Dolbier HW Solutions 610

Dolbier HW Solutions 610 - 704 CARBOHYDRATES Cyclization...

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Cyclization gives the a - and b -furanose forms of L -arabinose. In the L series the anomeric hydroxyl is up in the a isomer and down in the b isomer. ( d ) The Fischer projection formula for D -threose is given in the text Figure 25.2. Reorientation of that projection into a form that illustrates its potential for cyclization is shown. Cyclization yields the two stereoisomeric furanose forms. 25.6 ( b ) The Fischer projection and Haworth formula for D -mannose are The Haworth formula is more realistically drawn as the following chair conformation:
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