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Read on your own (sections 2.1 – 2.8): basic structure, nomenclature of alkanes, cycloalkanes, alkyl halides, ethers,

Read on your own (sections 2.1 – 2.8): basic structure, nomenclature of alkanes, cycloalkanes, alkyl halides, ethers, alcohols, amines. Boiling point: how strong are the forces holding molecules together? Alkanes: only VDW. size matters! Larger alkane, stronger VDW.

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Read on your own (sections 2.1 – 2.8): basic structure, nomenclature of alkanes, cycloalkanes, alkyl halides, ethers,

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  1. Read on your own (sections 2.1 – 2.8): basic structure, nomenclature of alkanes, cycloalkanes, alkyl halides, ethers, alcohols, amines

  2. Boiling point: how strong are the forces holding molecules together? Alkanes: only VDW

  3. size matters! Larger alkane, stronger VDW

  4. shape matters! More surface area, more VDW interactions

  5. stronger intermolecular forces:

  6. VDW only VDW plus dipole-dipole

  7. strongest: H-bonding bp = 100

  8. analyze the trend:

  9. analyze the trend:

  10. melting point: same concept as bp, but less regular shape more important: packing!

  11. melting points of fats and oils:

  12. Solubility

  13. What about: sol in NaHCO3(aq)?

  14. vitamins: water soluble or fat-soluble

  15. soaps and detergents

  16. Conformations – bond rotation

  17. A: eclipsed B, F: gauche D: staggered

  18. Cycloalkanes: small rings (3-4) have ring strain

  19. envelope conformation: increases ring strain, but reduces amount of eclipsed hydrogens

  20. Conformations of cyclohexane

  21. learn to draw chair conformations

  22. boat conformation:

  23. cis/trans different from axial/equitorial!

  24. two chair conformations equal energy, K = 1

  25. diequitorial much more stable: K<<1

  26. larger group equitorial: lower energy

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