Haworth Projections From Fischer Projections Chemical Worksheet printable pdf download

Haworth Projections From Fischer Projections Chemical Worksheet

How to draw Haworth Projections from Fischer Projections

Consider the following Fischer projections. If you look at the chiral carbon furthest from the carbonyl group – the

one marked with a star here – you can decide if the sugar is D (the —OH on the right) or L (the —OH on the left).

L-Aldohexose

D-Aldopentose

1. Draw the basic structure of the sugar; to do this, count the number of C atoms from the carbonyl to the furthest

chiral C plus one oxygen and find out if you will need a ring with six or five atoms.

a pyranose ring

a furanose ring

2. If the sugar is a D-sugar place a —CH

OH above the ring on the carbon to the left of the oxygen, for an L-sugar

place it below the ring.

L-sugar

D-sugar

3. The different anomers: For an α-sugar place an —OH below the ring on the carbon at the right of the oxygen

(this is the anomeric carbon), for a β-sugar place the —OH above the ring.

L-α-sugar

D-β-sugar

4. Finally, —OH groups pointing to the right on the Ficher Projection go below the ring, and those on the left

above. Keep in mind that the —OH on the furthest chiral carbon has gone. (It reacted to form the ring.)

Reyes

Haworth Projections From Fischer Projections Chemical Worksheet