Place an asterisk by each stereocenter in the molecules depicted below. Note that if this were an exam you would lose points for placing an asterisk by non-stereocenters. Also label each molecule as chiral or achiral. Then identify the isomeric relationships between I and II, I and III, and II and III (identical, enantiomers, diastereomers, constitutional) HO OH II III
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- 3. Assign R or S configuration to the chirality centers of the following molecules; Cl CH3 CH3 а) b) HO C СООН СООН H;C H CH,CH3 H Br ОН CH,CH3 VIl. H ОН e) f) d) Cl H H OCH3 Br H. Br ...|| h) СООН HOCH, H3C CH33. Are the following molecules chiral or achiral? What features lead you to this conclusion? Identify the chiral centers in each molecule and assign an R or S stereochemical configuration to each. CI H3C, Br H3C H. CIUse the Cahn-Ingold-Prelog rules to establish the priorities of the different groups bonded to the C(2) stereogenic centre in the following compound (to show your working, use a diagram similar to the one illustrated)and then determine the absolute configuration at the C(2) stereogenic centre. [ ] [ ] HO OH F CO₂H ] с C(2) [ C <<- atom -atomic number ]
- Assign R and S configurations to the chirality centres of the compounds below: O₂N ... OH ||||| 15 IC/ CI CH₂OH NHCOCHCI₂ HO₂C NH₂ H H H3C HO CH3Assign R or S configuration to the chirality center (where applicable) in each of the following structures. Which of the following structure is/are achiral? e) 1.0 HO, H OH H OH H он но II IV f) How many stereoisomers are possible for 3, 4 dibromo hexane? Show the structures of them in Wedge formula and assign R or S configuration to the chirality centers. And also comment on their optical activity. 1.0Assign the absolute configuration to each chirality center in the following molecules. indicate E/Z stereochemistry where possible. HOOC a) HN Br но b) CN H2N c) он
- (k) (1) OH SOCI₂ 1) BH 3 THF 2) H₂O2, NaOH Rationalize the stereochemical outcomes for A and B CH3 A ...OH B TSCI pyridine LICI8. Identify the stereochemical relationship between the structural pairs shown below as (A) identical structures that are not meso; (B) identical structures that ARE meso; (C) structures that are enantiomers; or (D) structures that are diastereomers. a) b) H3C c) CH3 Br H. CH3 Br Br CH3 H. CI Holl H Cill Cl- CH3 Br H. CI CH3 HO. H. H3C Cl H3C- H- H. CH3 Cl a) b) c) 9. Identify the stereochemical relationship between the structural pairs shown below as (A) identical structures that are not meso; (B) identical structures that ARE meso; (C) structures that are enantiomers; or (D) structures that are diastereomers. a) b) c) CH2CH3 NH2 HO CH3 H3C. CH3 Cl HO H;C CH2CH3 F. F H;C. CI H H,N -CH3 CH3 NH2 H3C Br H2N C1 H3C CH3 CH3 H;CH,C- Cl F H. H Br CH,CH3 CH3 a) b) c)4. Assign R,S configurations to the following molecules: (a) Br (b) H (c) NH2 H3C-CO2H HOC-CO2H CH3 NCC-CH3 H. H 5. Assign R or S configuration to each chirality center in the following molecules: (a) CH3 Br H Br (b) CH3 Br (c) H CH3 Ha H3C H OH OH H OH H "CH3 CH3 Which of these compounds are enantiomers, and which are diastereomers?
- Describe the relationship of the following pairs of molecules as identical, enantiomers, diastereomers, or constitutional isomers. Br Ме, Н Me CI Me i. CI Br H Me H CI, Et Me CI Et Et. ii. Me Et Me CI Mee CI iii. none of the other answer choices are correct O i. = diastereomers; ii. = identical; iii. = enantiomers i. = diastereomers; ii. = constitutional isomers; iii. = diastereomers i. = enantiomers; ii. = constitutional isomers; iii. = diastereomers O i. = enantiomers; i. = identical; iii. = diastereomersE draw stcueture as i - NO Fischee pruje ctions. 7. For the following structure: エ (a) Assign R/S configuration to all chiral centers (show all work). (b) draw an enantiomer and diastereomer of the above structure, and assign configuration at all chiral centers (again, show all work). (c) on the basis of the R/S system, justify your designation of the structures as enantiomeric or diastereomeric.2. For each of the following molecules determine which are chiral and which are achiral, and write the approprae word in the box provided Then for pach that is chiral draw the mimoe imane and determine RIS configuradon every stereogenic center within the mirror image you drew (a) Chiral or achiral? OH CH (b) (c) NH, HN. CH3