Consider the following non-native form of the cyclic molecule, glucose: ОН но C3 - ОН Но C2 = R, C3 = R C2 = S, C3 =R R, C3 = S = ОН С2 Determine R or S for the stereocenters at carbons C2 and C3. C2 = 5, C3 = S С1
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- Q45: How many stereocentres are present in the molecule? Bri... H CI -CBr HButaclamol is a potent antipsychotic that has been used clinically in the treatment of schizophrenia. How many asymmetric centers does it have?which pair is (2R,3S) and (2S, 3R) and which pair is the (2S, 3S) and (2R, 3R)? please point to the stereocenters to answer Ph S Br LOH S Br A. Br Ph S R Br C. OH C 0 Ph R Br Br OH R B. Ph fo Br OH ི་ R Br S D. S
- Which of the following compounds has an asymmetric center? II III OIV OV CI H-CH3 CI II Br Br III -H 15 но- H CI IV TENEM -Br E EE 326 LEF V1. Determine the R/S configuration of all stereocenters in the following molecules: CH3 F а 'ОН H IF S IF H .... ОН ОН F I ОН H ОН F CI CH3When B-carotene is oxidised in vivo, it breaks in half and forms two molecules of retinal (vitamin A), which is a precursor to the pigment in the retina responsible for vision. The conjugated system of retinal consists of eleven C atoms and one O atom; see the structure of the molecule here: H3C CH3 ÇH3 ÇH3 `CH3 In the ground state of retinal, each level up to n = 6 is occupied by two electrons. Assuming an average inter-nuclear distance of 140 pm, use the particle-in-a-box model to calculate: a. the separation in energy between the ground state and first excited state in which one electron occupies the state with n = 7, and b. the frequency of the radiation required to produce a transition between these two states.
- The quantitative differences in biological activity between the two enantiomers of a compound are sometimes quite large. For example, the D isomer of the drug isoproterenol, used to treat mild asthma, is 50 to 80times more effective as a bronchodilator than the L isomer. Identify the chiral center in isoproterenol. Why do the two enantiomers have such radically different bioactivity?N2(g) deltaH(kj/mol)=0, deltaG(kj/mol)=0, S(J/mol K)=1891.6 H2(g) deltaH=0, deltaG=0, S=130.7 NH3(g) deltaH=-46.1, deltaG=-16.5, S=192.5Assign R or S configurations to all stereocenters
- Compare the two possible chair conformations of this molecule. Given the AG for the two possible chair conformations, calculate the equilibrium constant for the interconversion between the two chair conformers at room temperature. CI H3C AG = 1.3 kcal/mol %3D AG = -RT In K %3D rearranges to K = e-AG/RT %3D R = 1.987 x 10-3 kcal/molK ||1. Determine the R/S configuration of all stereocenters in the following molecules: OH CI CH3 OHIndicate the stereochemical configuration for the tetrahedral center. OR H OH not a configuration center S Indicate the stereochemical configuration for the tetrahedral center. H₂N H S not a configuration center OR