The two possible chair conformations of either α or β anomer of D-idose are to be drawn. The reason corresponding to the fact that the more stable conformation has the CH 2 OH group in the axial position is to be stated. Concept introduction: An idose is a monosaccharide which contains six carbon atoms and an aldehyde group. The molecular formula of arabinose is C 6 H 12 O 6 . The anomers are cyclic monosaccharides which are differ in configuration at C 1 in aldoses and at C 2 in ketoses. These carbon atoms are called anomeric centre. The anomeric centre is labeled by α or β .

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 28, Problem 28.48P

Interpretation Introduction

Interpretation: The two possible chair conformations of either α or β anomer of D-idose are to be drawn. The reason corresponding to the fact that the more stable conformation has the CH2OH group in the axial position is to be stated.

Concept introduction: An idose is a monosaccharide which contains six carbon atoms and an aldehyde group. The molecular formula of arabinose is C6H12O6. The anomers are cyclic monosaccharides which are differ in configuration at C1 in aldoses and at C2 in ketoses. These carbon atoms are called anomeric centre. The anomeric centre is labeled by α or β.

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The most stable conformation of the pyranose ring of most D-aldohexoses places the largest group, CH2OH, in the equatorial position. An exception to this is the aldohexose D-idose. Draw the two possible chair conformations of either the a or ß anomer of D-idose. Explain why the more stable conformation has the CH2OH group in the axial position.

The most stable conformation of the pyranose ring of most D-aldohexoses places the largest group, CH2OH, in the equatorial position. An exception to this is the aldohexose D-idose. Draw the two possible chair conformations of either the α or β anomer of D-idose. Explain why the more stable conformation has the CH2OH group in the axial position.

Draw the isomers for each aldotetrose and ketopentose in the figure below and designate each isomer as a D or L sugar and designate also the R and S in every chiral centers. Label the enantiomers and diastereomers respectively. CH,OH C=0 Н—С—ОН Н-С—ОН Н—С—ОН H-C-OH ČH,OH ČH,OH

Answer 2

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 28, Problem 28.48P

Interpretation Introduction

Interpretation: The two possible chair conformations of either α or β anomer of D-idose are to be drawn. The reason corresponding to the fact that the more stable conformation has the CH2OH group in the axial position is to be stated.

Concept introduction: An idose is a monosaccharide which contains six carbon atoms and an aldehyde group. The molecular formula of arabinose is C6H12O6. The anomers are cyclic monosaccharides which are differ in configuration at C1 in aldoses and at C2 in ketoses. These carbon atoms are called anomeric centre. The anomeric centre is labeled by α or β.

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Answer 3

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 28, Problem 28.48P

Interpretation Introduction

Interpretation: The two possible chair conformations of either α or β anomer of D-idose are to be drawn. The reason corresponding to the fact that the more stable conformation has the CH2OH group in the axial position is to be stated.

Concept introduction: An idose is a monosaccharide which contains six carbon atoms and an aldehyde group. The molecular formula of arabinose is C6H12O6. The anomers are cyclic monosaccharides which are differ in configuration at C1 in aldoses and at C2 in ketoses. These carbon atoms are called anomeric centre. The anomeric centre is labeled by α or β.

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Answer 4

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Definition Definition Organic compounds that have a carbonyl group, C=O, as their functional group. The carbonyl group in aldehydes is placed at the end of the molecular structure, which means the C=O is attached to one hydrogen atom and an alkyl group or a benzene ring. Just like all the other homologous series in organic chemistry, the naming of aldehydes uses the suffix “-al”. The general molecular formula is C n H 2n O.

Chapter 28, Problem 28.48P

Interpretation Introduction