Question

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81% ent Elements Tables Charts SmartArt Review Paragraph AaBbCcDd Your company, Chiral Synthesis Inc., is looking to procure a supplier of (R)-( 2-phenoxy. propionic acid. A potential supplier, the L.B. Enzyme Company, provided a sample for your inspection. The I.B. Enzyme Company maintains that ther enzymatic generation of (R)-(-). 2 phenoxypropionic acid gives a high quality product that is worth its weight in enzyme. CH, (a) You initially examine the sample using 'H NMR spectroscopy. An NMR spectroscopic analysis of the sample provided by the I.B Enzyme Company gave a spectrum that was consistent with 2 phenoxypropionic acid. Identify the hydrogens responsible for each signal in the NMR spectrum. Notice that each type of phenyl hydrogen gives a discernable signal and therefore can be assigned.)3 points) (b) B Enzyme Company claims that their product was of high purity, you wanted to confirm that it was the (R) enantiomer. (Does the I.B. Enzyme Company know their lest from their right) You thus carried out a polarimetry analysis. (3 points) path length: 1.0 dm temperature: 25.0°C 0.960 g/mL λ-599 nm 〔Na D-line) Determine the value of the observed optical rotation from the following scale: 20 10 0.5 0.0 0.5 (e) Is it the (R) enantiomer Briefly justify your answer 2 Points) (c) Using the data from problem 2b, determine the specific rotation of the sample. (3 points) (e) The specific rotation for the crantomencally pure (R)-( 2-phenoxypropionic acid is 16.4°. Calculate the percent optical yieldl3 points) ayout View Sec 1 Pages: 9 of 10 Words: 1057 of 1074

Answer 1

a) the peaks can be assigned as COOH hydrogenAromatic Hydrogen CH3 Hydrogen O-CH hydrogen

b) Reading not clear

c) If the reading is negative then it will be R enantiomer

d) The specific rotation will be

specific rotation = optical rotation / path length x concentration