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Is saccharin aromatic?
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xshadow:
I don't undertand if bot the ring of saccharin are aromatic
Obviously the benzene ring is aromatic.
Than I have a substitued ""thiazole" ring
All atoms of the 5-membered ring can be sp2 with a p orbital perpendicular to the molecule plane
But what about the Huckel rule
Benzene has 3 electron pair
The ""thiazole"" ring in saccharin how many pi-electron pairs does it have?
N has a lone pair
Sulfur don't think has a lone pair avaiable because it has laready 6 bonds. All its pi-electrons (the two S=O double bonds) are outside of the ring. I think they don't count.
SO I should have :
3 pi-electron pair from benzene ring (3 C=C)
1 pi-electron pair from thiazole ring ( lone pair on N)
But with 4 pairs...isn't aromatic
Thanks
chenbeier:
No you have to calculate every ring seprately.
Benzen is aromatic. So the molecule is aromatoc.
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