W2013CHM2311 Part 5 Notes

The six electrons associated with the system are thus

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Unformatted text preview: gated chains. ↳  use nodal, symmetry and bonding pa]erns. These pa]erns can also be applied to π- conjugated ring systems (e.g., cyclobutadiene, benzene). ↳  aroma0city (or an0aroma0city) can be predicted based on π- MO ↳  Hückel rule for aroma0city and an0aroma0city The “ring cheat” system provides a simple approach to π- MO diagrams for π- conjugated rings. π- MO Diagrams for Planar Polyatomic Molecules Extending MO theory to more complex systems complicates ma]ers. However, it is possible to deal with π- conjugated systems of more complex molecules in a fairly simple way. The molecules for which this is possible are those that are planar, and o[en posses resonance structures. ↳  e.g., CO32- , NO3- , etc. A general AB3 system (e.g., NO3- ): 1.  Determine the number of electrons to be incorporated into the π- system. ↳  draw out all the valid resonance structures for the system even if some of them would be ruled out based on formal charge. ↳  total number of valence electrons...
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