UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper III

Q9(c). Electrocyclic product by Woodward–Hoffmann rules

5 marks
Topic: Electrocyclic reactions
Question only

Question

Identify the product of the following transformation. Use the Woodward–Hoffmann rule to explain the outcome of the reaction. [reaction given in the paper]

Model answer

The free solution for 2018 answers questions 1, 4, 5, 6, 7 and 10, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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CoversWoodward-Hoffmann ruleselectrocyclic reactionconrotatory disrotatorythermal

All parts of Question 9

9(a) Chlorotriphenylmethane with silver: the trityl radical5 marks
9(b) Product and stereochemistry of an acid-catalysed silyl reaction5 marks
9(c) Electrocyclic product by Woodward–Hoffmann rules5 marks
9(d) Synthetic sequence for a given transformation5 marks
9(e) Aromaticity and methyl shifts of a dimethyldihydropyrene system10 marks