Haworth Structure of Glucose:
The two anomeric forms (α and β) of D (+) glucose have been assigned pyranose ring structures by Haworth. Pyran is a six-membered heterocyclic ring containing an oxygen atom. The two cyclic structures for D (+) glucose are shown in the pyranose form.
Haworth Structure of Fructose:
Haworth has purposed furanose ring structures for the two anomeric forms of D (-) fructose. Furan is a five-membered heterocyclic ring with an oxygen atom. This forms the basis of the two cyclic structures of D (-) fructose known as α – D (-) fructofuranose and β – D (-) fructofuranose.
