 4. Reactions The aim of
this chapter is to present several prototypes of common
reactions, including a short treatment of concerted
electrocyclic reactions, cycloadditions and sigmatropic
rearrangements. We now have a rather unsatisfactory
situation in which elementary mechanistic organic
chemistry is treated using valence-bond and resonance
arguments (because they work and are easy to explain) but
that for the above processes a more thorough
understanding can be obtained using MO-theory. Next: |
