Indian Forest Service (Mains), Chemistry optional · 2024 · Paper II

Q3(a). Vilsmeier acylation of pyrrole

10 marks
Topic: Substitution reactions
Question only

Question

Complete pyrrole plus N,N-dimethylacetamide/POCl₃, followed by aqueous sodium carbonate, and give a detailed mechanism.

Model answer

The free solution for 2024 answers questions 1, 2, 4, 5 and 8, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Topic notes: aromatic substitution (electrophilic, nucleophilic) and heterocycles, with every Civil Services, IFoS and Geo-Scientist PYQ →

CoversVilsmeier-Haack reactionpyrrole acylation2-acetylpyrrolechloroiminium ionelectrophilic substitution of pyrrole

All parts of Question 3

3(a) Vilsmeier acylation of pyrrole10 marks
3(b) Five rearrangement products15 marks
3(c)(i) Endo selectivity in a Diels–Alder reaction10 marks
3(c)(ii) Electrocyclic closure of an E,Z diene5 marks