What is the major product obtained from treating an excess of each of the following compounds with Cl2 in the presence of ultraviolet light at room temperature? Disregard stereoisomers.a.

Ch. 12 - Radicals

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Bruice 8th Edition

Ch. 12 - Radicals

Problem 29a

Chapter 13, Problem 29a

What is the major product obtained from treating an excess of each of the following compounds with Cl₂ in the presence of ultraviolet light at room temperature? Disregard stereoisomers.
a.

Verified step by step guidance

Step 1: Recognize the reaction type. The reaction involves the treatment of the compound with Cl₂ in the presence of ultraviolet (UV) light, which indicates a free radical halogenation reaction. This reaction typically occurs at the most reactive hydrogen positions.

Step 2: Analyze the structure of the compound. The given compound is a cyclohexane ring with two methyl groups attached at different positions. Identify all the types of hydrogens present: primary, secondary, and tertiary.

Step 3: Determine the reactivity of hydrogens. In free radical halogenation, tertiary hydrogens are the most reactive, followed by secondary hydrogens, and then primary hydrogens. Locate the tertiary hydrogens in the molecule, if any.

Step 4: Predict the major product. Since the reaction is performed in excess Cl₂, the chlorine will replace the most reactive hydrogen (likely tertiary or secondary) to form the major product. Consider the positions of the methyl groups and the hydrogens attached to the ring carbons.

Step 5: Disregard stereoisomers. The problem specifies to disregard stereoisomers, so focus only on the connectivity of the atoms in the major product without considering spatial arrangement.

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Key Concepts

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

Free Radical Halogenation

Free radical halogenation is a reaction where alkanes react with halogens (like Cl2) in the presence of ultraviolet light, leading to the substitution of hydrogen atoms with halogen atoms. This process involves the formation of free radicals, which are highly reactive species that drive the reaction forward. The reaction typically proceeds through initiation, propagation, and termination steps, resulting in various halogenated products.

Excess Reagent Effect

Using an excess of a reagent, such as Cl2, influences the reaction outcome by favoring the formation of the major product. In free radical halogenation, an excess of Cl2 increases the likelihood of multiple substitution reactions occurring, leading to more halogen atoms being incorporated into the organic molecule. This can result in a more heavily halogenated product, which is crucial for predicting the major product formed.

Reaction Conditions and Temperature

The reaction conditions, including the presence of ultraviolet light and room temperature, are critical in free radical halogenation. Ultraviolet light provides the energy needed to initiate the formation of free radicals from Cl2, while room temperature ensures that the reaction proceeds without excessive energy that could lead to side reactions. Understanding these conditions helps predict the efficiency and selectivity of the halogenation process.