(a)
Interpretation: The enantiomer of D-arabinose is to be drawn.
Concept introduction: An arabinose is a monosaccharide which contains five carbon atoms and an
(b)
Interpretation: An epimer of D-arabinose at
Concept introduction: An arabinose is a monosaccharide which contains five carbon atoms and an aldehyde group. The molecular formula of arabinose is
(c)
Interpretation: The diastereomer that is not an epimer of D-arabinose is to be drawn.
Concept introduction: An arabinose is a monosaccharide which contains five carbon atoms and an aldehyde group. The molecular formula of arabinose is
(d)
Interpretation: The constitutional isomer of D-arabinose contains a carbonyl group is to be drawn.
Concept introduction: An arabinose is a monosaccharide which contains five carbon atoms and an aldehyde group. The molecular formula of arabinose is
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ORGANIC CHEMISTRY BOOK& SG/SM
- a. How many stereogenic centers are present in α-D-galactose? b. Label the hemiacetal carbon in α-D-galactose. c. Draw the structure of β-D-galactose. d. Draw the structure of the polyhydroxy aldehyde that cyclizes to α- and β-D-galactose.arrow_forwardHow is each compound related to the simple sugar D-erythrose? Is it an enantiomer, a diastereomer, or an identical molecule?arrow_forwardCH2OH A. Circle the anomeric sugar on the left OH B. Circle the carbon that makes the H. H. given sugar D-configuration? H. C. Is this possibly a natural sugar? OH D. Is this a or B sugar? H. OHarrow_forward
- Threonine is a naturally occurring amino acid that has two stereogenic centers.a. Draw the four possible stereoisomers using wedges and dashed wedges.b. The naturally occurring amino acid has the 2S,3R configuration at its two stereogenic centers. Which structure does this correspond to?arrow_forwardBe sure to answer all parts. [1] classify the compound as a D or L monosaccharide; [2] draw the the enantiomer of the compound. H. но- H. -OH но- -H ČH,OH [1] (select) (select) L Darrow_forward6. The Fischer projection for fructose is shown below. Is it a D-sugar or an L-sugar? a. It is a D-sugar because the hydroxyl at carbon A is to the right. b. It is a D-sugar because the carbonyl at carbon B is to the right. c. It is a D-sugar because the hydroxyl at carbon C is to the right d. It is an L-sugar because the carbonyl at carbon B is to the right. e. It is an L-sugar because the hydroxyl at carbon C is to the right. ACH2OH BFO H OH H OH H-OH CH2OH 7. Which of the following tynes of carbohydrates can be hydrelvzed to givo smaller molecules?arrow_forward
- Consider the tetrasaccharide stachyose drawn below. Stachyose is found in white jasmine,soybeans, and lentils. Because humans cannot digest it, its consumption causes flatulence. a. Is stachyose a reducing sugar?b. What product is formed when stachyose is treated with excess CH3I, Ag2O?c. What products are formed when the product in (e) is treated with H3O+?arrow_forwardKk.305.arrow_forwardConvert each cyclic monosaccharide into its acyclic form. CH,OH он, H. OH OH но O. OH HOCH, OH а. с. но- OH CH2OH он OH ОН OH OH CH2OH b. OH d. HO f. Но H. OH OH Но Но Но Он OHarrow_forward
- Draw a diastereomers of D- Glucosearrow_forwardConsider alanine a. How many chiral centers? b. How many stereoisomers? c. Draw the fischer projection for each stereoisomer and determine the absolute configuration for each chiral center.arrow_forwardDraw Fischer projection of the mirror image (enantiomer) D-robose c. Are these molecules superimposable? d. What type of isomerism is represented by these mirror images? e. Construct a model of a third isomer that is not a mirror image of the two above.arrow_forward
- Organic Chemistry: A Guided InquiryChemistryISBN:9780618974122Author:Andrei StraumanisPublisher:Cengage LearningIntroduction to General, Organic and BiochemistryChemistryISBN:9781285869759Author:Frederick A. Bettelheim, William H. Brown, Mary K. Campbell, Shawn O. Farrell, Omar TorresPublisher:Cengage Learning