18. Which shows the chair conformation of the carbohydrate whose Fischer projection is shown below? H HO -H HO -H H OH H OH OH HO HO HO O Option 1 OH OH HO HO HO OH O Option 2 w OH HO OH HO- Am OH HO- OH OH OH O Option 3 OH O Option 4 w OH
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- The image shows Fischer projections for the structures of four isomers of a ketopentose. CH₂OH CH₂OH CH₂OH ПА пс C=O D HOEC H HOECH CH,OH A C=O H➡ COH но-с-н CH₂OH Which of the structures are stereoisomers of B? B Which of the structures are diastereomers of D? C=O HOI-C-H HOI-C-H CH₂OH с 000 ΤΑ B HO D CH₂OH O Which of the structures are enantiomers of C? H HI COH D CH₂OHWhich shows the chair conformation of B-D-glucopyranose (Fisher projection shown below)? CHO H-OH HO-H H- -ОН H- -ОН ČH2OH OH OH HO ÓH OH OH OH Но- OH Он HỌ HO- HO он Но OH OHThe Fischer projection for D-glyceraldehyde (R stereochemistry) is: CHO нон CH2OH Which compound has the same stereochemistry? A) HO 7) Using the sug B) B) b) c) H HỌ CHO CH₂OH CHO HCH₂OH OH H DTC) OH+CH₂OH CHO (from 6), who OH D) HCHO CH₂OH
- Which structure below shows the chair conformation of B-D-glucopyranose? The Fischer projection of this compound is shown in the box. Click on a letter A through D to answer. OH он сно В. но H- OH OH но- -H H- OH HFOH ČH2OH С. HO -OH OH ÓH OH OH он А. D. HO Но -OH OH ÓHOf the four structures shown here in Fischer projections, indicate the relationships between (a) and (b), and between (c) and (d)? CHO CHO нтон нотн CH₂OH (a) CH₂OH (b) ÇO₂H H-OH -OH -он но- HO- CO₂H (c) II HO-H ÇO₂H of A. Both pairs are enantiomers O B. Both pairs are identical C. (a) and (b) are enantiomers, (c) and (d) are identical D. (a) and (b) are identical, (c) and (d) are enantiomers II CO₂H (d)NH2 N CH2 CH2 The stereochemistry around this chiral carbon is: O cannot be determined. O Rand S OR OS
- tion 6 of 17 > The structures of four isomers of a ketopentose are shown. OH کر کو 3 E D C 80 OH H-C-H 0=C HOLC-H HOC CH H-C-H OH A Dc $ 4 D B D D A Which of the structures are diastereomers of A? R F A DOD F4 H-C-H V OH C=0 HICIOH Но..C.....H HOLC-H HOCH H-C-H OH Which of the structures are stereoisomers of C? % 5 B T G H-C-H Es C=0 B H-C-H OH 6 C FG Y H & 7 OH H-C-H N 0=C HOLC…H HICIOH H-C-H 99 U OH D J * 8 M Which of the structures are enantiomers of C? - Ов OD A DII FB ( - 0 9 K DD FO H O < ) -O L command J F10 P A. : c F11 { [ option + ? 11 I 1 Attempt 5 F12 } 1 delete. Draw the most stable chair conformation of D-mannose (The Fischer Projection is provided below, anomeric effect dominate in this case). CHO -H clyclization -H -OH -OH CH₂OH the most stable chair comformation HO HO H I IDetermine the absolute configuration of the following compounds anc draw the structure (Fischer projection) of the other enantiomer. F CH3 CN HO I`CH2NH2 H Br "CH3 CI H A В SH OH H3C" CH3 ČH2OH -C三CH ČH3 E HOOC D
- ents ncements IS Student urces C Syllabus mation CC Bookstore CC Library C-Tutoring mvas Support omputer Labs campus Tutoring ervices mportant Dates Student Help ny F2 C-2 Question 20 CH,OH H H OH Oanomers O enantiomers Classify the structures: O epimers O diasteriomers Question 21 H F3 O + OH OH F4 CH₂OH Search F5 H H OH OH F6 % [Choose ] H ОН F7 F8H3C CI C=C H2N I O (R)-enantiomer O (Z) isomer O (S)-enantiomer O (E) isomer O meso compoundPage 218 Draw all possible stereoisomers for each compound. Label pairs of enantiomers and diastereomers. Label any meso compound. 5.58 OH а. OH b. CI Br с. d.