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- 11. Consider the following compounds: ÇO,H CHO ОНС H. ОНС CO,H H3C- -- H. HO- H3C H. O, H ČOH HO, CH3 B (a) Label the asymmetric carbons as R or S on each compound (A - C). (b) Which compounds, if any, are enantiomers? diastereomers? identical?7) Identify the relationship between the following pairs of molecules [constitutional isomers, enantiomers, diastereomers, conformers, same molecule (non-meso), meso compound] a) c) C₂H5- H Br CI H CH3 Br H. CI Br H Br C₂H5 CH3 CI b) d) H. H Ph H F Me Br H H Et Br H F Et Me PhExplore! Determine the absolute configuration of the following compounds and draw the structure (Fischer projection) of the other enantiomer. CN CH3 HO CH2NH2 Br "CH3 A В SH ОН H3C CH3 CH2OH C=CH ČH3 E HOOC
- 7. Draw Fischer projections of two meso diastereomers of the following stereoisomer. CH3 CI -H CI H H -CI -H H- H- CI- CH3Determine 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 DGiven the following structure and numbering: H CO,H 3 H3C 1 A (a) Label the stereocenters of A as R or S and draw a Fischer Projection of the enantiomer of A with C1 on top and C4 on bottom. (b) Draw a Newman Projection of a diastereomer of 4 looking down the C2-C3 bond with C2 in front.
- 5. Assign R or S configuration to each chirality center in the following molecules: CH3 CH3 Br (a) Br (b) (c) HaCH3 HaBr H OH CH3 H3C H OH H CH3 OH Which of these compounds are enantiomers, and which are diastereomers?In the Fischer projection below, what are the configurations of the two asymmetric centers? CHs ČH-CH2OH HO 2R, 3S 2S, 3R 2S, 3S 2R, 3R cannot be determined from structure7. Draw a Fischer projection for each of the following molecules show in zigzag conformation. О OH H НО H3C OH OH НО ОН ОН ОН CN OH CI одна OH OH OH
- 2. Fill in the squares with the correct configuration (R or S) for the following compounds and determine whether they are Enantiomers, Diastereomers, the Same Compound or Constitutional Isomers. Br H₂N NH₂ "Br A) Enantiomers B) Diastereomers C) Same Compour D) Constitutional Isomers5) What is the relationship between each of the following pairs of molecules? Are the underlined answers correct? Explain. Br and Br (Identical Not Isomers Enantiomers Diastereomers I dentical the pos.tion of methul and Bromine becaure are at I and 3, Axial position. (b) Not Isomers Identical Enantiomers Diastereomers Br Br Br and Br (c) CHO CHO H OH HO--H COOH Not Isomers HO-H HO--H ČOOH Enantiomers Diastereomers Identical and (d) Br Enantiomers Diastereomers Not Isomers and Identical Bra. How many asymmetric centers does the following compound have? b. How many stereocenters does it have? CH3CH-ClCH CHCH3