a 4n 😉 Hint: 8n / 4n = 2

I guess its for those that cant figure out that 8 = 4*2, or 4=4*1

or even 32 = 8*4 😀