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

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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