Considering the observed rotation value indicated in the table, and considering that the measurement of this rotation was performed in a 4dm tube, from a 1g/ml solution, calculate: Show calculations a-Specific rotation of this compound. b-Rotation observed for a mixture in which the excess enantiomer of the enantiomer of the substance of the utterance was 50%. observed rotation: +40

Considering the observed rotation value indicated in the table, and considering that the measurement of this rotation was performed in a 4dm tube, from a 1g/ml solution, calculate: Show calculations a-Specific rotation of this compound. b-Rotation observed for a mixture in which the excess enantiomer of the enantiomer of the substance of the utterance was 50%. observed rotation: +40

Macroscale and Microscale Organic Experiments

7th Edition

ISBN:9781305577190

Author:Kenneth L. Williamson, Katherine M. Masters

Publisher:Kenneth L. Williamson, Katherine M. Masters

Chapter56: The Synthesis Of 2,2-dimethyl-1,5-dioxolane; The Acetonide Derivative Of A Vicinal Diol

Section: Chapter Questions

Problem 5Q

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A solution is prepared by dissolving 678 mg of testosterone in 20 mL of ethanol. The sample was placed in a 10 cm long cuvette. The observed rotation of the sample at 25oC is + 13.8o. Calculate the specific turnover of testosterone, show the calculations.
You dilute 1g of an orgainc liquid, with ethanol, to 10mL in a volumertic flask. This solution is analyzed using polarimerty (at 20oC), and an optical rotation of -6.8o is observed. Calculate the specific rotation of the oraginc liquid, if the sample cell that was used was 100nm.
Camphor is optically active. A camphor sample (1.5g) dissolve in ethanol (optically inactive) to a total volume of 50 mL placed in a 5 cm polarimeter sample tube, gives an observed rotation of +0.66° at 20℃ (using the sodium D-line). Calculate and express the specific rotation of camphor
When free in solution (i.e., not bound to opsin), both all-trans and 11-cis retinal have absorption maxima of about 370-380 nm. a. How many electrons can be counted in the conjugated pi-system?b. Using l = 370 nm and the 1D particle in a box model, estimate the effective chain length of the retinal chromophore.
the observed rotation, α, of a 59.9 mg mL-1 solution of an optically-active substance in a 20 cm path length polarimeter was +3.7°. Calculate the value of the specific rotation, [α], in degrees to one decimal place.
The following data was collected for this experiment: A sample of 0.8281 g of phenylsuccinic acid was dissolved in 10 mL of acetone. This sample gave a reading, aobs, of +10.278 deg on the polarimeter. A tube measuring 1 dm was used for the sample. Calculate the enantiomeric excess (EE) of the sample. The literature-specific rotation, [a]lit, of phenylsuccinic acid in acetone is 173 deg. Give your answer to 3 significant figures. Calculate the percent (%) of (+)-phenylsuccinic acid that is in this sample. Give your answer to 3 significant figures. Calculate the percent (%) of (-)-phenylsuccinic acid that is in this sample. Give your answer to 3 significant figures.
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Calculate the specific rotations of the following samples taken at 25 °C using the sodium D line.1.00 g of sample is dissolved in 20.0 mL of ethanol. Then 5.00 mL of this solution is placed in a 20.0-cm polarimeter tube. The observed rotation is 1.25° counterclockwise.
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