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Concept explainers
Interpretation:
The mechanism for the given conversion has to be proposed.
Concept introduction: When two molecules of an ester undergo condensation is called claisen condensation. Like in aldol reaction, in claisen condensation one molecule is a nucleophile and the other molecule is an electrophile.
A claisen condensation reaction is a reversible reaction and occurs in the presence of a strong base.
The first step of claisen condensation is the removal of a proton from alpha carbon by a base and then the addition of enolate ion formed to the second ester molecule forming a β-ketoester.
A crossed-claisen condensation is also a condensation reaction between a
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Chapter 19 Solutions
Organic Chemistry
- 3) Propose a mechanism for the following reaction. HO H2SO4arrow_forwardThe reaction of an alkene with diazomethane forms a cyclopropane ring. Propose a mechanism for the reaction.arrow_forwardPropose a synthesis of molecule B from molecule A. For each step, indicate the necessary reagents.arrow_forward
- propose a mechanism for the following transformationarrow_forwardPropose a mechanism for the following reactions.arrow_forwardDraw reaction mechanisms with all reactants, arrows, intermediates, and products. Your mechanism must account for all the products if more than one product is formed. 4-methycyclohexanol with phosphoric acid H3PO4 to for 1-methycyclohexene, 3- methylcyclohexene and 4-methycyclohexenearrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning
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