Q30 · CSIR NET Chemistry, June 2021
Paper: CSIR NET June 2021 · Subject: Organic Chemistry · Chapter: Pericyclic Reactions · Topic: Pericyclic Reactions – General · Marks: 2 · Difficulty: Medium
The major product formed in the following reaction is 
Grubbs' catalyst ethylene
Grubbs' catalyst ethylene(a)
(b)
(c)
(d)
Answer
Answer: D ✓ checked by 4AB · confidence medium
Explanation
Ring-opening metathesis of the strained cyclobutene with ethylene, followed by ring-closing metathesis, rebuilds the eight-membered ring. The stereocentres are retained and the methyl-substituted alkene is in place (d) (source key d).
Study loop for Pericyclic Reactions