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Sir please explain what is active methylene?
How does it take part in reactivity of compound?
Dear Anurag
In some molecules there are H atoms that are adjacent to 2 carbonyl groups (which are electron withdrawing). Extra resonance stabilisation of the enolate anion makes these H more acidic (i.e lower pKa) than hydrogens adjacent to a single carbonyl group. These type of compounds are sometimes called "active methylenes" (recall a methylene group is a CH2)
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