Organic Chemistry
8th Edition
ISBN: 9781305580350
Author: William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 20, Problem 20.54P
Interpretation Introduction
Interpretation: The mechanism for the given reaction has to be proposed:
Concept Introduction:
Pericyclic reaction:
The pericyclic reaction involves the redistribution of six electrons through the formation of a cyclic transition state from which a diene compound gets converted into its isomeric form.
Example with mechanism of a pericyclic reaction:
In this mechanism, two pi-bonds and one sigma bond of the reactant molecule has been broken and formed two new pi-bonds through a cyclic transition state.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solutionStudents have asked these similar questions
As we will learn in Chapter 9, an epoxide is an ether with an oxygen atom in a three-membered ring. Epoxides can be made by intramolecular SN2 reactions of intermediates that contain a nucleophile and a leaving group on adjacent carbons, as shown.Assume that each of the following starting materials can be converted to an epoxide by this reaction. Draw the product formed (including stereochemistry) from each starting material. Why might some of these reactions be more difficult than others in yielding nucleophilic substitution products?
Propose a mechanism for the reaction of benzyl acetate with methylamine. Label theattacking nucleophile and the leaving group, and draw the transition state in which theleaving group leaves.
Give two possible [1,2]-rearrangement products where an alkyl group migrates in the following compound. Motivate also which of the two products will be formed preferentially
Chapter 20 Solutions
Organic Chemistry
Ch. 20.1 - Prob. 20.1PCh. 20.1 - Estimate the stabilization gained as a result of...Ch. 20.2 - Predict the product(s) formed by addition of one...Ch. 20.3 - Prob. 20.4PCh. 20.3 - Prob. 20.5PCh. 20.4 - Prob. 20.6PCh. 20.5 - Prob. 20.7PCh. 20.5 - Prob. 20.8PCh. 20.5 - Prob. 20.9PCh. 20.6 - Prob. 20.10P
Ch. 20.6 - Prob. 20.11PCh. 20.6 - Prob. 20.12PCh. 20 - If an electron is added to 1,3-butadiene, into...Ch. 20 - Prob. 20.15PCh. 20 - Predict the structure of the major product formed...Ch. 20 - Predict the major product formed by 1,4-addition...Ch. 20 - Predict the structure of the major 1,2-addition...Ch. 20 - Prob. 20.19PCh. 20 - Prob. 20.20PCh. 20 - Prob. 20.21PCh. 20 - Prob. 20.22PCh. 20 - Prob. 20.23PCh. 20 - Pyridine exhibits a UV transition of the type n at...Ch. 20 - Prob. 20.25PCh. 20 - Prob. 20.26PCh. 20 - Prob. 20.27PCh. 20 - Write the frontier molecular orbital analysis for...Ch. 20 - Prob. 20.29PCh. 20 - Draw structural formulas for the products of...Ch. 20 - Propose structural formulas for compounds A and B...Ch. 20 - Under certain conditions, 1,3-butadiene can...Ch. 20 - Prob. 20.33PCh. 20 - Prob. 20.34PCh. 20 - The following triene undergoes an intramolecular...Ch. 20 - Prob. 20.36PCh. 20 - Prob. 20.37PCh. 20 - Prob. 20.38PCh. 20 - Prob. 20.39PCh. 20 - The Diels-Alder reaction is not limited to making...Ch. 20 - The first step in a synthesis of dodecahedrane...Ch. 20 - Bicyclo-2,5-heptadiene can be prepared in two...Ch. 20 - Prob. 20.43PCh. 20 - Prob. 20.44PCh. 20 - Following is a retrosynthetic scheme for the...Ch. 20 - Prob. 20.46PCh. 20 - Prob. 20.47PCh. 20 - Prob. 20.48PCh. 20 - Prob. 20.49PCh. 20 - Prob. 20.50PCh. 20 - What reaction presented in this chapter is...Ch. 20 - Claisen rearrangement of an allyl phenyl ether...Ch. 20 - Prob. 20.53PCh. 20 - Prob. 20.54PCh. 20 - We now continue the use of organic chemistry...Ch. 20 - Write the products of the following sequences of...
Knowledge Booster
Similar questions
- Nonconjugated , -unsaturated ketones, such as 3-cyclohexenone, are in an acid-catalyzed equilibrium with their conjugated , -unsaturated isomers. Propose a mechanism for this isomerization.arrow_forwardEthylene oxide is the starting material for the synthesis of 1,4-dioxane. Propose a mechanism for each step in this synthesis.arrow_forwardAll rearrangements we have discussed so far have involved generation of an electron-deficient carbon followed by a 1,2-shift of an atom or a group of atoms from an adjacent atom to the electron-deficient carbon. Rearrangements by a 1,2-shift can also occur following the generation of an electron-deficient oxygen. Propose a mechanism for the acid-catalyzed rearrangement of cumene hydroperoxide to phenol and acetone.arrow_forward
- The following transformation can be accomplished by reactions we have studied in this chapter and Chapter 20. Name the type of reaction used in each step.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_forwardThe reaction of an amine with an alkyl halide gives an ammonium salt. The rate of this SN2 reaction is sensitive to the polarity of the solvent. Draw an energy diagram for this reaction in a nonpolar solvent and another in a polar solvent. Consider the nature of the transition state, and explain why this reaction should be sensitive to the polarity of the solvent. Predict whether it will be faster or slower in a more polar solvent.arrow_forward
- Propose a mechanism for this reaction.arrow_forwardPayalarrow_forward2 H3C H3C H C→XT OH H3C The aldol reaction is a carbonyl condensation reaction between two carbonyl partners and involves a combination of nucleophilic addition and a-substitution steps. One partner is converted into an enolate ion nucleophile and adds to the electrophilic carbonyl group of the second partner. In the classic aldol reaction, the carbonyl partners are aldehydes or ketones, although aldehydes are more reactive. The product is a ß-hydroxy carbonyl compound. base :0: OH H H Under reaction conditions slightly more vigorous than those employed for the aldol reaction, the ß-hydroxyl group is eliminated in an E1cB dehydration to give an a,ß-unsaturated carbonyl compound. Draw curved arrows to show the movement of electrons in this step of the mechanism. Arrow-pushing Instruct ns H3C heat OH H3C :0: H + H₂O Harrow_forward
- Based on reactions we have learned in class, propose a multi-reaction sequence to accomplish the following synthesis. Show the reagents and conditions for each reaction and the product formed from each reaction, but do not show any mechanisms or reaction intermediates. OH OHarrow_forwardThe herbicide oxyfluorfen can be prepared by raction between a phenol and an aryl fluoride. Propose a mechanism. CH2CH3 кон NO2 Он `CH2CH3 NO2 Oxyfluorfenarrow_forwardDraw the structures of the initially formed enol tautomers in the reactions of propyne and dicyclohexylethyne with dicyclohexylborane followed by NaOHNaOH and H2O2H2O2arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage LearningOrganic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage Learning
Organic Chemistry
Chemistry
ISBN:9781305580350
Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. Foote
Publisher:Cengage Learning
Organic Chemistry: A Guided Inquiry
Chemistry
ISBN:9780618974122
Author:Andrei Straumanis
Publisher:Cengage Learning