- Write in the product of this Diels-Alder reaction. Be sure to include stereochemistry where relevant. དྲི་ད་༢༠ Write in the diene and the dienophile which would react together in a Diels-Alder reaction to give this product:
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- Imagine that you used isoprene as diene – in that case you don’t have to worry about assigning endo vs exo. Draw the "endo" and "exo" products of the Diels-Alder reaction between isoprene and maleic anhydride, and explain why the distinction is irrelevant here.Step 6: Now that you have determined the substrates and mechanism of a Diels-Alder reaction, you will learn how to recognize when you should use the Diels-Alder reaction. In a synthesis reaction, if you are given a cyclohexene product with no other obvious functional group transformations and an electron-withdrawing group two carbons away from the alkene, it is likely made via the Diels-Alder reaction. Deduce the structures of the starting materials to form the Diels-Alder adduct shown. ..... CN CN Diene + DienophileWhich of the following statments is TRUE about the Diels-Alder cycloaddition reaction? The best reactions occur with an electron-rich diene and an electron-poor dienophile. The reaction favors the exo-product. Entropy drives the reaction toward the cyclohexene product. The reaction is not stereospecific with respect to the dienophile stereochemistry.
- [Review Topics] [References] Draw structural formulas for the diene and dienophile that combine in a Diels-Alder reaction to form the product shown. Diene + Dienophile CH3O CH₂ I wwwwwww7. Although the Diels-Alder reaction generally occurs between an electron-rich diene and an electron- deficient dienophile, it is also possible to have inverse-demand Diels-Alder reactions between suitable electron-deficient conjugated double bonds and electron-rich alkenes. These reactions are particularly useful because they allow for the incorporation of heteroatoms into the new six-membered ring. Predict the products of each inverse-demand Diels-Alder reaction below. Be sure your products reflect the correct stereochemistry. If more than one regio-isomer is possible, draw both. la) CI CI Cl CH2 CI (b) H2C (c) H2C CO2CH3 H2C OCH3 - nth of maximumThis is a Diels-Alder reaction between ethylene and cis-1,3-butadiene. For each cycloaddition product, draw in all hydrogen atoms, and write the molecular formula below.
- 4. Show using resonance which of the molecules below is considered an electron-donating group (EDG) and which the electron-withdrawing group (EWG): Он он vs. (a) Which dienophile above will cause a Diels-Alder reaction to proceed more rapidly with a higher yield? Briefly explain why this is the case.3. What diene and dienophile should be used to synthesize the following compounds in a Diels- Alder reaction. CN CH3. CO,CH3 C=N ICO,CH3 H- H CN CH, ČEN ОНС -СНО 4. Indicate which of the following molecules and ions would show aromatic character. For those that are aromatic indicate the number of pi electrons in the system and for those that are not give a reason why. H H +) CH3The Diels–Alder Reaction – A [4+2] Cycloaddition Experiment. (a) Explain why the endo-rule is not obeyed when furan is used as the diene. Use chemical structures and models to support your answer.
- The diene lactone shown in part (a) has one electron-donating group (¬OR) and one electron-withdrawing group(C“O). This diene lactone is sufficiently electron-rich to serve as the diene in a Diels–Alder reaction.(a) What product would you expect to form when this diene reacts with methyl acetylenecarboxylate, a strong dienophile?The following triene undergoes an intramolecular Diels-Alder reaction to give a bicyclic product. Propose a structural formula for the product. Account for the observation that the Diels-Alder reaction given in this problem takes place under milder conditions (at lower temperature) than the analogous Diels-Alder reaction 0"C Diels-Alder adductExp3: Diels-Alder reaction Why does cyclopentadiene regularly form a dimer? How to break the dimer into monomers? Does the diene in this reaction act as the nucleophile or the electrophile? Is the maleic anhydride a nucleophile or an electrophile in this reaction? Explain your reasoning.
