In the third step of the synthesis there are two different nucleophilic heteroatoms available for reaction with the acetic anhydride. First, draw the product that would have formed if the other heteroatom had reacted with the acetic anhydride. Secondly, indicate what data was used to choose which of these heteroatoms reacted. Finally, chemically explain why one of the heteroatoms reacts in preference to the other one.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.