ORGANIC CHEM PRINT STUDY GDE & SSM
ORGANIC CHEM PRINT STUDY GDE & SSM
4th Edition
ISBN: 9781119810650
Author: Klein
Publisher: WILEY
Question
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Chapter 24.2, Problem 3CC

(a)

Interpretation Introduction

Interpretation:

For each of the given compounds, whether it is D or L sugar should be determined, the configuration of each chiral center should be assigned and the trend on the configuration of each chiral center should be explained.

Concept introduction:

  • The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).

    ORGANIC CHEM PRINT STUDY GDE & SSM, Chapter 24.2, Problem 3CC , additional homework tip  1

    The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon from the carbonyl group. Such as,

    If the –OH group is located in right side then, the carbohydrate is a D-sugar.

    If the –OH group is located in left side then, the carbohydrate is a L-sugar.

  • Chiral carbon: Chiral carbon is the one which is bonded to four different molecules or groups.
  • Configuration of a molecule: The configurations of a molecule arise due to the spatial arrangement of atoms. The configuration can be assigned by following CIP rules as follows.
  • Assign numbering to the groups which are bonded to the chiral carbon based on the molecular weight and electronegativity.
  • If the sequence of the numbering follows clockwise direction the chiral atom is assigned as R configuration.
  • If the sequence of the numbering follows anticlockwise direction the chiral atom is assigned as S configuration.
  • If the least priority group is on horizontal line in the fisher projection, then configuration is inverted to the obtained configuration from the above CIP rule which means R configuration becomes S and vice versa.
  • The D-configuration is needed not to be dextrorotatory; rather it means the chirality center of farthest from aldo-group is having R-configuration or the –OH group is on right side.

To identify: the given carbohydrate (a) is D or L sugar and the configuration of each chiral center.

(b)

Interpretation Introduction

Interpretation:

For each of the given compounds, whether it is D or L sugar should be determined, the configuration of each chiral center should be assigned and the trend on the configuration of each chiral center should be explained.

Concept introduction:

  • The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).

    ORGANIC CHEM PRINT STUDY GDE & SSM, Chapter 24.2, Problem 3CC , additional homework tip  2

    The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon from the carbonyl group. Such as,

    If the –OH group is located in right side then, the carbohydrate is a D-sugar.

    If the –OH group is located in left side then, the carbohydrate is a L-sugar.

  • Chiral carbon: Chiral carbon is the one which is bonded to four different molecules or groups.
  • Configuration of a molecule: The configurations of a molecule arise due to the spatial arrangement of atoms. The configuration can be assigned by following CIP rules as follows.
  • Assign numbering to the groups which are bonded to the chiral carbon based on the molecular weight and electronegativity.
  • If the sequence of the numbering follows clockwise direction the chiral atom is assigned as R configuration.
  • If the sequence of the numbering follows anticlockwise direction the chiral atom is assigned as S configuration.
  • If the least priority group is on horizontal line in the fisher projection, then configuration is inverted to the obtained configuration from the above CIP rule which means R configuration becomes S and vice versa.
  • The D-configuration is needed not to be dextrorotatory; rather it means the chirality center of farthest from aldo-group is having R-configuration or the –OH group is on right side.

To identify: the given carbohydrate (b) is D or L sugar and the configuration of each chiral center.

(c)

Interpretation Introduction

Interpretation:

For each of the given compounds, whether it is D or L sugar should be determined, the configuration of each chiral center should be assigned and the trend on the configuration of each chiral center should be explained.

Concept introduction:

  • The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).

    ORGANIC CHEM PRINT STUDY GDE & SSM, Chapter 24.2, Problem 3CC , additional homework tip  3

    The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon from the carbonyl group. Such as,

    If the –OH group is located in right side then, the carbohydrate is a D-sugar.

    If the –OH group is located in left side then, the carbohydrate is a L-sugar.

  • Chiral carbon: Chiral carbon is the one which is bonded to four different molecules or groups.
  • Configuration of a molecule: The configurations of a molecule arise due to the spatial arrangement of atoms. The configuration can be assigned by following CIP rules as follows.
  • Assign numbering to the groups which are bonded to the chiral carbon based on the molecular weight and electronegativity.
  • If the sequence of the numbering follows clockwise direction the chiral atom is assigned as R configuration.
  • If the sequence of the numbering follows anticlockwise direction the chiral atom is assigned as S configuration.
  • If the least priority group is on horizontal line in the fisher projection, then configuration is inverted to the obtained configuration from the above CIP rule which means R configuration becomes S and vice versa.
  • The D-configuration is needed not to be dextrorotatory; rather it means the chirality center of farthest from aldo-group is having R-configuration or the –OH group is on right side.

To identify: the given carbohydrate (c) is D or L sugar and the configuration of each chiral center.

