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Specific Rotation of (-)-epinephrine/ and Calculation of enantiomeric excess

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1. A solution of 0.5g (-)-epinephrine dissolved in 10mL of dilute HCl was placed in a 20-cm polarimeter tube. Its optical rotation in sodium line (light wavelenth) was -5.0 degrees at 25 degrees Celsius. What is the specific rotation of the (-)-epinephrine?

2. Calculate the enantiomeric excess (e.e.), a measure of optical purity of a substance, and the specific rotation of a mixture containing 6g of (+)-2-butanol and 4g of (-)-2-butanol.

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Solution Summary

The specific rotation of (-)-epinephrine is found. The enantiomeric excess is calculated.