A pyranose with the hydroxyl group on the anomeric carbon pointing up in the haworth structure is designated by alpha .
When aldohexoses undergo cyclization, anomers are formed. Anomers differ in the spatial position of the -OH group at [tex]C_{1}[/tex] . When the -OH group is positioned along the direction of [tex]-CH_{2} OH[/tex] , alpha anomer exists but when the -OH group is positioned opposite to the direction of the[tex]-CH_{2} OH[/tex] , then we have the beta anomer. Consider the alpha and beta anomers of galactopyranose and a pyranose with the hydroxyl group on the anomeric carbon pointing up in the haworth structure is given as ,
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