The major product formed in the following reaction sequence is (i) LDA, -78°C · ABC26OR0658
Subject: Organic Chemistry · Chapter: Reagents, Reaction Mechanisms & Named Reactions · Topic: Reagents, Reaction Mechanisms & Named Reactions – General · Exam: GATE 2000-2022 · Marks: 2 · Difficulty: Medium
The major product formed in the following reaction sequence is (i) LDA, $-78^{\circ}$C
(a)
(b)
(c)
(d)
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
LDA at −78 °C forms the kinetic (less substituted) enolate; PhSeCl selenates C-6 and H₂O₂ syn-eliminates toward C-5, giving 6-methylcyclohex-2-enone (b).
Study loop for Reagents, Reaction Mechanisms & Named Reactions