ORGANIC CHEMISTRY
ORGANIC CHEMISTRY
5th Edition
ISBN: 9781259977596
Author: SMITH
Publisher: MCG
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 8, Problem 8.68P

(a) Draw all products formed by treatment of each dibromide (A and B) with one equivalent of NaNH 2 . (b) Label pairs of diastereomers and constitutional isomers.

Chapter 8, Problem 8.68P, 8.68 (a) Draw all products formed by treatment of each dibromide (A and B) with one equivalent of .

                  A                                       B

Expert Solution
Check Mark
Interpretation Introduction

(a)

Interpretation: All products formed by the treatment of the given dibromide (A and B) with one equivalent of NaNH2 is to be drawn.

Concept introduction: The two-step unimolecular elimination reaction that favors the removal of a HX substituent and the formation of a carbocation intermediate takes place in its first step. In the second step of the reaction, the carbocation forms a double bond. This type of reaction is termed E1 elimination reaction.

The one-step bimolecular elimination reaction that favors the removal of a proton by a base from carbon adjacent to the leaving group that results in the formation of a carbocation is termed as E2 elimination reaction. The formation of a double bond takes place simultaneously through the carbocation to form an alkene as the desired product.

Answer to Problem 8.68P

The products that formed by the treatment of the given dibromide A with one equivalent of NaNH2 are (I)-(Z)1(1bromo2phenylvinyl)3methylbenzene and (II)-(Z)1(2bromo2phenylvinyl)3methylbenzene. The products that formed by the treatment of the given dibromide B with one equivalent of NaNH2 are (III)-(Z)1(1bromo2phenylvinyl)3methylbenzene and (IV)-(Z)1(2bromo2phenylvinyl)3methylbenzene.

Explanation of Solution

The reaction of dibromide A with one equivalent of NaNH2 results in the elimination of one mole of HBr. The corresponding chemical reaction is shown below.

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  1

Figure 1

In this reaction, the given dihalide undergoes elimination reaction in the presence of one equivalent of the strong base, NaNH2, that results in the formation of two alkene products, (I)-(Z)1(1bromo2phenylvinyl)3methylbenzene and (II)-(Z)1(2bromo2phenylvinyl)3methylbenzene.

The reaction of dibromide B with one equivalent of NaNH2 results in the elimination of one mole of HBr. The corresponding chemical reaction is shown as,

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  2

Figure 2

In this reaction, the given dihalide undergoes elimination reaction in the presence of one equivalent of the strong base, NaNH2, that results in the formation of two alkene products, (III)-(Z)1(1bromo2phenylvinyl)3methylbenzene and (IV)-(Z)1(2bromo2phenylvinyl)3methylbenzene.

Conclusion

The products that formed by the treatment of the given dibromide A with one equivalent of NaNH2 are (I)-(Z)1(1bromo2phenylvinyl)3methylbenzene and (II)-(Z)1(2bromo2phenylvinyl)3methylbenzene. The products that formed by the treatment of the given dibromide B with one equivalent of NaNH2 are (III)-(Z)1(1bromo2phenylvinyl)3methylbenzene and (IV)-(Z)1(2bromo2phenylvinyl)3methylbenzene.

Expert Solution
Check Mark
Interpretation Introduction

(b)

Interpretation: The labeling of the pairs of diastereomers and constitutional isomers are to be shown.

Concept introduction: Diastereomers compounds are not mirror images of each other and are different in configuration at one or more stereocentres.

The isomers which have same molecular formula but different connectivity of atoms are constitutional isomers.

Answer to Problem 8.68P

The labeling of the pairs of diastereomers is,

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  3

The labeling of the pairs of constitutional isomers is,

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  4

Explanation of Solution

The first pair of diastereomers is shown as,

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  5

Figure 3

Thus, the products (I) and (III) are diastereomers that are not mirror images of each other and are differ in configuration.

The second pair of diastereomers is shown as,

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  6

Figure 4

Thus, the products (II) and (IV) are diastereomers that are not mirror images of each other and are differ in configuration. (I), (II) and (III),(IV) are constitutional isomers as they differ only in arrangement of bonds.

The first pair of constitutional isomers is shown as,

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  7

Figure 5

Thus, the products (I) and (II) are constitutional isomers as they possess different arrangement of bonds.

The first pair of constitutional isomers is shown as,

ORGANIC CHEMISTRY, Chapter 8, Problem 8.68P , additional homework tip  8

Figure 6

Thus, the products (III) and (IV) are constitutional isomers as they possess different arrangement of bonds.

