D-glucose
- Primary sugar used in metabolism to generate ATP
- D-mannose & D-glucose are diastereomers: not mirror images, differ in spatial arrangement of atoms at C2
- D-mannose & D-glucose are epimers: only differ at one stereocenter, C2
Instructions for drawing D-glucose:
- Once again draw a vertical chain of six carbons.
- Label the carbon atoms 1-6 from top to bottom.
- To carbon 1, add a carbonyl group and a hydrogen atom.
- To carbon 2, 4 and 5, add a hydrogen atom on the left and a hydroxyl group on the right.
- For carbon 3, add a hydroxyl group on the left and a hydrogen atom on the right.
- Finally, on carbon 6, add two hydrogen atoms and a hydroxyl group.
- Indicate that this molecule is D-glucose, the primary sugar used in metabolism to generate ATP.