What is the major product of the reaction in Problem 7 when the alkane reacts with Cl2 instead of with Br2? Disregard stereoisomers.

Ch. 12 - Radicals

Bruice8th EditionOrganic ChemistryISBN: 9780135213711Not the one you use?Change textbook

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Bruice 8th Edition

Ch. 12 - Radicals

Problem 8a

Chapter 13, Problem 8a

What is the major product of the reaction in Problem 7 when the alkane reacts with Cl₂ instead of with Br₂? Disregard stereoisomers.

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Identify the type of reaction: The reaction involves the halogenation of an alkane with Cl₂, which proceeds via a free radical substitution mechanism. This mechanism includes initiation, propagation, and termination steps.

Understand the reactivity of chlorine: Chlorine is more reactive and less selective than bromine in free radical halogenation. This means that chlorine will react with all types of hydrogen atoms (primary, secondary, and tertiary) but will favor the most abundant hydrogens due to its lower selectivity.

Analyze the structure of the alkane: Determine the number and types of hydrogens (primary, secondary, tertiary) present in the alkane. This will help predict the possible sites for substitution.

Predict the major product: Since chlorine is less selective, the major product will depend on both the reactivity of the hydrogen atoms and their abundance. Calculate the relative likelihood of substitution at each type of hydrogen by considering both the reactivity and the number of hydrogens available.

Write the structure of the major product: Replace one hydrogen atom at the most likely substitution site with a chlorine atom to form the major product. Disregard stereoisomers as instructed in the problem.

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Key Concepts

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

Halogenation of Alkanes

Halogenation is a reaction where alkanes react with halogens (like Cl2 or Br2) to form alkyl halides. This process typically involves a free radical mechanism, where the halogen molecule dissociates into two halogen radicals, which then abstract hydrogen atoms from the alkane, leading to the formation of a halogenated product.

Selectivity of Halogens

Different halogens exhibit varying selectivity in their reactions with alkanes. Chlorination (with Cl2) tends to produce a mixture of products due to its higher reactivity and less selectivity compared to bromination (with Br2), which favors the formation of more stable products. Understanding this selectivity is crucial for predicting the major product in halogenation reactions.

Radical Stability

The stability of the radical intermediates formed during halogenation significantly influences the product distribution. Tertiary radicals are more stable than secondary or primary radicals, leading to preferential formation of products that result from the abstraction of hydrogen from more substituted carbons. This concept is essential for predicting the major product when alkanes react with halogens.