Organic Chemistry
Organic Chemistry
12th Edition
ISBN: 9781118875766
Author: T. W. Graham Solomons, Craig B. Fryhle, Scott A. Snyder
Publisher: WILEY
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Chapter 5, Problem 52P

Tartaric acid [ H O 2 C C H ( O H ) C H ( O H ) C O 2 H ] was an important compound in the history of stereochemistry. Two naturally occurring forms of tartaric acid arc optically inactive. One optically inactive form has a melting point of 210-212 °C, the ocher a melting point of 140°C. The Inactive tartaric acid with a melting point of 210-212°C can be separated into two optically active forms of tartaric acid with the same melting point (16S-170°C). One optically active tartaric acid has [ α ] D 25 = + 12 , and the other, [ α ] D 25 = 12 . All attempts to separate the other inactive tartaric acid (melting point 140°C) into optically active compounds fail.

(a) Write the three-dimensional structure of the tartaric acid with melting point 140°C.

(b) Write structures for the optically active tartaric acids with melting points of 168-170°C.

(c) Can you determine from the formulas which tartaric acid in (b) has a positive rotation and which has a negative rotation?

(d) What is the nature of the form of tartaric acid with a melting point of 210-212°C?

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