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The base catalysed addition of a compoun...

The base catalysed addition of a compound having active methylene group (or relatively acidic hydrogen) to activate alkene is known as Michael addition reaction.


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Which have active methylene group?

Which of the following compounds contain active methylene group ?

Which carbonyl group of the given compound is most reactive for nucleophilic addition reaction ?

The method of estimation of active hydrogen in a compound by reaction with CH_(3)Mgl is known as:

Benzoin condensation Reaction|| Benzil-Benzilic acid Rearrangement||Reformatsky Reaction||Reaction OF active methylene group|| Knoevenagel Reaction|| Michael addition Reaction

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

The base catalysed reaction of 1,2-diketone to a salt of 2-hydroxy carbonxylic acid is known as benzile acid rearrangement . The reaction is not application to 1,2-diketones containing alpha- methylene group because of competing aldol condensation .