Table of contents

1. A Review of General Chemistry5h 5m
2. Molecular Representations1h 14m
3. Acids and Bases2h 46m
4. Alkanes and Cycloalkanes4h 17m
5. Chirality3h 39m
6. Thermodynamics and Kinetics1h 22m
7. Substitution Reactions1h 48m
8. Elimination Reactions2h 30m
9. Alkenes and Alkynes2h 9m
10. Addition Reactions3h 19m
11. Radical Reactions1h 58m
12. Alcohols, Ethers, Epoxides and Thiols2h 42m
13. Alcohols and Carbonyl Compounds2h 17m
14. Synthetic Techniques1h 26m
15. Analytical Techniques:IR, NMR, Mass Spect7h 3m
16. Conjugated Systems6h 13m
17. Ultraviolet Spectroscopy51m
18. Aromaticity2h 34m
19. Reactions of Aromatics: EAS and Beyond5h 1m
20. Phenols55m
21. Aldehydes and Ketones: Nucleophilic Addition4h 56m
22. Carboxylic Acid Derivatives: NAS2h 51m
23. The Chemistry of Thioesters, Phophate Ester and Phosphate Anhydrides1h 10m
24. Enolate Chemistry: Reactions at the Alpha-Carbon1h 53m
25. Condensation Chemistry2h 9m
26. Amines1h 43m
27. Heterocycles2h 0m
28. Carbohydrates5h 53m
29. Amino Acids4h 20m
30. Peptides and Proteins2h 42m
31. Catalysis in Organic Reactions1h 30m
32. Lipids 2h 50m
33. The Organic Chemistry of Metabolic Pathways2h 52m
34. Nucleic Acids1h 32m
35. Transition Metals6h 14m
36. Synthetic Polymers1h 49m

36. Synthetic Polymers

Step-Growth Polymers: Polyurethane Mechanism

Organic Chemistry

36. Synthetic Polymers

Step-Growth Polymers: Polyurethane Mechanism

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Multiple Choice

Determine the monomer created from the reaction between toluene diisocyanate and ethylene diol.

Chemical structure of a monomer formed from toluene diisocyanate and ethylene diol.

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Verified step by step guidance

Identify the functional groups in the reactants: Toluene diisocyanate contains two isocyanate groups (\( \text{NCO} \)), and ethylene diol contains two hydroxyl groups (\( \text{OH} \)).

Understand the reaction mechanism: The isocyanate group reacts with the hydroxyl group to form a urethane linkage. This involves the nucleophilic attack of the hydroxyl oxygen on the carbon of the isocyanate group, forming a carbamate (urethane) linkage.

Visualize the structure of the monomer: The reaction between one isocyanate group and one hydroxyl group forms a urethane linkage, \( \text{NHCOO} \). Since both reactants are di-functional, the reaction will form a linear monomer with urethane linkages at both ends.

Consider the repeating unit: The monomer formed will have a structure where the urethane linkage connects the aromatic ring of toluene diisocyanate to the ethylene chain of ethylene diol.

Analyze the images: The images provided show structures with urethane linkages, indicating the formation of a monomer with the expected urethane linkage between the aromatic ring and the ethylene chain.