E1CB Reaction in Organic Chemistry | A Logical Approach | Jee Mains | Advanced | NEET | AIIMS

Hello guys, Today we are going to discuss one of the most important topic for jee and medical entrance examination and it is E1CB (Elimination unimolecular Conjugate Base). Although E1 reactions typically involves a carbocation intermediate, the E1cB reactoin utilizes a carbanion intermediate. This reaction is generally utilized when a poor leaving group, such an and alcohol, is involved. This poor leaving group makes the direct E1 or E2 reactions difficult. This reaction is used later in a reaction called an aldol condensation.
The product of this β -elimination reaction is an α,β-unsaturated aldehyde or ketone. Base-catalyzed elimination occurs with heating. The additional stability provided by the conjugated carbonyl system of the product makes some aldol reactions thermodynamically and mixtures of stereoisomers (E & Z) are obtained from some reactions.
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The reaction is pseudo 1st order

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Means E1cB

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