Ammonia → HCID 11426958, compound

At 50° C., 3.1 g (20 mmol) of 3-methyl-2-naphthylamline, 6.5 g (40 mmol) of FeCl3 and 80 mL of H2O were stirred for 2 hours. To the reaction mixture was added 2 mL of concentrated hydrochloric acid at room temperature. The mixture was stirred at room temperature for 10 minutes. To the reaction mixture were added 20 mL of methylene chloride and 20 mL of a saturated aqueous ammonia solution. After vigorous stirring at room temperature, the reaction mixture was filtered over Celite and the filtrate was washed with methylene chloride. The organic layer was concentrated by distilling off the solvent under reduced pressure. The residue was purified by Florisil (trade name) and then by chromatography on a silica gel column (hexane/ethyl acetate=4/1 to 3/1). By recrystallization from hexane-chloroform, 0.76 g (yield: 24%) of 3,3′-dimethyl-1,1′-binaphthyl-2,2′-diamine was obtained.

1. stirringAfter vigorous stirring at room temperature
2. filtrationthe reaction mixture was filtered over Celite
3. washthe filtrate was washed with methylene chloride
4. concentrationThe organic layer was concentrated
5. distillationby distilling off the solvent under reduced pressure
6. customThe residue was purified by Florisil (trade name)
7. customBy recrystallization from hexane-chloroform

ORD record

ord-a451b3d06f9c48a79c2f92d906dbc2bd

Source dataset

uspto-grants-2003_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06596887B2