Q. The thermal cyclisation of trans, trans – 2,4-hexadiene gives _.

A
Only trans -3,4-dimethyl-cyclo butene
B
Only cis-3,4-dimethyl -cyclobutene
C
Both the above products in equal amount.
D
Cyclo-hexane
Solution:
  • Cyclization is the simplest way to introduce a conformational constraint often via connecting two suitable sites (head to tail, backbone to side chain, or side chain to side chain).
  • Thermal electrocyclic ring closure of trans, trans-2, 4-hexadiene forms a cyclobutene with trans
    methyl group.
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