When Do Lone Pairs Contribute to Aromaticity?
The Specific Rule Is That If You Have an Sp2 Conjugated System, the Lone Pair Will Be Involved If It Makes the System More Stable. in This Case, Conferring...
The specific rule is that if you have an sp2 conjugated system, the lone pair will be involved if it makes the system more stable. In this case, conferring Hückel 4n+2 aromaticity. For furan with two lone pairs on the oxygen atom, if we count electrons from the carbon atoms, we have 4 (one per carbon).
Do lone pairs count in aromaticity?
This means that the lone pair is not involved in aromaticity. So the shortcut rule is: for the purposes of aromaticity, if an atom is involved in a pi bond, ignore the lone pair.
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Do lone pairs contribute to conjugation?
Conjugation is possible by means of alternating single and double bonds in which each atom supplies a p orbital perpendicular to the plane of the molecule. ... The other lone pair remains in plane and does not participate in conjugation.
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