Thalidomide exists in two enantiomeric isomers as shown below. ((R) N۰۰۰ ((S) If a solution is prepared by adding a 50:50 ratio of two enantiomers what will be the expected observed rotation? Explain your answer in 1-2 sentences.
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Given that thalidomide exists in two enantiomeric isomers as shown below
A solution is prepared by mixing 50:50 ratio of two enantiomers.
The expected observed rotation is
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- The specific rotation, [a]p, for (-)-2-butanol is +14. What is the observed rotation for a solution of 2.5 g of (-)-2-butanol in 10 mL of water in a sample tube having a pathlength of 10 cm? degrees. The observed rotation of a solution of 0.75 g of a compound in 10 mL of water is -4.6 degrees. If the pathlength is 10 cm, what is the specific rotation of the compound?How many stereocenters are present in diosgenin (structure below)? Me HO Me H I Me H Me I..(9) How many chiral centers are present in a molecule of 1,3-dimethylcyclohexane? (C) 2 (D) 3 1 (A) O (10) What is the percent composition of a mixture of (S)-(+)-2-butanol, [a] = +13.52°, and (R)-(-)-2-butanol, [a] = -13.52°, with a specific rotation [a]D = -6.76° (A) 75%R 25%S (B) 25%R 75%S (C) 50%R 50%S 67%R 33%S
- Note: enantiomers have similar physical properties (mp, density, solubility), and same [a], but with different signs ( - or +). Practice: 1.2 gm sample of cocaine, [a], = -16º, was dissolved in 7.5 mL of chloroform and placed in a sample tube having a pathlength of 5 cm. what was the observed rotation in degrees?5. Consider the following pairs of structures. Identify the relationship between them (enantiomers, diastereomers, or identical compounds. HOH2C H OH H OH HO H Br H3C Н H H₂CH₂C CI Br H CHO CH3 I CH3 OH OHC Н H OH H OH Bell!! H3C, HO H Н.С H CH₂CH3 CH3 CI HỌ,H CH₂OH BrFor the following molecules, draw all possible stereoisomers using line-angle formulas with wedge/dash notation. Label the stereocenters as R or S. Indicate which ones are enantiomers and which ones are diastereomers. (Remember: there are 2 stereoisomers possible for a molecule with n chiral centers) (A) (B) (C) (1 chiral center) Br OH (2 chiral centers) CI OH CH3 (3 chiral centers)
- 10 Label the stereocenters present in the molecules below as either Ror S. (a) Cl (b) Cl (c) Cl (d) Cl (e) Cl (f)Draw all the possible stereoisomerism for following structures. Label the chiral centrewith an asterisk (*) if any.(a) CH(COOH)(NH2)CH2COOH(b) (CH3)2C=C(COOH)CH(NO2)CH3 PLEASE PROVIDE CLEAR DRAWING AND SOLUTIONSWhich of the following statements is/are true about the mirror-image stereoisomer of the molecule, shown below? OH OH HO i) The mirror-image stereoisomer of the compound shown has identical biological activity. ii) The mirror-image stereoisomer of the compound shown has the same melting point. iii) The mirror-image stereoisomer of the compound shown rotates plane-polarized light by the same amount but in the opposite direction. O only ii and iii are true O all of the statements are true O only i and iii are true O none of the statements are true O only i and ii are true
- 8. Two structures of Lipitor (a drug used to lower cholesterol) are shown below. (a) Determine the absolute configuration of each indicated stereocenter. Fill in the correct circle. (b) Determine if the two structures are the same compound or stereoisomers. Fill in the correct circle. (a) НО. Carbon a HO O OH Carbon a: OR OS Carbon b H N Carbon b: R OS of H Carbon c: OR OS OH OH Carbon c F Carbon d: R OS OH Carbon d (b) The two structures are: O the same compound O stereoisomersDraw and name the seven aldehydes and ketones with the formula C5H10O. Which are chiral?Each H↔H eclipsing interaction in ethane costs about 4.0 kJ/mol. How many such interactions are percent in cyclopropane? What fraction of the overall 115 kJ/mol (27.5 kcal/mol) strain energy of cyclopropane is due to torsional strain.