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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 · 2022 · Paper II

Q7(e). Lead tetraacetate cyclization of butanol

Question

Explain the conversion of n-butanol into tetrahydrofuran with Pb(OAc)₄ in benzene, on heating or irradiation.

Answer in brief

An alkoxy radical undergoes intramolecular 1,5-H transfer; oxidation and ring closure give tetrahydrofuran.

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Topic notes: reagents for oxidation, reduction and hydroboration, with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverslead tetraacetatealkoxy radical1,5-hydrogen transfertetrahydrofuran synthesisremote functionalization

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