(d)

Interpretation Introduction

Interpretation:

For each of the given compounds, whether it is D or L sugar should be determined, the configuration of each chiral center should be assigned and the trend on the configuration of each chiral center should be explained.

Concept introduction:

  • The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).

    ORGANIC CHEM PRINT STUDY GDE & SSM, Chapter 24.2, Problem 3CC , additional homework tip  4

    The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon from the carbonyl group. Such as,

    If the –OH group is located in right side then, the carbohydrate is a D-sugar.

    If the –OH group is located in left side then, the carbohydrate is a L-sugar.

  • Chiral carbon: Chiral carbon is the one which is bonded to four different molecules or groups.
  • Configuration of a molecule: The configurations of a molecule arise due to the spatial arrangement of atoms. The configuration can be assigned by following CIP rules as follows.
  • Assign numbering to the groups which are bonded to the chiral carbon based on the molecular weight and electronegativity.
  • If the sequence of the numbering follows clockwise direction the chiral atom is assigned as R configuration.
  • If the sequence of the numbering follows anticlockwise direction the chiral atom is assigned as S configuration.
  • If the least priority group is on horizontal line in the fisher projection, then configuration is inverted to the obtained configuration from the above CIP rule which means R configuration becomes S and vice versa.
  • The D-configuration is needed not to be dextrorotatory; rather it means the chirality center of farthest from aldo-group is having R-configuration or the –OH group is on right side.

To identify: the given carbohydrate (d) is D or L sugar and the configuration of each chiral center.

(e)

Interpretation Introduction

Interpretation:

For each of the given compounds, whether it is D or L sugar should be determined, the configuration of each chiral center should be assigned and the trend on the configuration of each chiral center should be explained.

Concept introduction:

  • The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).

    ORGANIC CHEM PRINT STUDY GDE & SSM, Chapter 24.2, Problem 3CC , additional homework tip  5

    The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon from the carbonyl group. Such as,

    If the –OH group is located in right side then, the carbohydrate is a D-sugar.

    If the –OH group is located in left side then, the carbohydrate is a L-sugar.

  • Chiral carbon: Chiral carbon is the one which is bonded to four different molecules or groups.
  • Configuration of a molecule: The configurations of a molecule arise due to the spatial arrangement of atoms. The configuration can be assigned by following CIP rules as follows.
  • Assign numbering to the groups which are bonded to the chiral carbon based on the molecular weight and electronegativity.
  • If the sequence of the numbering follows clockwise direction the chiral atom is assigned as R configuration.
  • If the sequence of the numbering follows anticlockwise direction the chiral atom is assigned as S configuration.
  • If the least priority group is on horizontal line in the fisher projection, then configuration is inverted to the obtained configuration from the above CIP rule which means R configuration becomes S and vice versa.
  • The D-configuration is needed not to be dextrorotatory; rather it means the chirality center of farthest from aldo-group is having R-configuration or the –OH group is on right side.

To identify: the given carbohydrate (e) is D or L sugar and the configuration of each chiral center.

 (f)

Interpretation Introduction

Interpretation:

For each of the given compounds, whether it is D or L sugar should be determined, the configuration of each chiral center should be assigned and the trend on the configuration of each chiral center should be explained.

Concept introduction:

  • The stereo-descriptor used for carbohydrates is D or L. it is based on the dextrorotatory or levorotatory of smallest carbohydrate glyceraldehyde (1 chiral center).

    ORGANIC CHEM PRINT STUDY GDE & SSM, Chapter 24.2, Problem 3CC , additional homework tip  6

    The stereo-descriptor for other carbohydrates of having more than one chiral center will be evaluated by the location of –OH group (right or left) of farthest chiral carbon from the carbonyl group. Such as,

    If the –OH group is located in right side then, the carbohydrate is a D-sugar.

    If the –OH group is located in left side then, the carbohydrate is a L-sugar.

  • Chiral carbon: Chiral carbon is the one which is bonded to four different molecules or groups.
  • Configuration of a molecule: The configurations of a molecule arise due to the spatial arrangement of atoms. The configuration can be assigned by following CIP rules as follows.
  • Assign numbering to the groups which are bonded to the chiral carbon based on the molecular weight and electronegativity.
  • If the sequence of the numbering follows clockwise direction the chiral atom is assigned as R configuration.
  • If the sequence of the numbering follows anticlockwise direction the chiral atom is assigned as S configuration.
  • If the least priority group is on horizontal line in the fisher projection, then configuration is inverted to the obtained configuration from the above CIP rule which means R configuration becomes S and vice versa.
  • The D-configuration is needed not to be dextrorotatory; rather it means the chirality center of farthest from aldo-group is having R-configuration or the –OH group is on right side.

To explain: the trend on the configuration of each chiral center in each given carbohydrates.

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Chapter 24 Solutions

ORGANIC CHEM PRINT STUDY GDE & SSM

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