What is the Fischer structure of fructose?
Its molecular formula is C6H12O6 . It contains the keto group at C-2 and the six carbon atoms are arranged in a straight chain. The Fischer projection of the fructose can be converted into the cyclic structure. Like glucose, fructose has a cyclic structure.
What is the Fischer projection of D glucose?
For Glucose: When the hydroxyl groups on carbons 4 and 5 are to the right side of the fischer projection, glucose is D- configuration. When the hydroxyl groups on carbons 4 and 5 are to the left side of the fischer projection, glucose is L-sugar.
Is Aldotetrose a monosaccharide?
Definition : A four-carbon monosaccharide which in its linear form contains either an aldehyde group at position 1 (aldotetrose) or a ketone group at position 2 (ketotetrose). …
What is the difference between L fructose and D fructose?
Fructose can be be both D-fructose and L-fructose based on the orientation of the -OH group in the 5th Carbon. If the 5th Carbon -OH group is on the right side then it is D-fructose. If it is on the left side, then it is L-fructose.
What is Fischer projection with example?
Fischer projection, method of representing the three-dimensional structures of molecules on a page, devised by Emil Fischer. By convention, horizontal lines represent bonds projecting from the plane of the paper toward the viewer, and vertical lines represent bonds projecting away from the viewer.
What is the relationship between D-glucose and D-fructose?
D-glucose and D-fructose are not stereoisomers, because they have different bonding connectivity: glucose has an aldehyde group, while fructose has a ketone. The two sugars do, however, have the same molecular formula, so by definition they are constitutional isomers.
What are the 4 Ketohexoses?
Ketohexoses are six-carbon monosaccharides, which include fructose, psicose, sorbose, and tagatose.
Which sugar is tetrose?
A five-carbon sugar is a pentose and a four-carbon sugar is a tetrose. Sugars are either aldoses or ketoses; an aldose sugar has an aldehyde group (e.g., the C1 of d-glucose seen clearly in the open stick model); a ketose has a ketone group (e.g., the C2 of d-fructose clearly seen in the open stick model).
How do you know if a Fischer projection is D or L?
If the hydroxyl group (or amino group for amino acids) is pointing to the right in the Fischer Projection, the sugar (or amino acid) is designated as D. If the hydroxyl group (or amino group for amino acids) is pointing to the left in the Fischer projection, the sugar (or amino acid) is designated as L.
What is the relationship between D-fructose and L-fructose?
“D- and L-glucose are enantiomers, nonsuperposable mirror-image stereoisomers. Similarly, D- and L-fructose are enantiomers.” If two sugars have every horizontal OH and H pair switched, they are enantiomers.
When is a sugar designated as D in the Fischer projection?
D-Glucose D-Fructose 1 1 2 Carbohydrates and amino acids are designated as D- or L- according to the stereochemistry of the highest numbered carbon in the Fischer projection. If the hydroxyl group (or amino group for amino acids) is pointing to the right in the Fischer Projection, the sugar (or amino acid) is designated as D. If the
How to draw monosaccharide as a Fischer projection?
DRAW THE MONOSACCHARIDE AS A FISCHER PROJECTION IN A VERTICAL FASHION WITH THE OXIDIZED END ON TOP. IF THE HYDROXYL GROUP ON THE BOTTOM CHIRAL ATOM IS ON THE RIGHT, IT IS THE (D)-ISOMER. IF ON THE LEFT, IT IS THE (L)-ISOMER.
Where are the groups on the Fischer projection?
hemiacetal forms, any group on the right-hand side in the Fischer projection will be on the bottom face of the Haworth structure, while all of the groups on the left-hand side of the Fischer projection will be on the top face of the Haworth structure.