week 5 - 1 - Week 5 July 19, 2010 An Introduction to...

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Week 5 July 19, 2010 An Introduction to Carbohydrates What is a carbohydrate ? Why are carbohydrates important? Draw the structures ( without stereochemistry, for now) of the following carbohydrates. Where are each of these carbohydrates found in nature? glucose (2,3,4,5,6-pentahdyroxyhexanal) fructose (1,3,4,5,6-pentahydroxyhexan-2-one) 2-deoxyribose (3,4,5-trihydroxypentanal) These monosaccharides usually exist as a more stable cyclic hemiac etal . What are the cyclic hemia cetal forms of glucose and fructose? (Both form 6-membered rings.) Reading : Section 27.2 71
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July 19, 2010 Stereochemistry of Carbohydrates Let’s “figure out” the stereochemistry of D -glucose by using the following facts: 1. The terminal carbon (#5) has the R -configuration (this is related to the D designation). 2. In the 6-membered ring form, all of the substituents are equatorial . The stereochemistry of carbohydrates is often shown using a Fischer projection . Draw a Fischer projection that shows the correct stereochemistry for glucose. Reading
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week 5 - 1 - Week 5 July 19, 2010 An Introduction to...

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