Water → HCID 178507424, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A homogenous mixture of biphenyl-3,3′,4,4′-tetraamine (500 mg, 2.34 mmol) and 4-aminobenzoic acid (640 mg, 4.67 mmol) was added portionwise to stirred PPA (20 mL) at 200° C. The mixture was stirred at 200° C. for 2.5 h. The mixture was cooled (to <100° C.) and poured into water. The resulting mixture was stirred until a uniform green precipitate had formed. The solid was filtered off and washed with aqueous K2CO3 and water, then dried under suction. The crude product was purified by column chromatography (99:1 EtOAc-NEt3 to 89:10:1 EtOAc-MeOH-NEt3) to afford a yellow solid. This was dissolved in MeOH and 1M HCl, and then concentrated in vacuo. The material was then ground to a fine powder and stirred in aqueous NaHCO3. The solid was filtered, washed with water and dried (vacuum oven) to give the product as a yellow solid (475 mg, 49%).

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