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UPSC Combined Geo-Scientist

Chemist

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

Mains Paper III covers analytical and organic chemistry.

UPSC Combined Geo-Scientist, Mains · 2019 · Mains Paper III

Q7(c). Gabriel route to proline

Question

Outline synthesis of proline using potassium phthalimide.

Answer in brief

Use a phthalimidomalonate synthesis to prepare 2-amino-5-bromopentanoic acid, then close its five-membered nitrogen ring.

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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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CoversGabriel route to prolineAmino-acid synthesis

All parts of Question 7