Aromatic Compounds

[limukbohil]

i'm not sure if i really know how to figure out an aromatic compound

 

For example, Pyridine

I'm confused about the lone pair electrons on the nitrogen.

Its not on the pi orbital because its on delocalized, right?

That explains why pyridine has 6 pi electrons, all carbons are sp2 and the nitrogen is sp2 as well. Right? lol

 

Another example that im not sure: Oxepin

It has 8pi electrons because only one lone pair electrons on the oxygen is delocalized and not the other?

 

Thank you for the help ^^

[hell_ever]

Oxepin is an antiaromatic compound. Antiaromaticity

 

It has a planar ring, which shows resonance, similar to an aromatic compound. But the only thing that makes it different from an aromatic compound is that it fails Huckel's Rule, as it has 8 pi electrons as you correctly mentioned. Only one of the 2 lone pairs of the oxygen are delocalized within the ring.

[ChemSiddiqui]

i'm not sure if i really know how to figure out an aromatic compound

 

For example, Pyridine

I'm confused about the lone pair electrons on the nitrogen.

Its not on the pi orbital because its on delocalized, right?

That explains why pyridine has 6 pi electrons, all carbons are sp2 and the nitrogen is sp2 as well. Right? lol

 

Another example that im not sure: Oxepin

It has 8pi electrons because only one lone pair electrons on the oxygen is delocalized and not the other?

 

Thank you for the help ^^

 

 

Apply "4n+2" or Huckel's rule for planar ringed organic compound. if the number of pi electrons and lone pair agrees with the huckels rule then the compound is aromatic.