Solomons 10th Ed. (2009)
CH 7: Alkenes and Alkynes I

Solutions can be seen at mendelset.com/chapters/1081


  1. Problem # 307

    Rank the group of molecules below in in order of decreasing basicity. (1 = most basic)

    Explain your reasoning.

  2. Problem # 319

    For a molecule to undergo an E2 reaction, the leaving group and the beta-proton must be in an anti-coplanar conformation (one atom straight up, the other straight down). Based on this, which compound undergoes E2 reaction with KOtBu faster? Why?

     

  3. Problem # 333

    Let's go over how a carbocation can form from an alcohol.

    Write in the curved arrows to show the formation of the protonated alcohol, and water acting as a leaving group to form a carbocation.

  4. Problem # 335

    Carbocations aren't very stable and so don't last very long after they are formed.

    Use curved arrows to show:

    a) how a carbocation reacts with a halide ions to form an alkyl halide.

    b) how a carbocation reacts with water to form an alcohol.

    c) how a carbocation reacts with a base to form an alkene.

  5. Problem # 341

     Predict the product(s) of the reaction below, and used curved arrows to show a mechanism.

  6. Problem # 348

    For the reaction below, draw the structures of the carbocation intermediate and the final product.

  7. Problem # 518

    The alcohol below is protonated and contains an oxygen with a positive charge. Using curved arrows, show the two "legal moves" that result in a neutral oxygen.

  8. Problem # 519

    Let's work through an elimination reaction. Draw the structures for each of the species in the three boxes below (protonated thiol, carbocation, and alkene). Also draw curved arrows to show electron movement. 

  9. Problem # 529

    Indicate the major organic product of the reaction below. Include stereochemistry.

  10. Problem # 530

     

    Let's work through anti and syn additions to alkenes.
    Show the product for each reaction below, and indicate whether the product will be a racemic mixture of enantiomers, or a meso compound (which is achiral).

  11. Problem # 531

     

    E2 elimination reactions require anti-coplanar geometry. (note: some textbooks call this anti-periplanar).
    Let's work through an E2 reaction, and rotate the molecule eblow into an anti-coplanar geometry to predict the product of this E2 reaction.

     

  12. Problem # 561

    Fill in the product for each reaction below. Indicate stereochemistry where appropriate.