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Unformatted text preview: O OH CH 2 OH OH CH 2 OH O L--sugar D--sugar 4) Finally, OH groups on the right go below the ring and those on the left above, using the CH 2 OH group as the reference point for both projections. O OH H H OH H OH OH H H CH 2 OH H OH H CH 2 OH H OH OH H O L--sugar D--sugar Method 2 This method involves memorizing both the Fischer and Haworth projections of glucose, then determining all other structures relative to it. First produce the two structures of -D-glucose. CHO OH HO OH OH CH 2 OH O OH OH OH OH CH 2 OH-D-glucose If you remember that the CH 2 OH group is up, then all you have to do is recall that the OH groups follow an alternating pattern from it. You then compare the position of the OH groups on the Fischer projection of the sugar you are interested in with that of glucose to place the OH groups. Those on the same side go in the same position, those on the opposite side go in the opposite position....
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- Spring '07