3-Bromoaniline → (3-Bromophenyl)hydrazine

To a solution of 3-bromo-phenylamine (17 g, 0.1 mol) in concentrated HCl (200 mL) was added an aqueous solution (20 mL) of NaNO2 (7 g, 0.1 mol) at 0° C. and the resulting mixture was stirred for 1 h. A solution of SnCl2.2H2O (45 g, 0.2 mmol) in concentrated HCl (500 mL) was then added at 0° C. The reaction solution was stirred for an additional 2 h at RT. The precipitate was filtered and washed with ethanol and ether to give (3-bromo-phenyl)-hydrazine as a white solid, which was used for the next reaction without further purification

1. stirringThe reaction solution was stirred for an additional 2 h at RT
2. filtrationThe precipitate was filtered
3. washwashed with ethanol and ether

ORD record

ord-33674e58e9e147fda1e224ede4ce668d

Source dataset

uspto-grants-2010_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07737283B2