Question

Draw a Haworth projection of D-glucose and identify it as an α or β anomer.

Short answer

The Haworth projection of D-glucose is as follows:

Step-by-step solution

There are two anomeric forms of cyclic sugars.

The carbonyl carbon, also known as the anomeric carbon, transforms into a chiral centre with two potential configurations when a monosaccharide cycles. Anomers are a pair of stereoisomers that differ in conformation at the anomeric carbon.

The CH₂OH group at the chiral centre, which denotes the D or L confi guration, is on the opposite side of the sugar ring from the OH substituent of the anomeric carbon in the α anomer (C5 in hexoses). The β anomer is the other variation.

Diagram of Haworth projection of D-glucose and identification of α or β anomer.

The sketch showing the Haworth projection of D-glucose as shown below.