Online Organic Chemistry Tutor | Organic Chemistry Help

D, L Notation System

D, L Notation System

D, L Notation System

D, L Notation System

In organic chemistry D and L notations are used specifically in sugars and amino acids. In sugars the position of the hydroxyl group at second last carbon determines whether it is D sugar or L sugar. If the hydroxyl group is on the right side on that carbon then it is called D-sugar if it is on the left side, then it is named L-sugars. In amino acids only, glycine is achiral remaining all amino acids are chiral, and their configuration is determined by the location of amino group (-NH2) on alpha carbon of amino acid, if it is on right side it is called D- amino acid and if it is on left side then it is called L-amino acids. All the chiral amino acids obtained from proteins have L configuration.

Capital “D” and “L” notations has no connection with small “d” (dextro) and “l” (levo) notation which are used to represents dextrorotatory and levorotatory compounds in organic chemistry.

 

Share the Post:

Related Posts