solve please Page: 5 16. Which of the following compounds will react as a diene
ID: 879875 • Letter: S
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solve please Page: 5 16. Which of the following compounds will react as a diene in a Diels-Alder reaction? c. d. 17. For Diels-Alder cycloaddition reactions to take place 1 most rapidly and in highest yield the dienophile must: a. be aubstituted with electron-withdrawing groups b. be able to adopt and s-trans conformation c. be substituted with elect ron-donating groups d. be able to adopt an s-cis conformation 18. For a diene to undergo a Diels-Alder reaction it must: a. be substituted with electron-withdrawing groups b. be able to adopt and s-trans conformation c. be substituted with electron-donating groups d. be able to adopt an s-cis conformation Indicate which spectral technique, NMR, IR, UV or MS, would most readily allow differentiation between compounds in each pair of compounds below. Explain your answer in each case. 1 19. 2-Chloro-1,3-butadiene is polymerized to yield an 4 excellent, expensive synthetic rubber with good weather resistance called: a. chloroprene 2 b. isoprene c. styrene d. neopreneExplanation / Answer
16) a and c
17) a
18) d
19 b
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