Q. 13.25 - An Introduction to General, Organic, and Biological Chemistry

Question

Draw the Fischer projections for D-glucose and L-glucose.

Step-by-Step Solution

Answer

The Fischer projections for D-glucose and L-glucose are shown below.

Step 1: Fischer projection

• Fischer projection, a method of representing the third-dimensional structures of molecules on a page, was devised in the manner of Emil Fischer.
• By convention, horizontal traces constitute bonds projecting from the aircraft of the paper towards the viewer, and vertical traces constitute bonds projecting far from the viewer. 

Step 2: Enantiomers

• As we recognize D and L Glucose are enantiomers this means that they may be replicate snapshots of every other. 
• D-Glucose is an aldohexose, this means that it has six carbons and an aldehyde organization, and the penultimate hydroxy organization at the proper side.

Step 3: Fischer projection of D-glucose and L-glucose

• In this problem, we have to draw the Fischer projection for the given D-glucose and L-glucose.
• Knowing the shape of D-Glucose we are able to simply alternate each stereogenic middle to get the reflected image, that's L-Glucose, as proven withinside the Figure below.