Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination

Mullins - Organic Chemistry: A Learner Centered Approach 1st Edition

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Mullins 1st Edition

Ch. 13 - Alcohols, Ethers and Related Compounds: Substitution and Elimination

Problem 28b

Chapter 12, Problem 28b

Predict the product of the following reactions.
(b)

Verified step by step guidance

Step 1: Analyze the reactant structure. The molecule contains a secondary alcohol group (-OH) attached to a chiral carbon. The reaction involves HCl, which suggests an acid-catalyzed substitution reaction.

Step 2: Understand the mechanism. In the presence of HCl, the hydroxyl group (-OH) will be protonated to form water (H2O), a good leaving group. This step facilitates the formation of a carbocation intermediate.

Step 3: Consider carbocation stability. The secondary carbocation formed after the departure of water is relatively stable. No rearrangement is expected since the secondary carbocation is not adjacent to a more stable tertiary position.

Step 4: Nucleophilic attack. The chloride ion (Cl⁻) from HCl will act as a nucleophile and attack the carbocation, leading to the formation of a new C-Cl bond.

Step 5: Predict stereochemistry. Since the reaction proceeds via a carbocation intermediate, the product will likely be a racemic mixture due to the planar nature of the carbocation, allowing attack from either side.

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Key Concepts

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

Reaction Mechanisms

Understanding reaction mechanisms is crucial in organic chemistry as they describe the step-by-step process by which reactants transform into products. This includes identifying intermediates, transition states, and the movement of electrons. Familiarity with mechanisms helps predict the outcome of reactions and the stability of products formed.

Functional Groups

Functional groups are specific groups of atoms within molecules that are responsible for the characteristic chemical reactions of those molecules. Recognizing functional groups allows chemists to predict reactivity patterns and the types of reactions that can occur, which is essential for predicting products in organic reactions.

Stereochemistry

Stereochemistry involves the study of the spatial arrangement of atoms in molecules and how this affects their chemical behavior. It is important for predicting the products of reactions, especially in cases where chirality or geometric isomerism is involved, as different stereoisomers can lead to different products with distinct properties.

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Related Practice

Textbook Question

On the reaction coordinate diagram for the disfavored nucleophilic displacement of hydroxide, predict the curve that would demonstrate how using a tosylate makes the substitution favorable.

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Textbook Question

Provide an arrow-pushing mechanism that rationalizes the outcome of the reaction shown.

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Textbook Question

Complete the following multistep syntheses using tosylate formation as one of the steps. The optimum number of steps for each synthesis is shown.

(c)

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Textbook Question

Using an excess of HCl in the following reaction resulted in a product that was not simply the substitution of chlorine for the hydroxyl group. Predict the identity of the product obtained.

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Textbook Question

When SOCl₂ is used in place of HCl, only one product results. Why are these conditions better?

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Textbook Question

Predict the product of the following reactions.

(a)

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