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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

Q2(a)(i). A para-Claisen crossover experiment

Question

Predict the products on heating the two ortho-blocked allyl aryl ethers together. What mechanistic information follows? [structures of the two ethers given in the paper]

Answer in brief

Each ether gives its own para-rearranged phenol. The two allyl chains are not exchanged between the aromatic rings.

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Topic notes: methods of studying mechanisms (isotopic labelling, crossover, trapping, kinetic isotope effect, kinetic and thermodynamic control), with every Civil Services, IFoS and Geo-Scientist PYQ →

Coverspara-Claisen rearrangementcrossover experiment[3,3] sigmatropic shiftallyl aryl etherintramolecular mechanism

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