Draw the structure of the α and β anomers that result from the reaction of methanol and ribose. Are these compounds acetals or hemiacetals?

In its open-chain form, D-mannose, an aldohexose found in orange peels, has the structure shown here. Coil mannose around and draw it in the cyclic hemiacetal ⍺ and β forms.

D-Fructose can form a six-membered cyclic hemiacetal as well as the more prevalent five-membered cyclic form. Draw the α isomer of D-fructose in the six-membered ring.

What are the kind and number of atoms in the ring portion of the Haworth structure of glucose?

Identify each of the following as the α or ß isomer:

a.

The sugar d-gulose is a sweet-tasting syrup.

b. Draw the Haworth structures for α− and β-D-gulose.

Identify the following carbohydrates as the ⍺ or β anomer:

(b)

D-Fructose can also form a six-membered ring. Draw the β anomer of D-fructose in the six-membered ring form.