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Conjugated Dienes and U.V. Spectroscopy

Conjugated Dienes and U.V. Spectroscopy. Some Dienes. Some Conjugated Molecules. Prevents DNA from Unraveling. Orbital Depiction of Ethylene. Orbital Depiction. D H hydrogenation. Carbocation is Resonance Stabilized. Carbocation Stability. Conjugate Addition of HBr.

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Conjugated Dienes and U.V. Spectroscopy

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  1. Conjugated Dienes and U.V. Spectroscopy

  2. Some Dienes

  3. Some Conjugated Molecules

  4. Prevents DNA from Unraveling

  5. Orbital Depiction of Ethylene

  6. Orbital Depiction

  7. DHhydrogenation

  8. Carbocation is Resonance Stabilized

  9. Carbocation Stability

  10. Conjugate Addition of HBr

  11. 1,2- vs. 1,4-Addition

  12. Kinetic and Thermodynamic Products

  13. Kinetic vs. Thermodynamic Control

  14. 2 Different 1,4- Products Form

  15. Thermodynamic Products

  16. Addition to 1,3,5-Hexatriene

  17. At 0oC 1,2-addition is favored

  18. At 40oC, 1,4-addition is preferred

  19. Form more stable carbocation

  20. Allylic Bromination With NBS

  21. Free Radical Mechanism

  22. Mechanism involves the gradual generation of Br2

  23. Resonance stabilization leads to possibly several products

  24. Diels-Alder Reactiona Pericyclic Reaction

  25. Dienophiles Must be Electron Deficient

  26. Stereochemistry

  27. Bicyclic Adductsendo and exo

  28. Endo Addition

  29. Identify the Diene and Dienophile that gives the Adducts

  30. Two Phosphatase Inhibitors

  31. A Radiosensitizer

  32. Synthesis of LS-5

  33. 1,3-Butadiene and EthyleneMolecular Orbitals

  34. Proper Orbital Overlap

  35. Overlap Must be Constructive

  36. Unsymmetrical Diels-Alder Reactions

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