W2013CHM2311 Part 5 Notes

E electrons are in orbitals of lower energies s 4 5 a

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Unformatted text preview: s (e.g., ethylene, butadiene, etc.), each carbon atom contributes one electron to the π- system. ↳  the number of electrons is equal to the number of carbon atoms. 2.  In ca0onic π- systems (e.g., allyl ca0on), the molecule’s π- system will contain a number of electrons equal to the number of carbon atoms minus the charge. 3.  In anionic π- systems (e.g., allyl anion), the molecule’s π- system will contain a number of electrons equal to the number of carbon atoms plus the charge. HMO Theory Applica0on to Aroma0city & An0aroma0city The π MOs of cyclic conjugated hydrocarbons can be determined by combining the π MOs of chain fragments. If the occupied orbitals of the ring are lower in energy than the occupied orbitals of the chain fragments, the ring is aroma9c. If the occupied orbitals...
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This note was uploaded on 03/28/2014 for the course CHM 2311 taught by Professor Richardson during the Winter '09 term at University of Ottawa.

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