Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

Bruice8th EditionOrganic ChemistryISBN: 9780135213711Non è quello che usi tu?Cambia libro di testo

Bruice 8th Edition

Ch. 10 - Reactions of Alcohols, Ethers, Epoxides, Amines, and Sulfur-Containing Compounds

Problema 60c

Capitolo 10, Problema 60c

What is the major product obtained from the reaction of 2-ethyloxirane with each of the following reagents?
c. 0.1MNaOH

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Identify the structure of 2-ethyloxirane. It is an epoxide (a three-membered cyclic ether) with an ethyl group attached to one of the carbons in the ring.

Understand the reactivity of epoxides in the presence of a base like NaOH. Epoxides are highly strained and reactive, and bases can open the ring via a nucleophilic attack.

Determine the site of nucleophilic attack. In basic conditions, the nucleophile (OH⁻) will attack the less substituted carbon of the epoxide due to steric hindrance and electronic effects.

Write the mechanism for the reaction. The OH⁻ attacks the less substituted carbon of the epoxide, breaking the C-O bond and opening the ring. This results in the formation of a diol (a molecule with two hydroxyl groups).

Assign the stereochemistry of the product. The nucleophilic attack occurs with inversion of configuration at the carbon being attacked, while the other carbon retains its configuration. Ensure the final product reflects this stereochemical outcome.

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Epoxide Reactivity

Epoxides, or oxiranes, are three-membered cyclic ethers that are highly reactive due to the strain in their ring structure. This strain makes them susceptible to nucleophilic attack, which can lead to ring-opening reactions. Understanding how epoxides react with nucleophiles is crucial for predicting the products of reactions involving them.

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General properties of epoxidation.

Nucleophilic Substitution

Nucleophilic substitution is a fundamental reaction mechanism in organic chemistry where a nucleophile replaces a leaving group in a molecule. In the case of epoxides, a nucleophile such as hydroxide ion (OH-) can attack the less hindered carbon atom of the epoxide, leading to the opening of the ring and the formation of an alcohol. This concept is essential for determining the major product of the reaction.

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Nucleophiles and Electrophiles can react in Substitution Reactions.

Regioselectivity

Regioselectivity refers to the preference of a chemical reaction to occur at one site over another in a molecule. In the context of epoxide reactions, the regioselectivity is influenced by steric and electronic factors, which dictate which carbon atom in the epoxide is attacked by the nucleophile. Understanding regioselectivity helps in predicting the specific product formed when 2-ethyloxirane reacts with NaOH.

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05:09

Heck Reaction

Pratica correlata

Domanda del libro di testo

When heated with H₂SO4, both 3,3-dimethyl-2-butanol and 2,3-dimethyl-2-butanol are dehydrated to form 2,3-dimethyl-2-butene. Which alcohol dehydrates more rapidly?

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Domanda del libro di testo

What is the major product obtained from the reaction of 2-ethyloxirane with each of the following reagents?

a. 0.1MHCl

b. CH₃OH/HCl

602

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Domanda del libro di testo

Starting with (R)-1-deuterio-1-propanol, how could you prepare

c. (R)-1-deuterio-1-methoxypropane?

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