Problem 8.2 In the case study we have seen how an electrocyclization reaction of an enediyne in calicheamicin generates a reactive aryl diradical. Suggest a mechanism for the cyclization of a simple enediyne to a benzene diradical using fishhook arrows to keep track of the movement of electrons.
Problem 8.3 Shown below is a radical that exhibits remarkable stability. It is stable in its solid form, even in the presence of oxygen. Provide an explanation for why this particular radical is so unreactive.
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