Q52 · CSIR-NET Chemistry, June 2016
Paper: CSIR-NET June 2016 · Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Electrocyclic · Marks: 2 · Difficulty: Medium
The following transformation proceeds through two consecutive electrocyclic processes, which are 
(a)$4 \pi$ conrotatory and $6 \pi$ conrotatory
(b)$4 \pi$ disrotatory and $6 \pi$ conrotatory
(c)$4 \pi$ conrotatory and $6 \pi$ disrotatory
(d)$4 \pi$ disrotatory and $6 \pi$ disrotatory
Answer
Answer: C ✓ checked by 4AB · confidence high
Explanation
A cyclobutene opens thermally by a 4π conrotatory process, and the resulting triene closes by a 6π disrotatory electrocyclisation.
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