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문제 23d
Draw the product of each of the following reactions:
d.
문제 23e
Draw the product of each of the following reactions:
e.
문제 23f
Draw the product of each of the following reactions:
f.
문제 23g
Draw the product of each of the following reactions:
g.
문제 23h
Draw the product of each of the following reactions:
h.
문제 24c,d
Draw the product of each of the following reactions:
c.
d.
문제 25
Account for the difference in the products of the following reactions:
문제 26
Show how norbornane can be prepared from cyclopentadiene.
문제 27
Show how the reactant can be converted to the product in two steps.
문제 28a(1,2)
a. Name the kind of sigmatropic rearrangement that occurs in each of the following reactions.
1.
2.
문제 28b
Draw the product formed when each of the following compounds undergoes an electrocyclic reaction
b. under photochemical conditions.
1.
2.
문제 29d
Draw the product of each of the following reactions:
d.
문제 29e
Draw the product of each of the following reactions:
e.
문제 32
What is the product of the following [1,3] sigmatropic rearrangement, A or B?
문제 33
If the compounds shown here are heated, one will form one product from a [1,3] sigmatropic rearrangement and the other will form two products from two different [1,3] sigmatropic rearrangements. Draw the products of the reactions.
문제 36
Propose a mechanism for the following reaction:
문제 37c
Draw the product of each of the following sigmatropic rearrangements:
c.
문제 37d
Draw the product of each of the following sigmatropic rearrangements:
d.
문제 38b
b. What would be the product if trans-2-butene were used instead of ethene?
문제 39
Explain why two different products are formed from disrotatory ring closure of (2E,4Z,6Z)-octatriene, but only one product is formed from disrotatory ring closure of (2E,4Z,6E)-octatriene.
문제 40
cis-3,4-Dimethylcyclobutene undergoes thermal ring opening to form the two products shown. One of the products is formed in 99% yield, the other in 1% yield. Which is which?
문제 41
If isomer A is heated to about 100 °C, a mixture of isomers A and B is formed. Explain why there is no trace of isomer C or D.
문제 42
Propose a mechanism for the following reaction:
문제 43
Explain why compound A will not undergo a ring-opening reaction under thermal conditions, but compound B will.
문제 44
A student found that heating any one of the isomers shown here resulted in scrambling of the deuterium to all three positions on the five-membered ring. Propose a mechanism to account for this observation.
문제 45
How can this transformation be carried out using only heat or light?
문제 46
Show the steps involved in the following reaction:
문제 47
Propose a mechanism for the reaction shown below:
![Chemical structure showing a [1,3] sigmatropic rearrangement with products labeled A and B.](https://static.studychannel.pearsonprd.tech/courses/organic-chemistry/thumbnails/7d32594d-bf7d-4007-b4a3-ad32290b6c43)
![Two chemical structures illustrating [1,3] sigmatropic rearrangements with labeled substituents and bonds.](https://static.studychannel.pearsonprd.tech/courses/organic-chemistry/thumbnails/680a2367-86d3-4ef3-8671-0b5b26018841)
![Chemical structure illustrating a [5,5] sigmatropic rearrangement with a phenyl group and a diene.](https://static.studychannel.pearsonprd.tech/courses/organic-chemistry/thumbnails/30886d49-6415-4309-97db-2ac92f18960f)
![Chemical structure illustrating a [5,5] sigmatropic rearrangement with a benzene ring and a carbon chain.](https://static.studychannel.pearsonprd.tech/courses/organic-chemistry/thumbnails/854fe803-2923-471a-8931-7b3cc94bcf04)
