Reacción #1397

Ecuación de reacción

potassium hydroxide

4-aminobiphenyl

4-iodo-ortho-xylene

→

above product

Rendimiento 70.0%

N,N-bis(3,4-dimethylphenyl)-4-biphenylamine

Rendimiento 70.0%

Disolventes

toluene

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroIn a 250 milliliter round-bottomed flask equipped with mechanical stirrer
2. 2
   Otrofitted with a Dean-Stark trap under a reflux condenser
3. 3
   Temperaturamaintained at this temperature for 4 hours
4. 4
   Otrothe reaction
5. 5
   Otroto attain room temperature, about 25° C.
6. 6
   Otrowas partitioned between 200 milliliters of toluene and 150 milliliters of deionized water
7. 7
   OtroThe resulting organic layer was separated
8. 8
   Otrowater was removed by azeotropic distillation of water under a Dean-Stark trap
9. 9
   workup.ADDITIONtreating the toluene solution with 36 grams of Filtrol-24™
10. 10
    Temperaturaat reflux
11. 11
    Temperaturathe solution was cooled to room temperature
12. 12
    Filtraciónfiltered
13. 13
    OtroThe product of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine was recovered from the filtrate by evaporation of the solvent
14. 14
    OtroRecrystallization from 40 milliliters of a one
15. 15
    workup.ADDITIONto one mixture of ethylacetate-isopropanol

Procedimiento

In a 250 milliliter round-bottomed flask equipped with mechanical stirrer and fitted with a Dean-Stark trap under a reflux condenser were placed 8.46 grams (0.05 mole) of 4-aminobiphenyl, 25.53 grams (0.11 mole) of 4-iodo-ortho-xylene, 0.25 gram (0.0025 mole) of cuprous chloride, 0.45 gram (0.0025 mole) of 1,10-phenanthroline, 22.4 grams (0.4 mole) of flake potassium hydroxide and 30 milliliters of toluene solvent. The reaction was heated quickly to a reflux temperature of 130° C. and maintained at this temperature for 4 hours, after which time chromatographic analysis revealed the reaction to be complete. The reaction mixture was allowed to attain room temperature, about 25° C., and was partitioned between 200 milliliters of toluene and 150 milliliters of deionized water. The resulting organic layer was separated and water was removed by azeotropic distillation of water under a Dean-Stark trap. The product was decolorized by slurry treating the toluene solution with 36 grams of Filtrol-24™, an acid-washed clay, and 24 grams of Alcoa CG-20 alumina. After 3 hours stirring at reflux, the solution was cooled to room temperature and filtered. The product of N,N-bis(3,4-dimethylphenyl)-4-biphenylamine was recovered from the filtrate by evaporation of the solvent. Recrystallization from 40 milliliters of a one to one mixture of ethylacetate-isopropanol provided 13.2 grams (70 percent) of the above product. Chromatographic analysis by high performance liquid chromatography illustrated an excellent product purity of 99.8 percent and a melting temperature, which was determined by differential scanning calorimetry to be 113.21° C.

Fuente