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Provide reasonable starting materials for the following reagents and products. LDA C=CH

Provide reasonable starting materials for the following reagents and products. LDA C=CH

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Title: Synthesis Reactions: Identifying Starting Materials for Given Reagents and Products** **Objective:** To determine suitable starting materials for the chemical reactions that yield the provided products using specified reagents. **Reaction 1:** - **Reagent:** LDA (Lithium Diisopropylamide) - **Product:** The compound has a phenyl group (benzene ring) attached to a butene chain (four-carbon chain with a double bond). **Explanation:** - LDA is a strong, non-nucleophilic base commonly used to deprotonate carbon atoms adjacent to carbonyl groups, generating enolates. **Reaction 2:** - **Reagent:** Acetylide ion (C≡C^-H) - **Product:** The compound is a hydrocarbon with a three-carbon chain containing a triple bond (alkyne) and a remaining ethyl group. **Explanation:** - Acetylide ions are used to add carbon-carbon bonds, particularly in the synthesis of alkynes. **Diagrams:** - **Chemical Structures:** - The first product features a benzene ring attached to a carbon chain with a double bond on the third carbon. - The second product is a linear alkyne with three carbon atoms starting with an ethyl group followed by a triple bond. **Conclusion:** To synthesize the given products: - For the first reaction, consider starting with a carbonyl compound where the carbon adjacent to the group can form the intended enolate. - For the second reaction, think of using a halide or similar compound that can react with the acetylide ion to form the alkyne product.
Transcribed Image Text:**Title: Synthesis Reactions: Identifying Starting Materials for Given Reagents and Products** **Objective:** To determine suitable starting materials for the chemical reactions that yield the provided products using specified reagents. **Reaction 1:** - **Reagent:** LDA (Lithium Diisopropylamide) - **Product:** The compound has a phenyl group (benzene ring) attached to a butene chain (four-carbon chain with a double bond). **Explanation:** - LDA is a strong, non-nucleophilic base commonly used to deprotonate carbon atoms adjacent to carbonyl groups, generating enolates. **Reaction 2:** - **Reagent:** Acetylide ion (C≡C^-H) - **Product:** The compound is a hydrocarbon with a three-carbon chain containing a triple bond (alkyne) and a remaining ethyl group. **Explanation:** - Acetylide ions are used to add carbon-carbon bonds, particularly in the synthesis of alkynes. **Diagrams:** - **Chemical Structures:** - The first product features a benzene ring attached to a carbon chain with a double bond on the third carbon. - The second product is a linear alkyne with three carbon atoms starting with an ethyl group followed by a triple bond. **Conclusion:** To synthesize the given products: - For the first reaction, consider starting with a carbonyl compound where the carbon adjacent to the group can form the intended enolate. - For the second reaction, think of using a halide or similar compound that can react with the acetylide ion to form the alkyne product.
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