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Propionic acid, first analysis

CR y)-2-Amino-3-(3-hydroxy-l,2,5-thiadiazol-4-yl)propionic acid 42 was resolved into the (—)- and (+)-enantiomers using a semipreparative Crownpak CR(+)-column (150 x 10mm2) equipped with a Crownpak CR(+) guard column (10 x 4.0 mm2) (Daicel). The column was eluted at 0 °C (ice bath) with aqueous trifluoroacetic acid (TFA) (pH 2.0) at 1.5 mlmin-1. After removal of the acidic mobile phase, the pure enantiomers could be crystallized as zwitterions with high ee (99.9%) <2002BMC2259>. The first eluted (—)-enantiomer has the ////-configuration as proved by an X-ray crystallographic analysis. [Pg.525]

Quantitative amino acid analysis can be used to determine the loading of a resin. Following esterification of the first amino acid, the amino acid-resin is hydrolyzed with a 12 N HCl-propionic acid (1 1) solution for 90 min at... [Pg.64]

See other pages where Propionic acid, first analysis is mentioned: [Pg.107]    [Pg.231]    [Pg.560]    [Pg.665]    [Pg.795]    [Pg.311]    [Pg.118]    [Pg.175]    [Pg.795]    [Pg.126]    [Pg.310]    [Pg.178]    [Pg.4]    [Pg.421]    [Pg.39]    [Pg.447]    [Pg.238]    [Pg.171]    [Pg.426]    [Pg.96]    [Pg.59]    [Pg.59]    [Pg.253]    [Pg.253]    [Pg.66]    [Pg.59]    [Pg.190]    [Pg.16]    [Pg.679]    [Pg.694]    [Pg.890]    [Pg.253]    [Pg.225]    [Pg.300]    [Pg.353]    [Pg.419]   
See also in sourсe #XX -- [ Pg.14 ]



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