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- 2. Assign the R or S configuration to each chiral center in the molecules below. CH2CH2B. CH3 .CO2H (H3C)3C. C=CH HO CH,F H,C=G+CH(CH,CH3)2 CH2CH,CH3 HO H C(CH3)3 ОН CH,CH,Br F"CH2Br 3 4 (numbers indicate the IUPAC numbering)4. Assign R and S nomenclature to the chiral carbon atoms CI H. OCH3 а. с. b. HOH2C" `COOH CISight along the C2-Cl bond of 2-methylpropane (isobutane). a. Draw a Newman projection of the most stable conformation. b. Draw a Newman projection of the least stable conformation. c. Make a graph of energy versus angle of rotation around the C2-Cl bond. d. Assign relative values to the maxima and minima in your graph, given that an H↔H eclipsing interaction costs 0 kJ/mol and an H↔CH3 eclipsing interaction costs 6.0 kJ/mol.
- 5. Draw the following molecules in two difference configurations about the double bond. Name the molecules and be sure to include the appropriate configuration (trans or cis). If the structure cannot be drawn in two different configurations. explain why a. H2C=CH2 b. CH3CH=CHCH3 с. CI(CH3)С-СHCH3the stereo center in this molecule is ___. a. R b. S3: Draw bond-line structures (with wedges or dashes, where appropriate) of each of the following molecules. Be sure to draw the correct stereoisomer of any chiral molecules. a: H. H I I C: H. OH b: CH3 H S CH3 H Br CH3 CH3 CI CH3
- 4. Circle the structure that corresponds to the correct 5-membered ring. CH.OH HO-H 5-membered ring H-OH н-он CH₂OH бебет НО OH Но НО OH HO, HO OH "IOH OH HOW НО HO IOH COHA. Circle the following molecules that have the S configuration. CH,CH3 CH,CH3 H. H3C-- H. CH=CH2 CH(CH3)2 CH3 CH3CH, CH2 HO, 3 16.
- Assign cis-trans or E-Z-configuration for the following compounds. Write the name of each compound.1. How many chiral (stereocenters) centers are in the following molecules? Recall that a chiral center will have a carbon atom bonded to four different substituents. Please circle the chiral centers. Structure I HO... III. Br !!! СОН Structure II NH2Match the following molecules with their correct chiral configuration.