Q32 · CSIR NET Chemistry, December 2019
Paper: CSIR NET December 2019 · Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Marks: 2 · Difficulty: Medium
The major product in the following reaction sequence is 
(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
The OMOM group directs t-BuLi lithiation to C-4 of 3-(methoxymethoxy)pyridine. 1,2-Diiodoethane acts as an I⁺ source (releasing ethylene), giving 4-iodo-3-(MOM-oxy)pyridine (b).
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