Organic Chemistry - Standalone book
Organic Chemistry - Standalone book
10th Edition
ISBN: 9780073511214
Author: Francis A Carey Dr., Robert M. Giuliano
Publisher: McGraw-Hill Education
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Chapter 4.4, Problem 6P
Interpretation Introduction

Interpretation:

The specific rotation of enantiopure cholesterol and the fraction of synthetic cholesterol in the given mixture are to be determined.

Concept introduction:

The specific rotation, denoted by [α], can be calculated from the observed rotation using the following expression:

[α]=100αcl

Where

α is the observed rotation

c is the concentration of the sample in grams per 100 mL of solution

l is the length of the polarimeter tube in decimeters.

The optical purity is equal to the percentage enantiomeric excess, which can be determined from the following expression:

Optical purity=specific rotation of samplespecific rotation of pure enantiomer×100

The percent enantiomeric excess is the difference between the percentages of major and minor enantiomers.

%Enantiomeric excess=(% Major enantiomer)-(% Minor enantiomer)

A racemic mixture is the mixture of equal composition of enantiomers.

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