W2013CHM2311 Part 5 Notes

Iden0fy the homo and lumo for each molecule short cuts

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Unformatted text preview: they must have similar energies and symmetries. Orbitals combine in- phase and out- of- phase. H C A A C C C H H H Energy H H S S HMO Treatment of π- Systems Butadiene: a linear 4- carbon π- system Energy A S A S HMO Treatment of π- Systems Butadiene: a linear 4- carbon π- system Experimental observa0on: rota0on around the C2- C3 bond of butadiene requires very li]le energy. Using the MO diagram of butadiene, you should be able to explain why. H H 1 C H C 2 H 3 C H C 4 H π- MOs of Linear π- Systems H H H H H H H H H H H H H H H Energy H H H H H H H HMO Theory for π- Systems Look for generali;es: MO diagrams for π- systems can be derived from MO theory concepts (as shown for ethylene and butadiene). However, there are “short- cuts” one can use to derive the MOs. First, try to...
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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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