18. 2-Aminopyridine can be nitrated or sulfonated under much milder conditions than pyridine itself; substitution occurs chiefly at the 5-position. Account for these facts. 19. Ethyl bromosuccinate, I, is converted into the unsaturated ester ethyl fumarate, II, by the action of pyridine. What is the function of the pyridine? What advantage does it have over the usual alcoholic KOH conditions? ethyl fumarate ethyl bromosuccinate

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