5-Nitro-1,3-benzenediamine → 1,3,5-Triaminobenzene

Temperature

80 °C

5-nitro-m-phenylenediamine (100.0 g) was dissolved in acetone (100 ml) and insolubles were filtered off by means of suction. 15.0 g of activated carbon was added into the solution, after stirring for 5 minutes it was removed by suction filtration. The solution was concentrated till crystals were slightly deposited, and 200 ml of water was added. The precipitated solids were filtered by means of suction, and dried under a reduced pressure to obtain 68.5 g of purified 5-nitro-m-phenylenediamine. The purified 5-nitro-m-phenylenediamine (55.0 g), platinum/carbon (5%) (1.06 g) and dioxane (580 ml) were placed in a tightly closed vessel and stirred at the rate of 851 rpm under a hydrogen pressure of 1 to 4 kg/cm2 at 80° C. Hydrogen absorption was ceased within 25 minutes, and the mixture was stirred further one hour at 80° C. followed by left to cool. After filtering off the catalyst, the mixture was concentrated to 250 ml, then added with n-hexane (250 ml), and the white precipitate produced were filtered off. This white solid was washed with n-hexane and dried to obtain 1,3,5-triaminobenzene (39 g). The yield was 88%.

1. customHydrogen absorption
2. stirringthe mixture was stirred further one hour at 80° C.
3. waitby left
4. temperatureto cool
5. filtrationAfter filtering off the catalyst
6. concentrationthe mixture was concentrated to 250 ml
7. additionadded with n-hexane (250 ml)
8. customthe white precipitate produced
9. filtrationwere filtered off
10. washThis white solid was washed with n-hexane
11. customdried

ORD record

ord-bc02434b248045f68c81c57f7c86d740

Source dataset

uspto-grants-1988_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04761234