Ch_322b_13.01

Ch_322b_13.01 - Chapter 13.1 lecture note

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Chapter 13 Conjugated Unsaturated Systems Introduction When trivalent carbon intermediates ( cations, radicals or anions ) are adjacent to alkenes , they are more stable than the isolated intermediates, and they display a different chemical reactivity. The term conjugated unsaturated systems describes these structures. C=C + C cation, radical or anion C=C-C conjugated unsaturated system cation, radical or anion
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An Extended ! -System The special properties of conjugated unsaturated systems arise from overlap of the p-orbital on the adjacent carbon with the ! -system of the alkene. C=C-C conjugated unsaturated system Conjugation means a ! -system extended by p-orbitals on adjacent carbons. C C C A ! -system of three overlapping p-orbitals is called allylic . an allylic cation, radical or anion
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Allylic Substitution and the Allylic Radical Propene reacts with Br 2 and Cl 2 by the usual electrophilic addition reaction at room temperature in the absence of ultraviolet radiation.
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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_13.01 - Chapter 13.1 lecture note

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