2,6-Bis(3-pyridinyl)benzo[1,2-c:4,5-c']dipyrrole-1,3,5,7-tetrone synthesis

Yield:31663-82-8 75%

Reaction Conditions:

in N,N-dimethyl-formamide at 150; for 6 h;

Steps:

3 Synthesis of raw Lewis base (synthesis and identification of compound 2)

Pyromellitic dianhydride (3.47 g, 15.9 mmol) and 3-aminopyridine (3.0 g, 31.9 mmol) were dissolved in 20 mL of N, N'-dimethylformamide (DMF) in a 200 mL eggplant flask equipped with a reflux tube And refluxed at 150 ° C. for 6 hours. After cooling to room temperature, the resulting precipitate was filtered off to give a yellow solid. This solid was added to a 200 mL egg-plant flask and dissolved in 40 mL of DMF, followed by recrystallization. This recrystallization operation was repeated twice to obtain yellow crystals. The DMF remaining in the crystal was removed by heating in a vacuum oven at 150 ° C. for 12 hours to obtain a yellow powder. (4.44 g, 12.0 mmol yield: 75%).

References:

JP6311093,2018,B2 Location in patent:Paragraph 0060-0063