Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Concept explainers

Reactions at the Alpha Carbon Atom
The position next to the ketone or aldehyde functional group is termed as alpha position and the reaction which occurs at alpha position is called alpha substitution reaction. In an alpha substitution reaction, the alpha proton atom is substituted by an …
Question

Consider diastereomers X and Y shown below.

Cl

diastereomer X

Cl

HO

H

OH

H

Each diastereomer, if treated with sodium ethoxide (NaOCH2CH3), undergoes an E2 reaction.

  1. One of the diastereomers undergoes an E2 to make a single compound. The other diastereomers undergoes E2 eliminations leading to two different compounds. Draw the mechanisms for all three of these E2 reactions, being sure to use conformational structures for the substrate in each reaction.

  2. Which of the two diastereomers will undergo an E2 reaction at the faster rate? Why? (In organic chemistry it is often said one picture is worth a thousand words. Be sure to include a picture that supports whatever argument you are making.

IV Compare and Contrast Consider diastereomers X and Y shown below. 'CI "CI diastereomer X diastereomer Y Each diastereomer, if treated with sodium ethoxide (NaOCH2CH:), undergoes an E2 reaction. a. One of the diastereomers undergoes an E2 to make a single compound. The other diastereomers undergoes E2 eliminations leading to two different compounds. Draw the mechanisms for all three of these E2 reactions, being sure to use conformational structures for the substrate in each reaction. b. Which of the two diastereomers will undergo an E2 reaction at the faster rate? Why? (In organic chemistry it is often said one picture is worth a thousand words. Be sure to include a picture that supports whatever argument you are making.
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Transcribed Image Text:IV Compare and Contrast Consider diastereomers X and Y shown below. 'CI "CI diastereomer X diastereomer Y Each diastereomer, if treated with sodium ethoxide (NaOCH2CH:), undergoes an E2 reaction. a. One of the diastereomers undergoes an E2 to make a single compound. The other diastereomers undergoes E2 eliminations leading to two different compounds. Draw the mechanisms for all three of these E2 reactions, being sure to use conformational structures for the substrate in each reaction. b. Which of the two diastereomers will undergo an E2 reaction at the faster rate? Why? (In organic chemistry it is often said one picture is worth a thousand words. Be sure to include a picture that supports whatever argument you are making.
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