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Diels-Alder CN Reaction CN diene dienophile D. 1. 03, -78°C "H H' 2. Zn/H2O 4. Circle...
4. Draw the diene and dienophile that undergo a Diels Alder reaction to form the compounds below show stereochemistry where appropriate. 5 pts CH3 OCH In the compound above the diene and dienophile are part of the same molecule OCH3 CN
Choose the diene and dienophile pair that will give the fastest and slowest Diels-Alder reaction. (+ draw each products) CO diene CH2 CN CH2 dienophile CN CH2
19. [04 pts.] What diene and dienophile would react to give the following Diels-Alder product? dienophile diene 20. [06 pts.] Label each compound as aromatic, antiarobave planar rings. at atic or not aromatic. Assume that those compounds that are completely conjugated a. в-н 21. [04 pts.] Give the systematic name for each of the following compounds. 22. [04 pts.] Draw all possible resonance structures for the following molecule.
Draw structural formulas for the diene and dienophile that combine in a Diels-Alder reaction to form the product shown. CN H3C Diene + Dienophile → нас • Consider EZ stereochemistry of alkenes. • Draw one structure per sketcher. Add additional sketchers using the drop-down menu in the bottom right corner. • Separate multiple products using the - sign from the drop-down menu.
Questions 1. Why does the trans conformation of a diene, in reaction with a dienophile, not lead to a Diels-Alder reaction product? 2. Complete the following Diels-Alder reactions. Provide the major endo-product(s). Dienophile Product(s) 3. How many i electrons are there in a molecule of 1,3-butadiene?
1. Draw in the structure of a diene and a dienophile that would do the Diels-Alder reaction. The diene should contain one (E)-alkene and the dienophile should contain one ester. Major Product heat 2. Draw the major product in the box. Indicate stereochemistry with dashes and wedges. If the compound is racemic, write "+/-", and if it is meso, indicate this. 3. Are there any other regioisomers that could form in this reaction? Explain. 4. Are there any other stereoisomers...
Provide the product structure of the Diels-Alder reaction show below. Identidy the respective substrates with either diene or dienophile labels circle the correct answer 1) Provide the product structure of the Diels-Alder reaction show below. Identify the respective substrates with either diene or dienophile labels-circle the correct answer below the substrate. (2 pts) 25 °C OCH3 OH Diene Diene or or Dienophile Dienophile c yclohex-3- eneccbaylc a 2) True or False: Butadiene is an (1 pt) easily handled liquid that...
(2) Diels-Alder reactions of a diene with a dienophile are known to undergo a concerted reaction. However, 2,3-Di- tert-1,3-butadene does not undergo Diels-Aider reactions. Explain 2,3-di-tert-1,3-butadiene (4) Propose mechanisms for the following steps 1 and 2. Slep 1 Step 2 Bry Br NaBH CH acetic acid (I) Using> as a symbol, rank the following alkyl bromides in order of decreasing reactivity. (6 pts) Br Cн,Br -Br (a) For hydrolysis by an Sy1 mechanism (b) For hydrolysis by an S,2 mechanism...
I. Conjugated dienes undergo Diels-Alder reaction and form 6-membered rings. In order for this reaction to occur, the diene must be in the S-cis conformation and an alkene (dienophile) preferably with an electron-withdrawing group. EW EW U +U Diene S-cis conformation Dienophile racemic product Indicate which of the following compounds can function as the diene in Diels- Alder reaction and why: Cli) The rates of Diels-Alder reaction of the compounds below are compare with that of 1,3butadiene. Please explain the...
1) Provide the product structure of the Diels-Alder reaction show below. Identify the respective substrates with either diene or dienophile labels-circle the correct answer below the substrate. (2 pts) Diene Diene or Dienophile or Dienophile