(a) Interpretation: The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1 − C2 bond. Concept introduction: The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

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Answer 1

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Chapter 6, Problem 6.38AP

Interpretation Introduction

(a)

Interpretation:

The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1−C2 bond.

Concept introduction:

The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

Interpretation Introduction

(b)

Interpretation:

The chirality of each conformation of ephedrine is to be examined. The way in which chiralities of the conformation of ephedrine are related to the overall chirality of ephedrine is to be stated.

Concept introduction:

A carbon atom that has four nonequivalent atoms or groups attached to it is known as the chiral carbon atom. Chiral carbon centers are also called asymmetric or stereogenic centers. A carbon atom that does not have four nonequivalent atoms or groups attached to it is known as an achiral carbon atom.

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(B) Draw two chair conformations of the following substituted cyclohexane and identify the most stable conformation. Clearly show the axial and equatorial bonds.

Consider 1-bromopropane, CH3CH2CH2Br. (a) Draw a Newman projection for the conformation in which CH3 and -Br are anti (dihedral angle 180°). (b) Draw Newman projections for the conformations in which - CH3 and -Br are gauche (dihedral angles 60° and 300°). (c) Which of these is the lowest energy conformation? (d) Which of these conformations, if any, are related by reflection?

1.Draw both cis- and trans-1,4-dimethylcyclohexane in their conformations. (a) How many stereoisomérs are there of cis-1,4-dimethylcyclohexane, and how many of rans-1,4-dimethylcyclohexane? (b) Are of the structures chiral? (c) What are the stereochemicar relationships among the various stereoisomers of 1,4-dimethylcyclohexane?

Answer 2

Question

Chapter 6, Problem 6.38AP

Interpretation Introduction

(a)

Interpretation:

The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1−C2 bond.

Concept introduction:

The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

Interpretation Introduction

(b)

Interpretation:

The chirality of each conformation of ephedrine is to be examined. The way in which chiralities of the conformation of ephedrine are related to the overall chirality of ephedrine is to be stated.

Concept introduction:

A carbon atom that has four nonequivalent atoms or groups attached to it is known as the chiral carbon atom. Chiral carbon centers are also called asymmetric or stereogenic centers. A carbon atom that does not have four nonequivalent atoms or groups attached to it is known as an achiral carbon atom.

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Answer 3

Question

Chapter 6, Problem 6.38AP

Interpretation Introduction

(a)

Interpretation:

The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1−C2 bond.

Concept introduction:

The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

Interpretation Introduction

(b)

Interpretation:

The chirality of each conformation of ephedrine is to be examined. The way in which chiralities of the conformation of ephedrine are related to the overall chirality of ephedrine is to be stated.

Concept introduction:

A carbon atom that has four nonequivalent atoms or groups attached to it is known as the chiral carbon atom. Chiral carbon centers are also called asymmetric or stereogenic centers. A carbon atom that does not have four nonequivalent atoms or groups attached to it is known as an achiral carbon atom.

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Answer 4

Question

Chapter 6, Problem 6.38AP

Interpretation Introduction

(a)

Interpretation:

The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1−C2 bond.

Concept introduction:

The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

Interpretation Introduction

(b)

Interpretation:

The chirality of each conformation of ephedrine is to be examined. The way in which chiralities of the conformation of ephedrine are related to the overall chirality of ephedrine is to be stated.

Concept introduction:

A carbon atom that has four nonequivalent atoms or groups attached to it is known as the chiral carbon atom. Chiral carbon centers are also called asymmetric or stereogenic centers. A carbon atom that does not have four nonequivalent atoms or groups attached to it is known as an achiral carbon atom.

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Answer 5

Chapter 6, Problem 6.38AP

Interpretation Introduction

(a)

Interpretation:

The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1−C2 bond.

Concept introduction:

The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

Interpretation Introduction

(b)

Interpretation:

The chirality of each conformation of ephedrine is to be examined. The way in which chiralities of the conformation of ephedrine are related to the overall chirality of ephedrine is to be stated.

Concept introduction:

A carbon atom that has four nonequivalent atoms or groups attached to it is known as the chiral carbon atom. Chiral carbon centers are also called asymmetric or stereogenic centers. A carbon atom that does not have four nonequivalent atoms or groups attached to it is known as an achiral carbon atom.

Answer 6

Chapter 6, Problem 6.38AP

Interpretation Introduction

(a)

Interpretation:

The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1−C2 bond.

Concept introduction:

The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

Answer 7

Chapter 6, Problem 6.38AP

Interpretation Introduction

(a)

Interpretation:

The sawhorse projections of all three staggered and all three eclipsed conformations of ephedrine are to be drawn by the rotation about the C1−C2 bond.

Concept introduction:

The sawhorse representation is used to show the above carbon atom on right side in a molecule. The staggered from forms when all-atom is away from each other. The eclipsed form forms when all two atoms come in front of each other. The potential energy of the eclipsed form is higher than that of staggered form.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The chirality of each conformation of ephedrine is to be examined. The way in which chiralities of the conformation of ephedrine are related to the overall chirality of ephedrine is to be stated.

Concept introduction:

A carbon atom that has four nonequivalent atoms or groups attached to it is known as the chiral carbon atom. Chiral carbon centers are also called asymmetric or stereogenic centers. A carbon atom that does not have four nonequivalent atoms or groups attached to it is known as an achiral carbon atom.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The chirality of each conformation of ephedrine is to be examined. The way in which chiralities of the conformation of ephedrine are related to the overall chirality of ephedrine is to be stated.

Concept introduction:

A carbon atom that has four nonequivalent atoms or groups attached to it is known as the chiral carbon atom. Chiral carbon centers are also called asymmetric or stereogenic centers. A carbon atom that does not have four nonequivalent atoms or groups attached to it is known as an achiral carbon atom.

Answer 10

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Answer 12

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Answer 13

Ch. 6 - Prob. 6.1P Ch. 6 - Prob. 6.2P Ch. 6 - Prob. 6.3P Ch. 6 - Prob. 6.4P Ch. 6 - Prob. 6.5P Ch. 6 - Prob. 6.6P Ch. 6 - Prob. 6.7P Ch. 6 - Prob. 6.8P Ch. 6 - Prob. 6.9P Ch. 6 - Prob. 6.10P

Solution Summary: The author explains that the sawhorse representation is used to show the above carbon atom on right side in a molecule.

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