Concept explainers
Interpretation:
The structures of the two Diels-Alder adducts formed when isoprene (2-methyl-1, 3-butadiene) reacts with ethyl propenoate are to be given and why a mixture of products is formed is to be explained.
Concept introduction:
In Diels-Alder reaction, a dienophile reacts with a diene to yield a cyclic adduct. The reaction takes place through 1, 4 addition of the dienophile into the diene through a cyclic transition state. These reactions occur rapidly with dienophiles having electron withdrawing substituent groups in conjugation with the double bond and if the diene adapts a s-cis conformation during the reaction.
To give:
The structures of the two Diels-Alder adducts formed when isoprene (2-methyl-1, 3-butadiene) reacts with ethyl propenoate and to explain why a mixture of products is formed.
Trending nowThis is a popular solution!
Chapter 14 Solutions
Organic Chemistry
- As an example of a ver rare occurence, the following hydrocarbon reacts with two equivalents of butylithium to form a dianion of the formula [C8H6]2- . Propose a structure for this dianion and explain why this dianion forms so readily.arrow_forwardHydrocarbon A, C10H14, has a UV absorption maximum at 236 nm and gives hydrocarbon B, C10H18, on catalytic hydrogenation. A reacts with maleic anhydride to yield a Diels-Alder adduct. Ozonolysis of A followed by zinc/acetic acid treatment yields the following diketo dialdehyde: Propose a structure for hydrocarbon Aarrow_forwardBicyclo-2,5-heptadiene can be prepared in two steps from cyclopentadiene and vinyl chloride. Provide a mechanism for each step.arrow_forward
- What is the major monosubstitution product from the Friedel—Crafts reaction of benzene with 1 -chloro-2-methylpropane in the presence of AlCl3?arrow_forward1. write out all the isomers of the compound with molecular formula C4H10O. 2. select the normal/primary isomer and treat it with conc.H2SO4 and heat to produce A. Identify the type of reaction 3. Treatment of A with HCl/H2O gives B and with cold KMnO4/ OH- gives C . Give the name and structures of A, B and C 4. Treatment of A with Hot KMnO4/OH- gives D followed by acidification of the mixture to give E. What is D and E ?arrow_forwarda-Tetralone undergoes Birch reduction to give an excellent yield of a single product. Predict the structure of the product, and propose a mechanism for its formation.arrow_forward
- reaction of either 3-bromo-1-butene or (Z) -1-bromo-2-butene with water under SN1 condition yields the same product explain whyarrow_forwardwhy do (R)-3-chloro-1-methylcycloprop-1-ene and 5-Bromo-1,3-Cyclohexadiene react differently with cyanide (why doesn't cyanide pass through its usual mechanism for these two products and what did you obtain these specific products)arrow_forwardWhat is the structure of cis-jasmone, a natural product isolated from jasmine flowers, formed by treatment of alkyne A with H2 in the presence of the Lindlar catalyst?arrow_forward
- Aromatic substitution can be done on naphthalene. Treatment of naphthalene with concentrated H2SO4 gives two (and only two) different sulfonic acids.arrow_forwardDiphenylacetylene can be synthesized by the double dehydrohalogenation of 1,2-dibromo-1,2-diphenylethene. The sequence starting from (E)-1,2-diphenylethene consists of bromination to give the dibromide, followed by dehydrohalogenation to give a vinylic bromide, then a second dehydrohalogenation to give diphenylacetylene.(a) What is the structure, including stereochemistry, of the vinylic bromide?(b) If the sequence starts with (Z)-1,2-dibromo-1,2-diphenylethene, what is (are) the structure(s) of the intermediate dibromide(s)? What is the structure of the vinylic bromide?arrow_forwardDehydrohalogenation of 1-chloro-1-methylcyclopropane affords two alkenes (A and B) as products. Explain why A is the major product despite the fact that it contains the less substituted double bond.arrow_forward
- Organic ChemistryChemistryISBN:9781305580350Author:William H. Brown, Brent L. Iverson, Eric Anslyn, Christopher S. FootePublisher:Cengage Learning