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Ch. 6 - The Reactions of Alkenes • The Stereochemistry of Addition Reactions
Bruice - Organic Chemistry 8th Edition
Bruice8th EditionOrganic ChemistryISBN: 9780135213711Not the one you use?Change textbook
Chapter 7, Problem 30b

What products are formed when the following compounds react with ozone and then with dimethyl sulfide?
b. Cyclohexene structure with a double bond and a CH2 group attached, illustrating a compound for ozonolysis reactions.

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1
Step 1: Recognize the reaction type. The problem involves ozonolysis, a reaction where ozone (O₃) cleaves double bonds in alkenes to form carbonyl compounds. The second step involves treatment with dimethyl sulfide (DMS), which reduces the ozonide intermediate to aldehydes or ketones.
Step 2: Analyze the structure of the given compound. The compound contains a cyclohexane ring with a double bond attached to a methyl group. The double bond is the reactive site for ozonolysis.
Step 3: Predict the cleavage of the double bond. Ozone will cleave the double bond into two fragments. Each carbon involved in the double bond will form a carbonyl group (either an aldehyde or ketone).
Step 4: Consider the role of dimethyl sulfide (DMS). DMS reduces the ozonide intermediate formed during ozonolysis into stable carbonyl compounds. This ensures that the products are aldehydes or ketones rather than carboxylic acids.
Step 5: Identify the products. The cleavage of the double bond will yield two carbonyl compounds: one from the methyl group side (a formaldehyde molecule) and one from the cyclohexane ring side (a ketone with the cyclohexane ring attached).

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Key Concepts

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

Ozonolysis

Ozonolysis is a reaction involving the cleavage of alkenes or alkynes using ozone (O3) to form carbonyl compounds, such as aldehydes and ketones. The reaction typically proceeds through the formation of a molozonide intermediate, which rearranges to yield ozonides. This process is crucial for determining the structure of organic compounds and is often followed by reductive workup, commonly using dimethyl sulfide (DMS) to convert ozonides into stable products.
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General properties of ozonolysis.

Dimethyl Sulfide (DMS) as a Reductant

Dimethyl sulfide (DMS) is frequently used as a reducing agent in organic chemistry, particularly in the reductive workup of ozonolysis reactions. It effectively reduces ozonides to aldehydes or ketones, facilitating the formation of stable products. DMS is favored for its mild reaction conditions and ability to selectively reduce ozonides without further oxidation of the carbonyl products.
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Reagents used to oxidize Sulfides.

Reaction Mechanism

Understanding the reaction mechanism of ozonolysis is essential for predicting the products formed. The mechanism involves the initial formation of a cyclic molozonide, which then rearranges to form a more stable ozonide. The subsequent reaction with DMS leads to the cleavage of the ozonide, resulting in the formation of carbonyl compounds. Familiarity with these steps allows chemists to anticipate the outcome of reactions involving ozone and various organic substrates.
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