Organic Chemistry III
	Professor Carl C. Wamser
Chem 336 - Spring 2007	Quiz 25

1. (2 points) Show the expected product from the following reactions:

2. (2 points) Write a structure for the alpha-furanose form of D-threose (shown below).

3. (2 points) D-Altrose differs from D-glucose only at positions 2 and 3.
Write the best chair conformation for beta-D-altropyranose.

4. (2 points) D-Ribose is reduced by NaBH4 to an alditol. Write its structure.
One other sugar gives the same alditol - write its structure and name it.

5. (2 points) The sugar below is written in a non-standard form.

Identify the anomeric carbon with *.

Is it alpha or beta?

beta

Is it a reducing sugar?

yes

Describe its structure compared to D-glucose.

opposite stereochemistry (epimer) at C-3 (D-allose)