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Question 6 2 pts Which of the following cannot be a diene in the Diels-Alder reaction?...
Which compound below cannot act as a diene in a Diels Alder reaction? HN CN II...
Which compound below cannot act as a diene in a Diels Alder
reaction?
HN CN II III IV V
Questions 1. Why does the trans conformation of a diene, in reaction with a dienophile, not lead to a Diels-Alder r...
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?
Question 11 Which diene reacts the slowest with cyclopentadiene in a Diels-Alder reaction? O IV
Question 11 Which diene reacts the slowest with cyclopentadiene in a Diels-Alder reaction? O IV
Question 29 (2 points) Which one of the following dienophiles is least reactive in the Diels-Alder...
Question 29 (2 points) Which one of the following dienophiles is least reactive in the Diels-Alder reaction? NO OCH H3CO TI IV O a) IV Oы) і OI d) III Question 30 (2 points) Which of the following are possible products of the reaction shown? hv NBS Br Br III IV a) I, II, III and IV Ob) I, III and IV O I, II and III O d) I and II
(2) Diels-Alder reactions of a diene with a dienophile are known to undergo a concerted reaction....
(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...
When butadiene reacts with ethyne in a Diels-Alder reaction, what product is formed? O A. cyclohexa-1,4-diene...
When butadiene reacts with ethyne in a Diels-Alder reaction, what product is formed? O A. cyclohexa-1,4-diene OB. cyclohexyne OC. cyclohexene OD. cyclohexa-1,3-diene E. cyclohexane Reset Selection Question 4 of 10 1 Points How many nodes are in the highest energy MO for the allylic anion? OA. 1 OB.O OC. 2 OD. 3 Reset Selection
Question Completion Stat What diene and dienophile are needed to prepare the following Diels-Alder product? Ін...
Question Completion Stat What diene and dienophile are needed to prepare the following Diels-Alder product? Ін COOCH, OH OH + Hycooc COOCH, Il H.CO + н,соос IV III 11 III IV ther question will save this response.
Testbank, Question 041 Which one of the following represents the lowest energy n-bonding molecular orbital of...
Testbank, Question 041 Which one of the following represents the lowest energy n-bonding molecular orbital of 1,3-butadiene? III IV OI оп 0 0 Testbank, Question 096 Which diene and dienophile would react to give the following Diels-Alder product? + в О: ОТ o o o o o
Sort the dienophiles shown below by increasing reactivity in a Diels-Alder reaction with cyclohexa-1,3-diene. No -...
Sort the dienophiles shown below by increasing reactivity in a Diels-Alder reaction with cyclohexa-1,3-diene. No - CN Bro. с в Cyclohexa-1,3-diene 01.0,A,C,B O 2.B,A,C,D O 3.C,B,D,A 4. B, A, D, C
Question 7 (2 points) Which of the following dienes can undergo the Diels-Alder reaction? II III...
Question 7 (2 points) Which of the following dienes can undergo the Diels-Alder reaction? II III IV a) 11 Ob) III Oc) Od IV Question 8 (2 points) How would you use 'H NMR spectroscopy to distinguish between the following compounds based on the benzene ring protons? II O O a) Benzene protons for I show up between 6.0 - 7.0 ppm and Il between 7.0 - 8.0 ppm Ob) Benzene protons for I show up between 7.0 - 8.0...
Which compound below cannot act as a diene in a Diels Alder
reaction?
HN CN II III IV V
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?
Question 11 Which diene reacts the slowest with cyclopentadiene in a Diels-Alder reaction? O IV
Question 29 (2 points) Which one of the following dienophiles is least reactive in the Diels-Alder reaction? NO OCH H3CO TI IV O a) IV Oы) і OI d) III Question 30 (2 points) Which of the following are possible products of the reaction shown? hv NBS Br Br III IV a) I, II, III and IV Ob) I, III and IV O I, II and III O d) I and II
(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...
When butadiene reacts with ethyne in a Diels-Alder reaction, what product is formed? O A. cyclohexa-1,4-diene OB. cyclohexyne OC. cyclohexene OD. cyclohexa-1,3-diene E. cyclohexane Reset Selection Question 4 of 10 1 Points How many nodes are in the highest energy MO for the allylic anion? OA. 1 OB.O OC. 2 OD. 3 Reset Selection
Question Completion Stat What diene and dienophile are needed to prepare the following Diels-Alder product? Ін COOCH, OH OH + Hycooc COOCH, Il H.CO + н,соос IV III 11 III IV ther question will save this response.
Testbank, Question 041 Which one of the following represents the lowest energy n-bonding molecular orbital of 1,3-butadiene? III IV OI оп 0 0 Testbank, Question 096 Which diene and dienophile would react to give the following Diels-Alder product? + в О: ОТ o o o o o
Sort the dienophiles shown below by increasing reactivity in a Diels-Alder reaction with cyclohexa-1,3-diene. No - CN Bro. с в Cyclohexa-1,3-diene 01.0,A,C,B O 2.B,A,C,D O 3.C,B,D,A 4. B, A, D, C
Question 7 (2 points) Which of the following dienes can undergo the Diels-Alder reaction? II III IV a) 11 Ob) III Oc) Od IV Question 8 (2 points) How would you use 'H NMR spectroscopy to distinguish between the following compounds based on the benzene ring protons? II O O a) Benzene protons for I show up between 6.0 - 7.0 ppm and Il between 7.0 - 8.0 ppm Ob) Benzene protons for I show up between 7.0 - 8.0...
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