Ch.8 - Reactions of Alkenes

Wade9th EditionOrganic ChemistryISBN: 9780135213728Not the one you use?Change textbook

Wade 9th Edition

Ch.8 - Reactions of Alkenes

Problem 28c

Chapter 8, Problem 28c

Show how you would accomplish each of the following synthetic conversions.
(c)

Verified step by step guidance

Step 1: Convert cyclohexanol to cyclohexene by performing an acid-catalyzed dehydration reaction. Use a strong acid like H2SO4 or H3PO4 to remove water and form the double bond.

Step 2: Perform a halogenation reaction on cyclohexene. React cyclohexene with Cl2 in an inert solvent like CCl4 to add two chlorine atoms across the double bond, forming 1,2-dichlorocyclohexane.

Step 3: Ensure stereochemistry is considered during the halogenation step. The addition of Cl2 will proceed via a cyclic halonium ion intermediate, leading to anti-addition of chlorine atoms.

Step 4: Verify the product structure to ensure it matches the desired 1,2-dichlorocyclohexane with the correct stereochemistry.

Step 5: Purify the product using techniques like distillation or recrystallization, if necessary, to isolate the final compound.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Nucleophilic Substitution

Nucleophilic substitution is a fundamental reaction in organic chemistry where a nucleophile attacks an electrophile, resulting in the replacement of a leaving group. In the context of converting cyclohexanol to a dichlorinated product, the hydroxyl group (-OH) of cyclohexanol can be replaced by chlorine atoms through a nucleophilic substitution mechanism, typically involving reagents like thionyl chloride (SOCl2) or phosphorus trichloride (PCl3).

Reactivity of Alcohols

Alcohols, such as cyclohexanol, are reactive compounds that can undergo various transformations. The hydroxyl group in alcohols can be converted into better leaving groups, facilitating substitution reactions. Understanding the reactivity of alcohols is crucial for predicting the outcome of synthetic conversions, including the formation of chlorinated derivatives.

Stereochemistry

Stereochemistry refers to the spatial arrangement of atoms in molecules and how this affects their chemical behavior. In the conversion of cyclohexanol to a dichlorinated product, the stereochemistry of the resulting compound is important, as the position of the chlorine atoms can lead to different isomers. Recognizing the stereochemical implications of reactions helps in understanding the properties and reactivity of the final product.

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Related Practice

Textbook Question

Predict the products, including stereochemistry where appropriate, for the m-chloroperoxybenzoic acid epoxidations of the following alkenes.

c. cis-cyclodecene

d. trans-cyclodecene

Textbook Question

Show how you would accomplish each of the following synthetic conversions.

a. trans-but-2-ene → trans-1,2-dimethylcyclopropane

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Textbook Question

a. Propose a mechanism for the conversion of cis-hex-3-ene to the epoxide (3,4-epoxyhexane) and the ring-opening reaction to give the glycol, hexane-3,4-diol. In your mechanism, pay particular attention to the stereochemistry of the intermediates and products.

b. Repeat part (a) for trans-hex-3-ene. Compare the products obtained from cis- and trans-hex-3-ene. Is this reaction sequence stereospecific?

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Textbook Question

Show how you would accomplish each of the following synthetic conversions.

(b)

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Textbook Question

Predict the products, including stereochemistry where appropriate, for the m-chloroperoxybenzoic acid epoxidations of the following alkenes.

a. cis-hex-2-ene

b. trans-hex-2-ene

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Textbook Question