Textbook Question
How can the following compounds be prepared from the given starting materials?
c.
13. Alcohols and Carbonyl Compounds
Organometallic Cumulative Practice
5:41 minutesProblem 57a(7)
Textbook Question
a. Show the reagents required to form the primary alcohol in each of the following reactions.
Verified step by step guidance1
Step 1: Identify the starting material and the product. The starting material is an epoxide (a three-membered cyclic ether), and the product is a primary alcohol.
Step 2: Recognize the type of reaction. This is a ring-opening reaction of the epoxide to form a primary alcohol. The nucleophile attacks the less substituted carbon of the epoxide due to steric hindrance.
Step 3: Choose the appropriate nucleophile and acidic or basic conditions. To form a primary alcohol, water (H₂O) can act as the nucleophile, and an acid catalyst such as H⁺ (e.g., H₂SO₄) is typically used to protonate the epoxide and facilitate the ring opening.
Step 4: Describe the mechanism. The epoxide is protonated by the acid catalyst, making the oxygen more electrophilic. Water then attacks the less substituted carbon of the epoxide, leading to the formation of the primary alcohol.
Step 5: Summarize the reagents required. The reaction requires water (H₂O) as the nucleophile and an acid catalyst (e.g., H₂SO₄) to form the primary alcohol from the epoxide.
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5mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Epoxide Chemistry
Epoxides are three-membered cyclic ethers that are highly reactive due to the strain in their ring structure. They can undergo ring-opening reactions in the presence of nucleophiles, leading to the formation of various products, including alcohols. Understanding the mechanism of epoxide ring-opening is crucial for predicting the outcome of reactions involving these compounds.
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General properties of epoxidation.
Nucleophilic Attack
Nucleophilic attack is a fundamental concept in organic chemistry where a nucleophile, which is an electron-rich species, attacks an electron-deficient center, such as a carbon atom in an epoxide. This process often leads to the formation of new bonds and is essential for converting epoxides into alcohols. The regioselectivity of the attack can influence the final product's structure.
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Reagents for Alcohol Formation
To convert an epoxide into a primary alcohol, specific reagents are required. Typically, a nucleophile such as water or an alcohol is used in the presence of an acid catalyst to facilitate the ring-opening. The choice of nucleophile and conditions can determine whether the resulting alcohol is primary, secondary, or tertiary, making it important to select the appropriate reagents for the desired outcome.
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