Reaktion #997024

Reaktionsgleichung

ammonium hydroxide

1,2-phenylenediamine

phthalic acid

→

2,2′-(1,2-Phenylene)bis(1H-benzimidazole)

Lösungsmittel

water

Reaktionsbedingungen

Aufarbeitung

1. 1
   TemperaturAfter heating to 90 C under nitrogen
2. 2
   workup.ADDITIONwere added
3. 3
   TemperaturThe reaction mixture was heated to 180 C for 4 hours
4. 4
   Temperaturcooled to 130 C
5. 5
   TemperaturAfter cooling to 5 C
6. 6
   Filtrationthe product was filtered
7. 7
   Waschenwashed with water
8. 8
   SonstigeAfter drying

Vorschrift

To a flask were added 50 g polyphosphoric acid. After heating to 90 C under nitrogen, a mixture of 2.7 g 1,2-phenylenediamine and 2.1 g phthalic acid were added. The reaction mixture was heated to 180 C for 4 hours, then cooled to 130 C and poured into 150 ml water. The mixture was basified with aqueous ammonium hydroxide. After cooling to 5 C, the product was filtered and washed with water. After drying, 3.3 g of a gray solid remained.

Quelle