Q28 · CSIR NET Chemistry, December 2013
Paper: CSIR NET December 2013 · Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Marks: 2 · Difficulty: Medium
The major product formed in the following reaction sequence is: 
(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
SOCl₂ then Et₃N generate diphenylketene; [2+2] with ethyl vinyl ether bonds the ketene carbonyl carbon to the nucleophilic CH₂ and CPh₂ to CH(OEt), giving 3-ethoxy-2,2-diphenylcyclobutanone (b).
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