(a) Interpretation: The R , S system configuration for α - carbon of L- cysteine is to be stated. Concept introduction: The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

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Answer 1

Question

Chapter 27, Problem 27.6P

Interpretation Introduction

(a)

Interpretation:

The R, S system configuration for α- carbon of L- cysteine is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Interpretation Introduction

(b)

Interpretation:

The reason for the fact that L- cysteine and L- serine has different configurations in the R, S system is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

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Assign an R or S configuration to the chiral center in each amino acid. (a) l-Phenylalanine (b) l-Glutamic acid (c) l-Methionine

h) Specify the absolute (R/S) configuration of the amino group in structure IV. (i) If the substituents in structures I, IV and V were identical (all OH or all NH2), which structure would result in a meso compound? (j) If each hydroxy group for structures I, II and VI were replaced with another amino group, which compound would be made optically inactive?

10. Enumerate the PUFA (Polyunsaturated Fatty Acids) and indicate the position of unsaturation? 11. Enumerate the derivatives of steroids and their functions. 12. Compare and contrast the functions lipoproteins. 13. Circle the fatty acid in each pair that has the higher melting temperature. (a) 18:1Δ9 18:2 Δ 9,12 (b) 18:0 18:1 Δ 9 (c) 18:0 16:0 14. Describe the dependence of the melting point of a fatty acid upon (a) chain length and (b) unsaturation; (c) explain these dependencies in molecular terms.

Answer 2

Question

Chapter 27, Problem 27.6P

Interpretation Introduction

(a)

Interpretation:

The R, S system configuration for α- carbon of L- cysteine is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Interpretation Introduction

(b)

Interpretation:

The reason for the fact that L- cysteine and L- serine has different configurations in the R, S system is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

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Answer 3

Question

Chapter 27, Problem 27.6P

Interpretation Introduction

(a)

Interpretation:

The R, S system configuration for α- carbon of L- cysteine is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Interpretation Introduction

(b)

Interpretation:

The reason for the fact that L- cysteine and L- serine has different configurations in the R, S system is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

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Answer 4

Question

Chapter 27, Problem 27.6P

Interpretation Introduction

(a)

Interpretation:

The R, S system configuration for α- carbon of L- cysteine is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Interpretation Introduction

(b)

Interpretation:

The reason for the fact that L- cysteine and L- serine has different configurations in the R, S system is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

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Answer 5

Chapter 27, Problem 27.6P

Interpretation Introduction

(a)

Interpretation:

The R, S system configuration for α- carbon of L- cysteine is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Interpretation Introduction

(b)

Interpretation:

The reason for the fact that L- cysteine and L- serine has different configurations in the R, S system is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Answer 6

Chapter 27, Problem 27.6P

Interpretation Introduction

(a)

Interpretation:

The R, S system configuration for α- carbon of L- cysteine is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Answer 7

Chapter 27, Problem 27.6P

Interpretation Introduction

(a)

Interpretation:

The R, S system configuration for α- carbon of L- cysteine is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Answer 8

Interpretation Introduction

(b)

Interpretation:

The reason for the fact that L- cysteine and L- serine has different configurations in the R, S system is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Answer 9

Interpretation Introduction

(b)

Interpretation:

The reason for the fact that L- cysteine and L- serine has different configurations in the R, S system is to be stated.

Concept introduction:

The naming of the chiral center and geometric isomers are based on Cahn-Ingold-Prelog priority rules. If the priority assigned to each group attached to the chiral center in a molecule is in a clockwise direction, then it is the R-stereoisomer, and if this is counter-clockwise, then it is the S-stereoisomer. R and S-stereoisomer are mirror images of each other. The line-and-wedge representation is used to show the molecule in three dimensions.

Answer 10

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Answer 13

Ch. 27 - Prob. 27.1P Ch. 27 - Prob. 27.2P Ch. 27 - Prob. 27.3P Ch. 27 - Prob. 27.4P Ch. 27 - Prob. 27.5P Ch. 27 - Prob. 27.6P Ch. 27 - Prob. 27.8P Ch. 27 - Prob. 27.9P Ch. 27 - Prob. 27.10P Ch. 27 - Prob. 27.11P

Solution Summary: The author explains the R, S system configuration for alpha- cysteine, based on Cahn-Ingold-Prelog priority rules.

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