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Get Full Access to Organic Chemistry - 8 Edition - Chapter 5 - Problem 13p
Get Full Access to Organic Chemistry - 8 Edition - Chapter 5 - Problem 13p

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# A chemist finds that the addition of (+)-epinephrine to

ISBN: 9780321768414 33

## Solution for problem 13P Chapter 5

Organic Chemistry | 8th Edition

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Problem 13P

A chemist finds that the addition of $$(+)$$ to the catalytic reduction of butan-2-one (Figure 5-16) gives a product that is slightly optically active, with a specific rotation of $$+0.45^{\circ}$$. Calculate the percentages of $$(+)-\text { butan }-2-\text { ol and }(-) \text { butan }-2-\text { ol }$$ formed in this reaction.

Equation Transcription:

Text Transcription:

(+)

+0.45°

(+)-butan-2-ol and (-)butan-2-ol

Step-by-Step Solution:

Solution 13P :

Step 1:

Given :

Observed specific rotation of butan-2-ol = +0.45°.

Percentages of (+)-butan-2-ol and (-)-butan-2-ol formed in this reaction = ?

The rotation of pure butan-2-ol = +13.5 %

We know formula for optical purity :

Optical purity(o.p) = 100 %

Hence , o.p for butan-2-ol  = 100 %

= 3.33 %

Therefore, the o.p of butan-2-ol is 3.33 % which also means that the enantiomeric excess(e.e) is 3.33 % excess  (+) enantiomer over (-) enantiomer.

Step 2 of 3

Step 3 of 3

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