Chapter 14: Q 14-14-62 E (page 447)
Dimethyl butynedioate undergoes a Diels-Alder reaction with (2E,4E)-2,4-hexadiene. Show the structure and stereochemistry of the product.
Chapter 14: Q 14-14-62 E (page 447)
Dimethyl butynedioate undergoes a Diels-Alder reaction with (2E,4E)-2,4-hexadiene. Show the structure and stereochemistry of the product.
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their wavelength of maximum absorption in UV spectroscopy, from shortest to longest wavelength.
a)
b)
c)
Calculate the energy range of electromagnetic radiation in the UV region of the spectrum from 200 to 400 nm (see Section 12-5). How does this value compare with the values calculated previously for IR and NMR spectroscopy?
Addition of HCl to 1-methoxycyclohexene yields 1-chloro-1-methoxycyclohexane as a sole product. Use resonance structures to explain whynone of the other regioisomer is formed.
How could you use Diels-Alder reactions to prepare the following products ? Show the starting diene and dienophile in each case.
a)
Question: 1,3,5-Hexatriene has =258 nm. In light of your answer to Problem
14-48, approximately where would you expect 2,3-dimethyl-1,3,5-hexatriene to absorb?
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