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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 · 2023 · Paper II

Q5(b). Osmium dihydroxylation of an allylic alcohol

Question

Give the product of the drawn cyclohex-2-en-1-ol with OsO₄/pyridine followed by water. [structure of the cyclohexenol given in the paper]

Answer in brief

A cyclohexane-1,2,3-triol forms. The two new OH groups are cis to each other; ordinary steric approach favours their placement opposite the pre-existing OH.

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CoversOsO₄ dihydroxylationsyn additionosmate esterallylic alcoholcyclohexane-1,2,3-triol

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