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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 · 2018 · Mains Paper III

Q7(e). Bucherer amination

Question

Propose a mechanism for 1-naphthol + benzylamine/NaHSO₃ giving 1-(benzylamino)naphthalene.

Answer in brief

The Bucherer reaction replaces naphtholic OH by NHCH₂Ph through reversible bisulfite-assisted dearomatisation and imine formation.

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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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Read the whole 2018 solution2018 question paper

CoversBucherer aminationNaphthol chemistry

All parts of Question 7