Ethanolamine → N-(2-hydroxyethyl)aminomethylphosphonic acid

A solution of paraformaldehyde (4 g, 0.13 mol), ethanolamine (48.8 g, 0.8 mmol) and triisopropylphosphite (20.8 g, 0.1 mmol) was stirred at 100° C. for 16 hours. The reaction was allowed to cool to room temperature and 8 ml of 50% w/w sodium hydroxide and 100 ml of isopropanol were added. The mixture was heated to reflux for 48 h. The solution was concentrated under vacuum and 25 ml of distilled water was added to homogenize the mixture. The reaction was analyzed by 31P-NMR in D2O at pH=0.7. N-(2-Hydroxylethyl)aminomethylphosphonic acid was obtained in 80% yield.

1. temperatureThe mixture was heated
2. temperatureto reflux for 48 h
3. concentrationThe solution was concentrated under vacuum and 25 ml of distilled water
4. additionwas added

ORD record

ord-fbc5fbcb07894c349bfce169c83d7198

Source dataset

uspto-grants-1997_12

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05703273