Textbook Question
b. A small amount of a product containing a six-membered ring is also formed. Draw the structure of that product.
c. Why is so little six-membered ring product formed?
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10. Addition Reactions
Epoxide Reactions
4:29 minutesProblem 23
Textbook Question
Cellosolve® is the trade name for 2-ethoxyethanol, a common industrial solvent. This compound is produced in chemical plants that use ethylene as their only organic feedstock. Show how you would accomplish this industrial process.
Verified step by step guidance1
Step 1: Begin with ethylene (C₂H₄) as the organic feedstock. Ethylene is a simple alkene with a double bond between two carbon atoms.
Step 2: Perform an epoxidation reaction on ethylene to convert it into ethylene oxide (oxirane). This can be achieved using a peracid, such as m-chloroperoxybenzoic acid (mCPBA), or other suitable oxidizing agents.
Step 3: React ethylene oxide with ethanol (C₂H₅OH) in the presence of an acid catalyst, such as sulfuric acid (H₂SO₄), to open the epoxide ring and form 2-ethoxyethanol. The acid catalyst facilitates the nucleophilic attack of ethanol on the epoxide ring.
Step 4: Purify the product mixture to isolate 2-ethoxyethanol. This can involve distillation or other separation techniques to remove impurities and unreacted starting materials.
Step 5: Confirm the structure and purity of 2-ethoxyethanol using analytical techniques such as nuclear magnetic resonance (NMR) spectroscopy or gas chromatography (GC).
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4mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Ethanol and Ethylene Chemistry
Ethanol (C2H5OH) is a simple alcohol that can be derived from ethylene (C2H4) through a hydration reaction. This process involves the addition of water to ethylene in the presence of an acid catalyst, resulting in the formation of ethanol. Understanding this reaction is crucial for producing 2-ethoxyethanol, as it serves as a precursor in the synthesis.
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Ether Formation
2-Ethoxyethanol is classified as an ether, specifically an ethyl ether. Ethers are formed through the reaction of alcohols with alkyl halides or through the condensation of two alcohol molecules. In the case of 2-ethoxyethanol, the reaction involves the nucleophilic attack of ethanol on an ethylene oxide intermediate, leading to the formation of the ether bond.
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Industrial Synthesis Processes
Industrial synthesis processes often utilize continuous flow reactors and catalytic methods to optimize yield and efficiency. In the production of 2-ethoxyethanol, controlling reaction conditions such as temperature, pressure, and catalyst type is essential to maximize the conversion of ethylene and minimize by-products. Understanding these industrial practices is vital for scaling up the synthesis from laboratory to production levels.
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