Heating the acyl azide in dry toluene under r | vedclass

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(A) The reaction is an intramolecular Curtius rearrangement.$1$. Upon heating,the acyl azide undergoes loss of $N_2$ to form an acyl nitrene or direct

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(A) The reaction is an intramolecular Curtius rearrangement.$1$. Upon heating,the acyl azide undergoes loss of $N_2$ to form an acyl nitrene or directly rearranges to an isocyanate intermediate.$2$. The ortho-amino group then performs a nucleophilic attack on the electrophilic carbon of the isocyanate group.$3$. This cyclization results in the formation of a cyclic urea derivative,specifically $1,3$-dihydro-$2H$-benzimidazol-$2$-one.

Heating the acyl azide in dry toluene under reflux for $3$ hours gives a $90\%$ yield for a heterocyclic product. Identify the product $(A)$.

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