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When optically pure (R)-2-bromobutane is heated with
Chapter 6, Problem 12P(choose chapter or problem)
When optically pure (R)-2-bromobutane is heated with water, butan-2-ol is the product. The reaction forms twice as much (S)-butan-2-ol as (R)-butan-2-ol. Calculate the e.e. and the specific rotation expected for the product.
Questions & Answers
QUESTION:
When optically pure (R)-2-bromobutane is heated with water, butan-2-ol is the product. The reaction forms twice as much (S)-butan-2-ol as (R)-butan-2-ol. Calculate the e.e. and the specific rotation expected for the product.
ANSWER:
Step 1 of 3
The enantiomeric excess (e.e.) is a method for expressing the relative amounts of enantiomers in a mixture. This can be calculated using the formula as shown below :
e.e. =
100% =
100%
The specific rotation is defined as the rotation found using a 10-cm (1-dm) sample cell and a concentration of 1 g/mL. It is denoted by []. It is calculated using the formula :
[] =
Where, = rotation observed in the polarimeter.
c = concentration in g/mL.
l = length of sample cell in dm(decimeter).