Q57 · CSIR-NET Chemistry, June 2012
Paper: CSIR-NET June 2012 · Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Marks: 2 · Difficulty: Medium
The major product formed in the following concerted reaction is 
(a)
(b)
(c)
(d)
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
cis,cis,cis-Cyclonona-1,3,5-triene undergoes thermal 6π disrotatory closure to cis-fused bicyclo[4.3.0]nona-2,4-diene, with both ring-fusion H on the same face (a).
Study loop for Pericyclic Reactions