3-Amino-1-propanol → N-(3-Hydroxypropyl)-2-propenamide

To a 250 mL, four-neck round bottom flask equipped with a mechanical stirrer, a thermometer, a 100 mL dropping funnel, and a nitrogen inlet/outlet, 30.0 g of 1-amino-3-propanol (0.4 mole), and 100 mL of acetonitrile were added. The mixture was cooled below 0° C. with an ice/water bath. To this solution, 18.1 g of freshly distilled acryloyl chloride (0.2 mole) in 50 mL of acetonitrile was added through the dropping funnel. The addition rate was controlled so that the reaction temperature was kept below 0° C. After the addition was finished and the agitation was turned off, the reaction solution separated into two liquid phases. The bottom layer viscous salt solution phase was discarded. To the top layer acetonitrile solution phase, 100 mL of deionized water was added. After removing all acetonitrile by vacuum distillation, the aqueous solution was passed through a mixed bed ion-exchange column packed with 20 g of Dowex MR-3C resin. A total of 76 grams of eluate was collected. The final solution has the following properties: HPLC and FT-IR analysis indicates there is no ester formation; HPAA concentration: 7.2% (wt/wt); pH=5.6 at 25° C; Conductivity=56.6 μS/cm at 25° C.; Viscosity=1.1 cPs at 25° C. The relative low yield of HPAA is due to the fact that HPAA is soluble in the salt phase. HPAA in the salt phase can be recovered by acetone extraction since HPAA is soluble in acetone, and the salt is insoluble.

1. customTo a 250 mL, four-neck round bottom flask equipped with a mechanical stirrer
2. temperatureThe mixture was cooled below 0° C. with an ice/water bath
3. customwas kept below 0° C
4. additionAfter the addition
5. customthe reaction solution separated into two liquid phases
6. additionTo the top layer acetonitrile solution phase, 100 mL of deionized water was added
7. customAfter removing all acetonitrile
8. distillationby vacuum distillation
9. customA total of 76 grams of eluate was collected
10. customat 25° C
11. customat 25° C.
12. customat 25° C
13. customHPAA in the salt phase can be recovered by acetone extraction since HPAA

ORD record

ord-52d57c2bed654da9a61f3f907e2b74ec

Source dataset

uspto-grants-2000_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06117293