Question

1) Draw and name the following monosaccharides

a) Anomer of β-D-allose

b) Enantiomer of D-allose

c) The pyranose and furanose forms of D-allose

d) The epimer of D-galactose (either the α or β anomer)

e) One of β-D-allose diasteroisomer

f) the corresponding aldopentose of D-allose with the same stereochemistry at each chiral center

2) Determine the relationship between the following pairs of sugars (anomers, enantioners, epimers, diasteroisomers, aldose and ketose pair, others (define the relationship):

a) D-mannose and D-altrose

b) D-Arabinose and D-ribulose

c) D-Mannose and L-Mannose

d) 2-deoxy-α-D-ribose and D-ribose

e) Fructose and sucrose

f) β-D-galactopyranose and α-D-galactopyranose

g) α-D-glucopyranose and α-D-glucofuranose

h) D-fructose and D-sorbose.

Answer 1

solution:

1)

2)

D-mannose and D-altrose ---------->  Diasteroisomers

D-Arabinose and D-ribulose ---------------> aldose and ketose pair

D-Mannose and L-Mannose-------------> enantiomer

2-deoxy-α-D-ribose and D-ribose ------------> epimers

Fructose and sucrose-----------------------> isomer

β-D-galactopyranose and α-D-galactopyranose -----------> Anomers

α-D-galactopyranose and α-D-galactofuranosepyranose/furanose------> form of the same sugar