11. Radical Reactions

Provide the expected product for the reaction of each of the following alkenes with (i) HBr and (ii) HBr, H₂O₂

(b)

Provide the expected product for the reaction of each of the following alkenes with (i) HBr and (ii) HBr, H₂O₂

(c)

Provide the expected product for the reaction of each of the following alkenes with (i) HBr and (ii) HBr, H₂O₂.

(d)

Which reagent system (HBr or HBr, H₂O₂) would you use to carry out the following transformations?

(a)

Which reagent system (HBr or HBr, H₂O₂) would you use to carry out the following transformations?

(b)

Provide an arrow-pushing mechanism that rationalizes the formation of each of the products you predicted in Assessment 8.35 (ii). Make sure your mechanism accounts for all products formed, including stereoisomers and regioisomers, where applicable.

Propose a mechanism for the reaction of pent-1-yne with HBr in the presence of peroxides. Show why anti-Markovnikov orientation results.

At the beginning of Chapter 9, we stated that after finishing Chapters 8 and 9, we would have the ability to make a large variety of functional groups using related reactions. Show the reagent(s) necessary to convert 1-isobutylcyclohexene into the following molecules.

(f)

Predict the product of the following alkene addition reactions.

(a)

Predict the product of the following alkene addition reactions.

(c)

Suggest a mechanism for the following reactions.

(b)

Provide the mechanism of the radical reactions shown.

(a)

What alkyl halide will be obtained in greatest yield? Ignore stereoisomers.

d.

What alkyl halide will be obtained in greatest yield? Ignore stereoisomers.

c.

What five-carbon alkene forms the same product whether it reacts with HBr in the presence of a peroxide or with HBr in the absence of a peroxide?