Potassium Hydroxide → Potassium hydrogentartrate

Temperature

60 °C

L-AzeOH-D-tartrate (14.0 g; 56 mmol; prepared analogously to the methods described in international patent application WO 97/02441) was added to water (17 mL) at room temperature. The mixture was heated to 60° C. and an additional amount of water (9 mL) was added to completely dissolve the L-AzeOH-D-tartrate. KOH (10.8 mL; 5.7 M) was added over 7 minutes to resultant the yellowish solution. The reaction mixture was then left to cool at room temperature. It was left at this temperature overnight. The reaction mixture was then cooled on ice for 7 h. Potassium hydrogen tartrate crystallised and was filtered off. The filtration gave potassium hydrogen tartrate as white solid (9.5 g; 91%) and a slightly yellowish aqueous solution containing liberated L-AzeOH. The latter was used in the next step without further characterisation.

1. customprepared analogously to the methods
2. waitThe reaction mixture was then left
3. temperatureto cool at room temperature
4. temperatureThe reaction mixture was then cooled on ice for 7 h
5. customPotassium hydrogen tartrate crystallised
6. filtrationwas filtered off
7. filtrationThe filtration

ORD record

ord-b6db85cf19ac41b7b345bd512ecc3e68

Source dataset

uspto-grants-2003_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06548680B1