Ultrafast chiral chromatography enables high throughput enantiopurity analysis (over one thousand samples in an 8 h workday) for enantioselective synthesis investigations.
The anticoagulant activities of 6-, 7-, 8-, 4′-hydroxy, 6-chloro- and 6-bromowarfarin were determined in rabbits after intraperitoneal administration of 16.2 μmol kg−1 over 96 h. Substitution on the 4-hydroxycoumarin moiety resulted in reduction of the anticoagulant activity. 6-Chlorowarfarin was more potent than 6-bromowarfarin suggesting that the molecular size of 4-hydroxycoumarin moiety may be crucial for biological activity.