Organic Chemistry III
	Professor Carl C. Wamser
Chem 336 - Spring 2006	Quiz 25

1. (2 points) Write the open-chain structure of the following sugar. Is it D or L?

This is L-arabinose.

2. (4 points) D-Arabinose is the C-2 epimer of D-ribose. Write its structure in the following forms.

a) open-chain

b) beta-furanose

c) beta-pyranose (Haworth)

d) beta-pyranose (chair)

3. (4 points) Complete each of the following reactions using STRUCTURES.

a) D-glucose + CH3OH (acid catalyst) -->
( beta-pyranoside chair )

b) sucrose + H2O (acid catalyst) -->
( open-chain forms )

c) D-glyceraldehyde + excess HIO4 -->

d) D-glucose + NaBH4 -->