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ch13B_Recap_Quiz - Chapter13B Systems Createdby...

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Created by Professor William Tam & Dr. Phillis Chang Ch. 13 - Chapter 13B Chapter 13B Conjugated Unsaturated Conjugated Unsaturated Systems Systems
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Ch. 13 - 7B. B. Conformations of 1,3-Butadiene Conformations of 1,3-Butadiene (s-cis) (s-trans) H H (less stable) cis trans single bond single bond
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Ch. 13 - 7C. Molecular Orbitals of 1,3-Butadiene Molecular Orbitals of 1,3-Butadiene
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Ch. 13 - 1. The Stability of Conjugated  Dienes Conjugated double bonds are more  stable than isolated ones.  2 + 2 H 2 2 2 x (-127)=-254 H  o  (kJmol -1 ) =-239 Difference 15 + 2 H 2
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Ch. 13 - 1. Ultraviolet–Visible  Spectroscopy
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Ch. 13 - 9B. 9B. UV UV Vis Spectrophotometers Vis Spectrophotometers
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Ch. 13 -
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Ch. 13 - . . Absorption Maxima for Nonconjugated Absorption Maxima for Nonconjugated and Conjugated Dienes and Conjugated Dienes
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Ch. 13 - 1. Electrophilic Attack on Conjugated Dienes: 1,4 Addition Cl H Cl H 1 2 3 4 H Cl 25 o C + (78%) (1,2-Addition) (22%) (1,4-Addition)
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Ch. 13 - 1 (a) Cl H Mechanism Cl H + H (a) H (b) H X H δ + δ + Cl (b) Cl H (a) (b)
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Ch. 13 - 1 10A.
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