Reaktion #997026

Reaktionsgleichung

sodium carbonate

methanesulfonic acid

phosphorus pentoxide

1,2-phenylene diamine

2-bromobenzoic acid

→

off-white solid

Ausbeute 56.7%

2-(2-Bromophenyl)-1H-benzimidazole

Ausbeute 56.7%

Lösungsmittel

Reaktionsbedingungen

Aufarbeitung

1. 1
   Temperaturthe mixture was heated to 60 C under nitrogen until the solids
2. 2
   workup.DISSOLUTIONhad completely dissolved
3. 3
   Temperaturthe mixture was heated to 100 C for 30 minutes
4. 4
   Filtrationfiltration of the solid
5. 5
   Waschenwashing with water
6. 6
   workup.DISSOLUTIONthe crude product was dissolved in 85 ml hot ethanol
7. 7
   Filtrationfiltered
8. 8
   workup.ADDITION9 ml of water was added
9. 9
   TemperaturAfter cooling to 5 C
10. 10
    Filtrationthe product was filtered
11. 11
    Waschenwashed with 50% ethanol
12. 12
    Sonstigedried

Vorschrift

To a flask were added 80 g methanesulfonic acid and 8 g phosphorus pentoxide and the mixture was heated to 60 C under nitrogen until the solids had completely dissolved. To this solution was added 2.7 g 1,2-phenylene diamine and 5.0 g 2-bromobenzoic acid and the mixture was heated to 100 C for 30 minutes. The mixture was poured onto 300 ml ice water and basified with the addition of small portions of sodium carbonate. Following filtration of the solid and washing with water, the crude product was dissolved in 85 ml hot ethanol, filtered and 9 ml of water was added. After cooling to 5 C, the product was filtered and washed with 50% ethanol and dried, giving 3.85 g off-white solid.

Quelle