W2013CHM2311 Part 5 Notes

A a destabilized compared to isolated ethylene for a

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Unformatted text preview: will always look like: SOMO A A SOMO S S A A A A S S 2n+1 electrons 4n+2 electrons 2n+1 electrons HMO Theory Predic0on of Aroma0city & An0aroma0city Important features when fragment orbital contains an odd number of carbons: 1.  Symmetry of fragment orbitals alternates. ↳  the lowest energy one being symmetric, the next one is an0symmetric, etc. 2.  # electrons in a fragment = # carbon atoms in the fragment, which is an odd number: 2n + 1 where n is a posi0ve integer. ↳  e.g., allyl contains 3 π electrons (2n + 1 where n = 1); pentadienyl contains 5 π electrons (2n + 1 where n = 2). 3.  The molecular orbitals will contain 2(2n + 1) = 4n+2 π electrons. ↳  e.g., benzene contains 6 π electrons (4n + 2 where n = 1). 4.  The (Singly Occupied MO)...
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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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