W2013CHM2311 Part 5 Notes

Hmo treatment of allylic species propylene a linear 3

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Unformatted text preview: orbital overlap. This prevents forma0on of the stabilized π- MO. Conclusion: Energy (and lots of it) must be added to the system to make this rota0on occur. Organic Molecules with π- Bonding Extending the Conjuga;on: Propylene Reac0vity (free radical) →  allylic hydrogens, those a]ached to a carbon adjacent to a double bond, are rela0vely easy to abstract. →  This is jus0fied in terms of the high stability of the allyl radical. Experiments have shown that the radical is symmetric. H H H C C H H C H H C H or H C H H or C H C C C C C C H H H H H H H H H propylene allyl radical H H C H C C H H allyl cation →  The allyl ca0on is more stable than expected also due to symmetry. In previous lectures, these observa0ons were a]ributed to resonance structures. HMO Treatment of Allylic S...
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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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