W2013CHM2311 Part 5 Notes

Since interac0on of the systems ie delocaliza0on

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Unformatted text preview: 5 A A Ψ2 Ψ3 S S Ψ1 a lly l b en ze n e a lly l Labels with respect to a “central” mirror plane Orbitals can combine if they have similar energies and the same symmetry with respect to the central mirror plane Benzene π- MO Diagram: Combina0on of Two Allyl Fragments TOP VIEW OF ALLYL FRAGMENT TOP VIEW OF ALLYL FRAGMENT Energies: Ψ2 = Ψ3; Ψ4 = Ψ5 Ψ6 S e n er g y The π- system of a benzene ring is stabilized rela0ve to the π- system of isolated allyl fragments – i.e., electrons are in orbitals of lower energies. S Ψ4 Ψ5 A A Ψ2 Since interac0on of the π - systems (i.e., delocaliza0on of electrons) results in stabiliza0on, benzene is said to be aroma9c. Ψ3 S S Ψ1 a lly l Some Informa;on b en ze n e Labels are for “central” mirror plane a lly l Orbital Appearance: You should be able to derive the appearances of...
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