Major product formed in the following transformation is · ABC26OR0484
Subject: Organic Chemistry · Chapter: Reactive Intermediates · Topic: Intermediate – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
Major product formed in the following transformation is 
(a)
(b)
(c)
(d)
Answer
Answer: A ✓ checked by 4AB · confidence high
The source book printed no answer; this one was worked out and checked — see the explanation.
Explanation
Zn inserts into the allylic C–Br to give an allylzinc (Reformatsky/Barbier type) that adds to benzaldehyde; the alkoxide lactonises onto the ester, giving the α-methylene-γ-butyrolactone (a).
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