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Sir please explain what is active methylene? How does it take part in reactivity of compound?

Sir please explain what is active methylene?


How does it take part in reactivity of compound?

Grade:12

1 Answers

Badiuddin askIITians.ismu Expert
147 Points
11 years ago

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)

acidity of an active methylene system

 

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