Question

Draw both pyranose anomers of each aldohexose using a three-dimensional representation with a chair pyranose. Label each anomers as $\mathbf{\alpha }\mathbf{}\mathbf{and}\mathbf{}\mathbf{\beta }$.

(a.)

(b.)

Short answer

Answer

(a.)

and

(b.)

and

Step-by-step solution

Pyranose

Pyranose is a hexagonal ring having five carbons and one oxygen atom in a ring.The only difference between alpha ($\mathrm{\alpha }$)and beta ($\mathrm{\beta }$) anomers is the OH group at C1 carbon. $\left(\mathbf{\alpha }\right)$means downward OH and$\left(\mathbf{\beta }\right)$ means upward OH.

3-D representation with a chair pyranose of a

The OH group at the C5 carbon is on the right side, which is D sugar. The group will come in an upward position. The $\mathbf{\alpha }\mathbf{}\mathrm{and}\mathbf{\beta }$anomers of part (a) are shown as,

Pyranose anomers of aldohexose a

3-D representation with a chair pyranose of b

It is a D-sugar because the OH at C5 is on the right side. So, group will come in the upward position. The $\mathbf{\alpha }\mathbf{}\mathrm{and}\mathbf{\beta }$anomers in part (b) is shown as,

Pyranose anomers of aldohexose b