2-(2-Bromophenoxy)-1-phenylethan-1-one → 7-Bromo-3-phenylbenzofuran
Reaktionsgleichung
[Br:1][C:2]1[CH:17]=[CH:16][CH:15]=[CH:14][C:3]=1[O:4][CH2:5][C:6]([C:8]1[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=1)=O>O>[Br:1][C:2]1[C:3]2[O:4][CH:5]=[C:6]([C:8]3[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=3)[C:14]=2[CH:15]=[CH:16][CH:17]=1Komponenten
3
Edukt 1
Produkt 1
Reagenzien, Katalysatoren, Lösungsmittel 1
Versuchsvorschrift
Polyphosphoric acid (4200 g.) and alpha-(2-bromophenoxy)acetophenone from Example 1 (596 g., 2.05 mole) are heated and stirred well at about 120° to 125° C. internal temperature for four hours. The reaction mixture is then poured into stirred ice and water (about 8 l. total volume) to give a suspension of white solid. The solid is collected and washed with water, cold dilute sodium hydroxide solution and water until the wash is neutral. The solid is recrystallized from hexane to give white crystals of 7-bromo-3-phenylbenzofuran, m.p. 72°-74° C.
Aufarbeitung
- additionThe reaction mixture is then poured