Ch_322b_13.04 - Chapter 13.4 lecture note

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Summary of Rules for Resonance Resonance is a useful concept in organic chemistry since it gives insight into the reactivity and stability of organic structures. Rules for Writing Resonance Structures Resonance structures exist only on paper. They provide a picture of the location of valence-level electrons within a structure. When two or more electronic representations can be written, they are called resonance structures , and are connected by double-headed arrows ( ). The real molecule is a hybrid of all the resonance structures. (1) (2) In writing a series of resonance structures, only the electrons are moved. The positions of the nuclei remain the same . CH 3 -CH-CH=CH 2 CH 3 -CH=CH-CH 2 + + A B resonance structures A and B interconvert by moving an electron pair. CH 2 -CH 2 -CH=CH 2 + C not a resonance structure Structure C is formed by shifting an H.
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(3) Resonance structures must be proper Lewis structures . The valency rules must be followed. H-C-O-H
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This note was uploaded on 10/20/2009 for the course CHEM 322BL at USC.

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Ch_322b_13.04 - Chapter 13.4 lecture note

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