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Answer 1 · 2016-12-27T03:34:25

Here's one way to do it.

Draw the Fischer projection of your sugar, e.g. glucose.

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Now, rotate the Fischer projection 90° clockwise.

Next, draw a template for a Haworth structure.

Template

Look at the #"OH"# groups on carbons, 2, 3, and 4 of the Fischer projection.

Those on the right will be "down" in the Haworth structure. Those on the left will be "up".

If the sugar is a D-sugar, the #"CH"_2"OH"# group will be "up".

The OH on carbon 1 can be "down" for the α-anomer or "up" for the β-anomer.

And you have the Haworth structure of glucose.