Water → 1,2-Bis(3-chlorophenyl)hydrazine

Temperature

60 °C

To a stirred solution of 50% NaOH (3 mL) was added 3-chloronitrobenzene (10 g, 64 mM). The suspension was warmed to 60° C. and zinc (9 g, 138 mM) was added. During the addition, the temperature of the reaction mixture was kept between 60° and 80° C. After the addition was complete, a solution of 20% NaOH (18 mL, 90 mM) was added followed by water (30 mL). An additional portion of zinc (12 g, 189 mM) was then added and the resulting mixture was stirred between 75°-80° C. for 2 hours. After cooling to room temperature, the mixture was added to ether (200 mL), stirred, and the liquid was decanted. The solids were then resuspended in ether and the extraction was repeated 3 times. The ether extracts were combined, dried (Na2SO4), and concentrated to give a yellow solid. This was purified by flash column chromatography using CH2Cl2 as elutant which afforded the titled compound as a yellow solid (5.5 g, 68%). NMR (CDCl3): 7.12 (t, J=8 Hz, 2H), 6.80 (m, 4H), 6.67 (dd, J1 =1 Hz, J2 =8 Hz, 2H), 5.66 (br s, 2H).

1. additionDuring the addition
2. customwas kept between 60° and 80° C
3. additionAfter the addition
4. temperatureAfter cooling to room temperature
5. stirringstirred
6. customthe liquid was decanted
7. extractionthe extraction
8. dry with materialdried (Na2SO4)
9. concentrationconcentrated
10. customto give a yellow solid
11. customThis was purified by flash column chromatography

ORD record

ord-849d6f9dce954ca088376be8c11a50e5

Source dataset

uspto-grants-1997_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05652239