separation and thermal conversion were previously described (Szabo et al.
The "dextrorotatory isomer" is the stereoisomer
that rotates plane-polarized light to the right (also called the positive (+) enantiomer), and the "levorotatory isomer" is the stereoisomer
that rotates plane-polarized light to the left (also known as the negative (-) enantiomer).
This molecule possesses three centers where stereoisomers
can occur, and the naturally occurring molecule is the D-[alpha]tocopherol (RRR-[alpha]-tocopherol) configuration that has the highest vitamin activity (McDonald et al.
Diastereoselective synthesis of the active stereoisomer
or removal of the antagonistic diastereomer is necessary to provide an active pheromone for pest control.
So, the first product correspond to the isomerization of the terminal double bond, the other products are the two stereoisomers
of the terminal double bond hydrogenation.
Focusing on the commercially available "L"-handed stereoisomer
form of PLA (PLLA), Korean researchers discuss how PLA's slow crystallization speed might be accelerated.
This herbicide is a metolachor stereoisomer
(KURT-KARAKUS et al.
trans-4-Hydroxy-L-proline, a cis-4-hydroxy-L-proline stereoisomer
, has been used for a broad range of applications since an efficient fermentation production method was established by Kyowa Hakko Bio in 1997.
91 ppm), a common stereoisomer
of phytate, was present in all soil extracts at concentrations ranging from 2 to 20 mg P/kg or <1-4% of total extractable P (Table 3).
Then, the hydrogenation of isomaltulose leads to the production of the stereoisomer
, disaccharide alcohol 1-O-[ALPHA]-D-glucopyranosyl-D-mannitol dihydrate (1,1-GPM dihydrate), and 6-O-[alpha]- D-glucopyranosyl-D-sorbitol (1,6-GPS) in an approximate equimolecular mixture.
The d stereoisomer
is the natural form, also named R-alpha lipoic acid.
is an isomer which contains an asymmetric carbon atom bonded to four different groups in which the atoms have the same connectivity, but differ with respect to their three-dimensional orientation.