Concept explainers
PRACTICE PROBLEM 19.1
(a) Write a mechanism. for all steps of the Claisen condensation that take place when ethyl propanoate reacts with ethoxide ion.
(b) What products form when the reaction mixture is acidified?
Interpretation: The mechanism for all the steps of Claisen condensation when ethyl propanate reacts with ethoxide ion is to be written and when the reaction mixture acidified the product of the reaction is to be determined.
Concept introduction:
The Claisen condensation is the carbon-carbon bond forming reaction and important for the preparing
In Claisen condensation ester of one molecule adds to the carbonyl carbon of the another molecule and formation of
Answer to Problem 1PP
Solution:
(a)
(b)
Explanation of Solution
The mechanism for the reaction between ethylproponate and ethoxide ion is as follows:
Step 1
Step 2
Step 3
(b)
When the reaction mixture is acidified the reaction takes place is as follows;
Hence, the product formed when the reaction mixture acidified is as follows;
Want to see more full solutions like this?
Chapter 19 Solutions
Organic Chemistry
Additional Science Textbook Solutions
Principles of Chemistry: A Molecular Approach (3rd Edition)
Chemistry & Chemical Reactivity
General, Organic, and Biological Chemistry (3rd Edition)
Organic Chemistry (8th Edition)
Chemistry
Chemistry: The Molecular Nature of Matter
- Practice Problem 18.39 Rank the following compounds in order of increasing reactivity toward electrophilic aromatic substitution. Br A B Br Br E Increasing reactivity toward electrophilic aromatic substitutionarrow_forwardPhenylacetone can form two different enols.(a) Show the structures of these enolsarrow_forwardGive the structure of the product formed on reaction of ethyl acetoacetate with each of the following: (a) 1-Bromopentane and sodium ethoxide (b) Saponification (basic hydrolysis) and decarboxylation of the product in part (a) (c) Methyl iodide and the product in part (a) treated with sodium ethoxide (d) Saponification and decarboxylation of the product in part (c) (e) 1-Bromo-3-chloropropane and one equivalent of sodium ethoxide (f) Product in part (e) treated with a second equivalent of sodium ethoxide (g) Saponification and decarboxylation of the product in part (f) (h) Phenyl vinyl ketone and sodium ethoxide (i) Saponification and decarboxylation of the product in part (h)arrow_forward
- Provide the reagents and solvents (where appropriate) needed to bring about the following transformations. (a) CI (b)arrow_forward• PRACTICE PROBLEM 18.14 Show how you could employ enamines in syntheses of the following compounds: Een önös (c) (a) (b) (d) OEtarrow_forwardNucleophilic aromatic substitution provides one of the common methods for making phenols. ) Show how you would synthesize the following phenols, using benzene or toluene as your aromatic starting material, and explain why mixtures of products would be obtained in some cases. (a) m-cresol (b) p-n-butylphenolarrow_forward
- (b) A student wanted to synthesize methyl tert-butyl ether. He attempted the synthesis by adding sodium methoxide to tert-butyl chloride, but he obtained none of the desired product (1) (ii) Use an equation to show the product formed in this reaction Propose a suitable William ether synthetic route for methyl tert-butyl ether tach l.arrow_forwardSafrole, which is isolated from sassafras (Problem 21.33), can be converted to the illegal stimulant MDMA (3,4- methylenedioxymethamphetamine, “Ecstasy”) by a variety of methods. (a) Devise a synthesis that begins with safrole and uses a nucleophilic substitution reaction to introduce the amine. (b) Devise a synthesis that begins with safrole and uses reductive amination to introduce the amine.arrow_forwardSafrole, which is isolated from sassafras (Problem 21.33), can be converted to the illegal stimulant MDMA (3,4-methylenedioxymethamphetamine, "Ecstasy") by a variety of methods. (a) Devise a synthesis that begins with safrole and uses a nucleophilic substitution reaction to introduce the amine. (b) Devise a synthesis that begins with safrole and uses reductive amination to introduce the amine. NHCH9 MDMA safrolearrow_forward
- Draw a structural formula for the product formed by treating butanal with each reagent. (a) LiA1H4LiA1H4 followed by H2OH2O (b) NaBH4NaBH4 in CH3OH/H2O (c) H2/Pt (d) Ag(NH3)2+in NH3/H2O (e) H2CrO4, heat (f) HOCH2CH2OH,HClarrow_forward24.82 When the compound shown here is heated, ethene gas is evolved and a product with the formula C14H3O2 is formed. The 'H NMR and 13C NMR spectra of C14H8O2 are shown below. (There are two signals >150 ppm in the 13C NMR spectrum. Recall that the 13C NMR signal at 77 ppm is from the CDCI3 solvent.) (a) Draw the structure of C,14H3O2. (b) Draw the mechanism that accounts for its formation. (c) What is the main driving force that favors the products of this reaction? ? C14H3O2 C14H8O2 9. 8 7 6 4 3 2 1 250 200 150 100 50 Chemical shift (ppm) Chemical shift (ppm)arrow_forwardPredict the products of reactions of ethers and epoxides, including the following:(a) Cleavage and autoxidation of ethers(b) Acid- and base-promoted opening of epoxides(c) Reactions of epoxides with organometallic reagents(d) Cleavage of silyl ethersarrow_forward
- ChemistryChemistryISBN:9781305957404Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCostePublisher:Cengage LearningChemistryChemistryISBN:9781259911156Author:Raymond Chang Dr., Jason Overby ProfessorPublisher:McGraw-Hill EducationPrinciples of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
- Organic ChemistryChemistryISBN:9780078021558Author:Janice Gorzynski Smith Dr.Publisher:McGraw-Hill EducationChemistry: Principles and ReactionsChemistryISBN:9781305079373Author:William L. Masterton, Cecile N. HurleyPublisher:Cengage LearningElementary Principles of Chemical Processes, Bind...ChemistryISBN:9781118431221Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. BullardPublisher:WILEY