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Indian Forest Service (Mains)

Chemistry optional

  • 2 papers
  • 200 marks each
  • 3 h per paper

Paper II covers organic chemistry and spectroscopy.

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

Q4(c)(ii). Bischler–Napieralski cyclization

Question

Identify A and B from phenethylamine with RCOCl followed by POCl₃, and explain step II.

Answer in brief

A is PhCH₂CH₂NHCOR; B is a 1-R-substituted 3,4-dihydroisoquinoline.

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The full model answer

As written for the answer booklet: the diagram carries the working, the lines stay short. Read here only; it is not offered as a download.

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

CoversBischler-Napieralski reaction3,4-dihydroisoquinolinephenethylaminenitrilium ionPOCl3 cyclodehydration

All parts of Question 4