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

1.  (5 points)  D-Lyxose is the aldopentose that differs from D-ribose at C2 and C3.
Write structures for D-lyxose in all of the following forms.

a)  open-chain

b)  alpha-furanose

c)  beta-pyranose (Haworth form)

d) beta-pyranose (two equilibrating chair forms)

2.  (2 points)  Write a disaccharide formed from

alpha-D-ribopyranose alpha-1  joined to  C-6  of  beta-D-fructofuranose

3.  (3 points)  Complete the following reactions by adding the appropriate structures as requested.