(1) Show the step by step reaction mechanism for the SnAr2 reaction of 2,4-dinitrochlorobenzene and an amine.
(2) Explain why the nitro groups are important.
(3) The pKb of morpholine is 5.6. The pKb of piperidine is 2.9. Which would you expect to have the higher rate constant for Nucleophilic substitution? Why?