1. Provide a plausible explanation for the following difference
in selectivity.
4. Please explain why the following reaction does not work in
the presence of a base but does in the presence of an acid.
2. Please provide an explanation for the success of the
following cyclization reactions.
5. What is the second orbital interaction responsible for the
formation of an epoxide in the reaction of a peracid and an
alkene? Why did we only consider one intereaction?
6. Propose the mechanism shared by the following two
reactions, consistent with the fact that one works and the
other one does not. (TMS = Me3Si)
3. Provide a mechanism for the following transformation.