Hydrochloric Acid → 2-Phenylpropylamine hydrochloride

Temperature

57 °C

To an autoclave hydrogenation apparatus under nitrogen was charged water-wet 5% palladium on carbon (453 g), ethanol (6.36 L), 2-phenylpropionitrile (636 g, 4.85 moles) and finally concentrated (12 M) hydrochloric acid (613 g, 5.6 mole). The mixture was stirred rapidly and pressurized to 75-78 psi with hydrogen. The mixture was then heated to 50-64° C. for 3 hours. 1H NMR analysis of an aliquot showed less than 5% starting material. The reaction mixture was depressurized and filtered to afford two lots of filtrate that were concentrated under reduced pressure to ˜400 mL each. To each lot was added methyl tert-butyl ether (MTBE) (2.2 L each) and the precipitated solids were allowed to stir overnight. Each lot was filtered and the collected solids were each washed with fresh MTBE (100 mL) and dried overnight. The lots were combined to afford 2-phenyl-1-propylamine HCl (634.4 g, 76.2%) as a white powder.

1. filtrationfiltered
2. customto afford two lots of filtrate that
3. concentrationwere concentrated under reduced pressure to ˜400 mL each
4. additionTo each lot was added methyl tert-butyl ether (MTBE) (2.2 L each)
5. stirringto stir overnight
6. filtrationEach lot was filtered
7. washeach washed with fresh MTBE (100 mL)
8. customdried overnight

ORD record

ord-0c158c1dc2bd467394f277adf0496885

Source dataset

uspto-grants-2004_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06803484B2