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Chapter 24: Problem 40

Describe the intermediate that is thought to form in the addition of a hydrogen halide to an alkene, using cyclohexene as the alkene in your description.

Short Answer

Expert verified
The intermediate formed during the addition of hydrogen halide (HX) to cyclohexene is a cyclohexyl carbocation. The reaction mechanism follows electrophilic addition, including nucleophilic attack by the alkene and the release of the halide ion (X-). The carbocation is an electron-deficient species with a positive charge on the carbon atom and is highly reactive. It is immediately attacked by the halide ion to form the final product, cyclohexyl halide.

Step by step solution

01

Write down the overall reaction

The overall reaction of the addition of a hydrogen halide (HX) to an alkene (cyclohexene) can be written as follows: Cyclohexene + HX 鈫� Cyclohexyl Halide Here, X is the halogen (such as Cl, Br or I).
02

Explain the reaction mechanism

The reaction mechanism for the addition of HX to cyclohexene follows the electrophilic addition mechanism. It occurs via a two-step process which involves the formation of a carbocation intermediate. The mechanism can be summarized as follows: 1. Alkene acts as a nucleophile (electron-rich species) and attacks the hydrogen in the HX molecule (electrophile) forming a new carbon-hydrogen bond. In the process, the H-X bond breaks, and the halide ion (X-) is released. 2. The halide ion then attacks the carbocation (resulting from the first step) forming a carbon-halogen bond, generating the final cyclohexyl halide.
03

Describe the intermediate that is thought to form

The intermediate that forms during the reaction is a carbocation. In the case of cyclohexene and hydrogen halide, the intermediate carbocation is cyclohexyl carbocation. The carbocation is an electron-deficient species, with a positive charge on the carbon atom, which is the site of electrophilic attack (carbon double bond) in cyclohexene. Here is the structure of the cyclohexyl carbocation intermediate: ``` H H H H \| | | | H--C--C--C--H |\_/_/ C H | H ``` This intermediate is highly reactive and is immediately attacked by the halide ion (X-) in the second step of the reaction. This results in the formation of the final product, cyclohexyl halide.

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