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Chapter 6: Q32P (page 262)

What aspect of the structure of the alkene does ozonolysis not tell you ?

Short Answer

Expert verified

It doesn't say if the double bond is in the E or Z configuration.

Step by step solution

01

Definition of ozonolysis - 

When an alkene is treated with ozone (O3) at a low temperature, the double bond's s and p bonds break, and the carbons that were previously doubly bound to each other are now doubly bonded to oxygens. Because the number of CO bonds rises, this is an oxidation reaction known as ozonolysis.

02

Reductive ozonolysis is the process of converting an alkene into two carbonyl molecules.

We can have cis/trans or E/Z stereochemistry if the R groups are different.

1 is a Z alkene if R2 and R4 are the higher priority groups.

2 is an alkene of the type E.

Both, however, produce the same ozonolysis products.

Reductive ozonolysis cannot discriminate between cis-but-2-ene and trans-but-2-ene.

03

Conclusion-

The only ozonolysis product in both cases is acetaldehyde.

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Most popular questions from this chapter

When Br2adds to a cis alkene that has different substituents attached to each of the two sp2carbons, such as cis-2-heptene, identical amounts of the two threo enantiomers are obtained even though Br-is more likely to attack the less sterically hindered carbon of the bromonium ion. Explain why identical amounts of the two enantiomers are obtained.

eDraw structures for the following:

a. 2-propyloxirane

b. cyclohexene oxide

c. 2,2,3,3-tetramethyloxirane

d. 2,3-epoxy-2-methylpentane

Identify the electrophile and the nucleophile in each of the following reaction steps, and then draw curved arrows to illustrate the bond-making and bond-breaking processes.

a. What alkene would give only a ketone with three carbons as a product of oxidative cleavage?

b. What alkenes would give only an aldehyde with four carbons as a product of oxidative cleavage?

What stereoisomers are obtained from the following reactions?

a. trans-2-butene + HBr

b. (Z)-3-methyl-2-pentene + HBr

c. (E)-3-methyl-2-pentene + HBr

d. cis-3-hexene + HBr

e. cis-2-pentene + Br2

f. 1-hexene + Br2
See all solutions

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