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Ch. 5 - Chemical Reaction Analysis: Thermodynamics and Kinetics
Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition
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Tutti i libri di testoMullins 1st EditionCh. 5 - Chemical Reaction Analysis: Thermodynamics and KineticsProblema 52e
Capitolo 4, Problema 52e

Predict the product(s) of the following halogenation reactions. Only one equivalent of the halogen is used in each case. If the reaction proceeds selectively, indicate this by only drawing the major product. If the reaction is not selective, draw all possible products.
(e)

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Step 1: Recognize that the reaction involves bromination under heat, which suggests a radical halogenation mechanism. Bromine (Br₂) reacts selectively with the most stable radical intermediate.
Step 2: Identify the structure of the starting alkane. The molecule shown is 2-methylpentane, which has primary, secondary, and tertiary hydrogens available for abstraction.
Step 3: Determine the stability of the possible radicals formed by hydrogen abstraction. Tertiary radicals are the most stable, followed by secondary, and then primary radicals.
Step 4: Predict the major product based on the selective nature of bromination. Bromine will preferentially abstract a hydrogen from the tertiary carbon, leading to the formation of the major product where bromine is attached to the tertiary carbon.
Step 5: If the reaction is not completely selective, consider the possibility of minor products formed by bromination at secondary or primary carbons. Draw all possible products, but emphasize the major product formed at the tertiary position.

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Halogenation Reactions

Halogenation refers to the chemical reaction where a halogen atom (such as chlorine or bromine) is introduced into a compound, typically an alkane or alkene. This process can occur through radical mechanisms or electrophilic addition, depending on the substrate and conditions. Understanding the mechanism is crucial for predicting the products formed during the reaction.
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Halogenation Mechanism

Selectivity in Reactions

Selectivity in organic reactions refers to the preference of a reaction pathway that leads to the formation of a major product over other possible products. Factors influencing selectivity include the stability of intermediates, steric hindrance, and the nature of the reactants. Recognizing whether a reaction is selective helps in accurately predicting the predominant product.
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Radical selectivity: Food Analogy

Product Prediction

Product prediction involves determining the expected outcomes of a chemical reaction based on the reactants and reaction conditions. This includes identifying all possible products, especially in cases where multiple products can form due to non-selective reactions. A thorough understanding of functional groups and reaction mechanisms is essential for making accurate predictions.
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Predict the Products
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Predict the product(s) of the following halogenation reactions. Only one equivalent of the halogen is used in each case. If the reaction proceeds selectively, indicate this by only drawing the major product. If the reaction is not selective, draw all possible products.

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For each set of reactive intermediates, rank them in order of reactivity (1 = most reactive).

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Predict the product(s) of the following halogenation reactions. Only one equivalent of the halogen is used in each case. If the reaction proceeds selectively, indicate this by only drawing the major product. If the reaction is not selective, draw all possible products.

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