| Mar 19 2022 9:45AM |
Normal |
Acknowledged |
http://www.chemspider.com/Chemical-Structure.5735.html
The name of this compound doesn't seem correct.
In my impression, all amino acids(except Glycene) is levorotation(-), so shouldn't the compound be L-(-)-Alanine?
The L/D notation can be confusing – L amino acids are not necessarily levorotatory. See this explanation (from https://chem.libretexts.org/Bookshelves/Biological_Chemistry/Supplemental_Modules_(Biological_Chemistry)/Proteins/Amino_Acids/Properties_of_Amino_Acids/Stereochemistry_of_Amino_Acids):
"All common amino acids are the L-enantiomer (i.e. their Cα chiral center is the L-enantiomer), based on the structural comparison with L-glyceraldehyde. However, not all L-amino acids are Levorotatory, some are actually Dextrorotatory with regard to their optical activity. To (attempt) to avoid confusion, the optical activities are given as (+) for dextrorotatory, and (-) for levorotatory
L(+)-alanine (this is the L-enantiomer and it is dextrorotatory)
L(-)-serine (this is the L-enantiomer and it is levorotatory)" |