Concept explainers
Interpretation:
The possible number of ketopentoses is to be determined, and their Fischer projections are to be drawn.
Concept introduction:
A ketopentose is a carbohydrate with a five carbon chain and a
Fischer projection is used to represent the stereochemistry in chiral molecules, particularly carbohydrates.
Fischer projection of a carbohydrate is drawn with the carbon chain vertical, and the lowest numbered carbon at the top. In case of aldoses, this means the
The non-terminal groups are shown on horizontal bonds.
The horizontal bonds in the projection are oriented toward the observer, and the vertical bonds oriented away from the observer.
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CAREY: ORGANIC CHEMISTRY
- Consider two disaccharides OH CH₂OH OH maltose OH CH OH OH - OH OH OH CH₂OH OH fructose OH OH CH OH Which of the two disaccharides contains a hemiacetal? Which of the two disaccharides contains the acetal? CHLOH OHarrow_forwardClassify each of the following sugars. (For example, glucose is an aldohexose.) CH2OH CH2OH C=0 Но H- HO- C=0 H- H- CH2OH HỌ H- но -H Но ČH;OH ČH2OH CH2OHarrow_forwardChoose all possible 2-ketohexoses that are D sugarsarrow_forward
- O aldopentose Question 3 Classify the following monosaccharide. C-H HO H- -HO- HO H- CH3 carboxylic acid heptose O alcohol pentose O ketohexose O deoxyhexose O aldohexose Question 4arrow_forwardClick the "draw structure" button to launch the drawing utility. Convert the cyclic form to an acyclic monosaccharide. CH₂OH O- H H OH HO H H OH draw structure 1b)Use a simple model to convert the following Fischer projection to a line structure showing stereochemistry Br OHC CH3 HO–|CH,CH3 H S d ww b Harrow_forwardO deoxy carboxylic acid pentose O carboxylic acid pentose O aldopentose Question 6 Classify the following monosaccharide. C-H H NH2 Но H -OH- ČH,OH O aminohexose O ketotetrose O deoxyhexose O aldohexose O carboxylic acid heptose Question 7 Classify the following monosaccharide. CH.OH MacBook Proarrow_forward
- Classify each monosaccharide according to the position of the carbonyl group and the number of carbon atoms in the molecule. CHO CH₂OH OH H -OH CH,OH aldotriose aldotetrose aldopentose ketotetrose ketotriose ketopentose galactose ketopentose aldotetrose ketotetrose ketohexose aldohexose aldopentose OH OH aldotetrose aldopentose ketohexose aldohexose ketopentose ketotetrosearrow_forwardThe structures of 4 isomers of ketopentose are shown. 1) which of the structures are diastereomers of structure A? C, B, or D 2) which of the structures are enantiomers of structure C? B, A, or D 3) which of the structures are stereoisomers of strcuture A?C, D, or Barrow_forward1. Which of the following is not true to the monosaccharide below? H. ОН но- -H- но ОН ĆH2OH O It is the Fischer Projection of D-glucose. It is an aldohexose having 4 chiral centers and 24 stereoisomers. It is has a D-glucose because OH- group bonded to the highest numbered chiral C is pointing to the right. It is a polyhydroxy ketone having 8 enantiomeric pair.arrow_forward
- 3. Determine the number of stereoisomers possible for a ketopentosearrow_forwardOH НО HO OH НО Но OH ОН ОН OH What are the monosachharides that make up this trisaccharide? O a-D-glucopyranose, a-D-galactopyranose, a-D-fructofuranose a-D-glucopyranose, a-D-galactopyranose, B-D-fructofuranose a-D-glucopyranose, a-D-glucopyranose, B-D-fructofuranose a-D-galactopyranose, a-D-glucopyranose, a -D-fructofuranosearrow_forwardFor the following disaccharide, identify acetal/ketal carbons and glycosidic linkage: ge НО Н�� ОН ОН Но ОН ОН ОНarrow_forward
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