Carbazole → 9-(4'-Bromo-4-biphenylyl)carbazole

Temperatur

155 °C

A mixture of carbazole (300 mg, 1.81 mmol), 4,4′-dibromobiphenyl (846 mg, 2.71 mmol), copper (344 mg, 5.43 mmol), 18-crown-6 (187 mg, 0.71 mmol), potassium carbonate (750 mg, 5.43 mmol), and anhydrous N, N-dimethylformamide (10 ml) was degassed for 30 minutes. The mixture was heated at about 155° C. for 66 hours under argon. After being cooled to RT, the mixture was poured into methylene chloride (400 ml) and the subsequent mixture was filtered. The filtrate was loaded on silica gel. A flash column (silica, 10% methylene chloride in hexane) and reprecipitation in methylene chloride/hexanes yielded 304 mg (42% yield) of pure product 10; confirmed by HNMR.

1. customwas degassed for 30 minutes
2. temperatureAfter being cooled to RT
3. additionthe mixture was poured into methylene chloride (400 ml)
4. filtrationthe subsequent mixture was filtered
5. customA flash column (silica, 10% methylene chloride in hexane) and reprecipitation in methylene chloride/hexanes

ORD-Eintrag

ord-996690afcc394b7794d45b47536b8389

Quelldatensatz

uspto-grants-2013_04

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08426040B2