Conclusion

The labeling of the pairs of diastereomers is shown in Figure 3 and Figure 4. The labeling of the pairs of constitutional isomers is shown in Figure 5 and Figure 6.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
Show work. don't give Ai
Show work with explanation needed. don't give Ai generated solution
Show work with explanation needed. Don't give Ai generated solution

Chapter 8 Solutions

ORGANIC CHEMISTRY

Ch. 8 - Prob. 8.11PCh. 8 - Problem 8.12 What alkenes are formed from each...Ch. 8 - Prob. 8.13PCh. 8 - Problem 8.14 What alkenes are formed from each...Ch. 8 - Problem 8.15 How does each of the following...Ch. 8 - Problem 8.16 Draw both the SN1 and E1 products of...Ch. 8 - Prob. 8.17PCh. 8 - Prob. 8.18PCh. 8 - Problem 8.19 Explain why...Ch. 8 - Prob. 8.20PCh. 8 - Problem 8.21 Draw the alkynes formed when each...Ch. 8 - Problem 8.22 Draw the products in each...Ch. 8 - Problem 8.23 Draw a stepwise mechanism for the...Ch. 8 - 8.24 Rank the alkenes shown in the ball-and-stick...Ch. 8 - Prob. 8.25PCh. 8 - 8.26 What is the major E2 elimination product...Ch. 8 - Prob. 8.27PCh. 8 - Prob. 8.28PCh. 8 - Prob. 8.29PCh. 8 - 8.30 Label each pair of alkenes as constitutional...Ch. 8 - Prob. 8.31PCh. 8 - Prob. 8.32PCh. 8 - Prob. 8.33PCh. 8 - For each of the following alkenes, draw the...Ch. 8 - Prob. 8.35PCh. 8 - Prob. 8.36PCh. 8 - Prob. 8.37PCh. 8 - What alkene is the major product formed from each...Ch. 8 - Prob. 8.39PCh. 8 - Prob. 8.40PCh. 8 - Pick the reactant or solvent in each part that...Ch. 8 - 8.42 In the dehydrohalogenation of...Ch. 8 - Prob. 8.43PCh. 8 - Prob. 8.44PCh. 8 - Prob. 8.45PCh. 8 - Prob. 8.46PCh. 8 - Prob. 8.47PCh. 8 - Prob. 8.48PCh. 8 - What alkyl chloride affords the following alkene...Ch. 8 - Draw the products formed when each dihalide is...Ch. 8 - Draw the structure of a dihalide that could be...Ch. 8 - Under certain reaction conditions, 2,...Ch. 8 - For which reaction mechanisms, SN1, SN2, E1 or...Ch. 8 - Draw the organic products formed in each...Ch. 8 - Prob. 8.55PCh. 8 - Draw all products, including stereoisomers, in...Ch. 8 - Draw all of the substitution and elimination...Ch. 8 - Prob. 8.58PCh. 8 - 8.59 Draw a stepwise, detailed mechanism for each...Ch. 8 - Draw the major product formed when...Ch. 8 - Draw a stepwise, detailed mechanism for the...Ch. 8 - Explain why the reaction of with gives ...Ch. 8 - Draw a stepwise detailed mechanism that...Ch. 8 - Prob. 8.64PCh. 8 - 8.65 Explain the selectivity observed in the...Ch. 8 - Prob. 8.66PCh. 8 - Prob. 8.67PCh. 8 - 8.68 (a) Draw all products formed by treatment of...
Knowledge Booster
Background pattern image
Chemistry
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Chemistry
Chemistry
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Cengage Learning
Text book image
Chemistry
Chemistry
ISBN:9781259911156
Author:Raymond Chang Dr., Jason Overby Professor
Publisher:McGraw-Hill Education
Text book image
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning
Text book image
Organic Chemistry
Chemistry
ISBN:9780078021558
Author:Janice Gorzynski Smith Dr.
Publisher:McGraw-Hill Education
Text book image
Chemistry: Principles and Reactions
Chemistry
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:Cengage Learning
Text book image
Elementary Principles of Chemical Processes, Bind...
Chemistry
ISBN:9781118431221
Author:Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:WILEY
Chapter 4 Alkanes and Cycloalkanes Lesson 2; Author: Linda Hanson;https://www.youtube.com/watch?v=AL_CM_Btef4;License: Standard YouTube License, CC-BY
Chapter 4 Alkanes and Cycloalkanes Lesson 1; Author: Linda Hanson;https://www.youtube.com/watch?v=PPIa6EHJMJw;License: Standard Youtube License