Determine the relationship between each of the following pairs of structures (enantiomers, diastereomers, or meso compounds). Н. А НО H CH3 ОН CH₂CH3 and Н. ОН -ОН H CH3 H H CH3 -ОН CH3 ОН and Н НО CH3 -ОН -Н CH3
Carbohydrates
Carbohydrates are the organic compounds that are obtained in foods and living matters in the shape of sugars, cellulose, and starch. The general formula of carbohydrates is Cn(H2O)2. The ratio of H and O present in carbohydrates is identical to water.
Starch
Starch is a polysaccharide carbohydrate that belongs to the category of polysaccharide carbohydrates.
Mutarotation
The rotation of a particular structure of the chiral compound because of the epimerization is called mutarotation. It is the repercussion of the ring chain tautomerism. In terms of glucose, this can be defined as the modification in the equilibrium of the α- and β- glucose anomers upon its dissolution in the solvent water. This process is usually seen in the chemistry of carbohydrates.
L Sugar
A chemical compound that is represented with a molecular formula C6H12O6 is called L-(-) sugar. At the carbon’s 5th position, the hydroxyl group is placed to the compound’s left and therefore the sugar is represented as L(-)-sugar. It is capable of rotating the polarized light’s plane in the direction anticlockwise. L isomers are one of the 2 isomers formed by the configurational stereochemistry of the carbohydrates.
One of the best notations to use while comparing two compound structures is the Fisher projection.
The second pair of structures is already given in Fisher projection. So we need to change only first pair of compounds.
Important points to remember :
i) Always keep the same groups in the top and bottom positions in both compounds.
ii) Rotating a whole molecule is allowed in fisher projection.
iii) You can rotate any carbon center by any angle in any representation or keeping one bond static rotates other bonds.
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