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- 2. Assign the R or S configuration to each chiral center in the molecules below. CH3 fo OH CH₂CH₂Br (H3C)3C. HO CO₂H H₂C=C- C=CH -CH(CH₂CH3)2 C(CH3)3 HO CH₂CH₂Br CH₂CH₂CH3 FCH₂Br 3 (numbers indicate the IUPAC numbering)Consider CH3-CH(OH)-CH(OH)(Br). a.How many stereogeniccenters are in the molecule? b.How many stereoisomers are there for the compound? c.Draw the Fischer projection for each of the stereoisomer. Label each using I, II, etc. d.Which pairs are enantiomers? Which are diastereomers? e.Determine the absolute configuration of each chiral center in one pair of diastereomer.HN- H3C HN -NH "CH3 OH H. CH3 H,C. Br H3C CH3 CH3 HO. Br HO,
- 1a. How many stereogenic centers are present 1c. Draw a three-dimensional structure of a in the structure below? Indicate them with asterisk(s). How many stereoisomers stereoisomers are possible? chiral compound with the molecular formula of C4H4Cl₂ that does not have a stereogenic carbon. In addition, draw the enantiomer of this compound. Number of stereogenic centers: Number of stereoisomers possible: 1b. Draw one of the two most stable stereoisomers of the compound in 1a using a planar structure with wedges and dashes. Now draw it in its preferred chair conformation. 1d. Draw two meso compounds with the molecular formula of C7H14.2. Draw the optical isomers of CH3-CHOH-CHOH-CH3 . INDICATE the absolute configuration of each chiral center. Which are enantiomers? Which are diastereomers? Is there any meso compound present? Identify if yes.5. Draw the structure of (S)-1-bromo-1-chloropropane. Take care to indicate the three- dimensional stereochemistry properly. 6. How many chiral centers does the following compound contain? CH3 7. Label each chiral carbon in the molecule below as having R or S configuration. HO₂C H F. H3C H CH₂CH3
- • Question 5: Label each stereogenic center as R or S. CH₂ a. CH₂CH₂ b. CH H 1 NH₂ H CH3 CH₂CH₂ T C. D CI CH3 d. Br C ICH₂ H e. f. H* HO C HOOC CH₂ HO CH(CH3)2 -C₂ C CH3 SH NH₂ H CH3 g. h. .CI CI1. In the structure provided choose the option YES or NO to indicate if the carbon atoms are chiral. H 2. Assign the absolute configuration of the asymmetric/chiral centers in the provided structures a, b and c. a. a. C-H HO-CH3 H b. NH₂ 3. For the following two structures compared in parts A and B, determine whether they are enantiomers OR diastereomers OR the same structure drawn differently (non-bonding electrons not included for clarity). d. Br Br OH door OH Br b. CH3 HC OH H-C O Br $R= C. OH Br Br OH Br 11. Label the chiral and achiral carbons in the following molecules. H₂C CH3 OH H. CH3 CH3 -CH3 H₂C Br CH3 Br
- Consider the Newman projections, A-C. CHO Н. H CHO OH A CH₂OH OH но. н H ОН CH₂OH B н. НО CHO OH C .CH₂OH н i. Determine the structural relationship of A and B; B and C. ii. Without a change in conformation, assign the configuration to the chiral centers in B.Shown below is Streptomycin, an antibiotic medication used to treat a number of bacterial infections, including tuberculosis, plague, and endocarditis. Neomycin B has broad-spectrum antibacterial activity. Circle and label as many functional groups in these molecules as you can. Label each chiral carbon in Streptomycin. How many total stereoisomers exist for Streptomycin? Label each chiral carbon in Neomycin B. How many total stereoisomers exist for Neomycin B?1. Identify each molecule as Chiral or Achiral and write the number of Asymmetric carbons present in each chiral molecules. J) 4-Ethyl-2,4-dimethylhexane N) 1- Chlorobutane 0) CH2 = CH CH CH3 CH3 CH3 CH3 L) H3C. CH3