W2013CHM2311 Part 5 Notes

3 from the resonance structures nd the minimum number

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Unformatted text preview: ons resul0ng in net destabiliza9on for the ring structure. Conclusion: A conjugated ring containing 4n π electrons will be destabilized as a result of electron delocaliza0on. Thus, it is called an;aroma;c. HMO Theory Predic0on of Aroma0city & An0aroma0city Based on our MO theory analysis of π- systems, we can conclude that any cyclic, conjugated hydrocarbon with 4n + 2 π electrons will be aroma0c (stable) and with 4n π electrons will be an0aroma0c (unstable). This is called “Hückel’s Rule” 4n + 2 π electrons: aroma0c 4n π electrons: an0aroma0c HMO Treatment of Cyclic π- Systems The smallest cyclic π- system is cyclo- C3H3. This is the “cyclized” version of allyl. The MO could be constructed by looking at the π 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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