ch13abbreviated

ch13abbreviated - Chapter 13 Conjugated Unsaturated Systems...

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Created by 1 Chapter 13 Conjugated Unsaturated Systems
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2 1. Introduction A conjugated system involves at least one atom with a p orbital adjacent to at least one π bond e.g.
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3 3. The Stability of the Allyl Radical 3A. Molecular Orbital Description of the Allyl Radical
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4
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5 7C. Molecular Orbitals of 1,3-Butadiene
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6 6. Alkadienes and Polyunsaturated Hydrocarbons Alkadienes (“Dienes”)
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7 Alkatrienes (“Trienes”)
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8 Alkadiynes (“Diynes”) Alkenynes (“Enynes”)
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9 Cumulenes enantiomers
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10 Conjugated dienes Isolated double bonds
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11 9. Ultraviolet–Visible Spectroscopy The absorption of UV–Vis radiation is caused by transfer of energy from the radiation beam to electrons that can be excited to higher energy orbitals
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12 9A. The Electromagnetic Spectrum
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13 9B. UV Vis Spectrophotometers
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14
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15 hv Excited state* Δ E C C H H H H ! ! * ! ! * Electronic transitions
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16 9C. Absorption Maxima for Nonconjugated and Conjugated Dienes
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17 Increase in conjugation length shifts absorption to longer wavelengths R R R R R R Importance of conjugation length
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This note was uploaded on 02/20/2012 for the course CHEM 334 taught by Professor Wang during the Spring '09 term at South Carolina.

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ch13abbreviated - Chapter 13 Conjugated Unsaturated Systems...

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