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Active methylene compounds are of great ...

Active methylene compounds are of great importance in synthetic chemistry. When `–CH_(2)` (methylene) group is flanked between two electron withdrawing groups, then its hydrogen becomes acidic and can be replaced easily. The acidity of methylene hydrogen depends upon the strength of electron withdrawing group. Acetoacetic ester, malonic ester, etc. are the examples of active methylene compound. In synthetic application acidic hydrogen is trapped by a strong base to get resonance stabilised anion which reacts accordingly to give the desired product.

Which one of the following is most effective as an active methylene compound ?

A

B

`CH_(3)COCH_(2)COOEt`

C

D

Text Solution

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The correct Answer is:
A
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Active methylene compounds are of great importance in synthetic chemistry. When –CH_(2) (methylene) group is flanked between two electron withdrawing groups, then its hydrogen becomes acidic and can be replaced easily. The acidity of methylene hydrogen depends upon the strength of electron withdrawing group. Acetoacetic ester, malonic ester, etc. are the examples of active methylene compound. In synthetic application acidic hydrogen is trapped by a strong base to get resonance stabilised anion which reacts accordingly to give the desired product. The final product is :

Active methylene compounds are of great importance in synthetic chemistry. When –CH_(2) (methylene) group is flanked between two electron withdrawing groups, then its hydrogen becomes acidic and can be replaced easily. The acidity of methylene hydrogen depends upon the strength of electron withdrawing group. Acetoacetic ester, malonic ester, etc. are the examples of active methylene compound. In synthetic application acidic hydrogen is trapped by a strong base to get resonance stabilised anion which reacts accordingly to give the desired product. CH_(3)COCH_(2)COOEt underset({:((ii)CH_(3)CH_(2)Br),(" not in excess"):})overset((i)NaOEt)toA underset((ii)"Heat")overset((i)"dil".HCl)to Product, Products are :

Which of the following compounds contain active methylene group ?

Which have active methylene group?

The electron -withdrawing group from the following is _______.

In which of the following compounds the methylenic hydrogens the most acidic ?