Week 5 Objectives - 2 to a conjugated diene. Draw the...

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Page 1 of 1 Organic Chemistry II UC-Berkeley Extension, Spring 2011 March 2, 2011 Week 5: Conjugated Systems: Conjugated, unconjugated and cumulated dienes, stability of conjugated systems, effect of conjugation on kinetic vs. thermodynamic pathways, UV-Visible spectroscopy, electronic transitions between π bonding and π * anti-bonding molecular orbitals, Beer’s law, degree of conjugation. Objectives: Identify and describe the differences of unconjugated dienes, conjugated dienes, and cumulated dienes. Describe the relative stability of unconjugated and conjugated dienes. In general terms, describe the basis for the stability of conjugated systems. Identify the products for electrophilic addition of HBr or Br
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Unformatted text preview: 2 to a conjugated diene. Draw the mechanism of electrophilic addition of HBr or Br 2 to a conjugated diene, showing how the 1,4 product is formed under thermodynamic conditions and the 1,2 product is formed under kinetic conditions. Identify the kinetic and thermodynamic pathways on a reaction coordinate diagram. Identify the type of electronic transition resulting from absorption of radiation of a UV-Visible wavelength. Use Beers law to show the factors that determine the amount of absorption observed for a given sample. Identify the relationship between degree of conjugation and wavelength & energy of UV-Vis radiation that is absorbed....
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