Reaktion #640556

Reaktionsgleichung

4,4′-dibromobenzil

o-phenylenediamine

→

2,3-bis(4-bromophenyl)quinoxaline

Ausbeute 92.0%

Lösungsmittel

chloroform

Reaktionsbedingungen

Aufarbeitung

1. 1
   WaschenThe reaction solution was washed with water
2. 2
   Temperaturafter being cooled to room temperature
3. 3
   ExtraktionAn aqueous layer was extracted with chloroform
4. 4
   Waschenwashed with a saturated saline solution
5. 5
   TrocknenThe organic layer was dried over magnesium sulfate
6. 6
   Filtrationfiltered
7. 7
   Sonstigecondensed

Vorschrift

A chloroform solution (200 mL) of 30.0 g (81.5 mmol) of 4,4′-dibromobenzil and 9.00 g (83.2 mmol) of o-phenylenediamine was heated and refluxed at 80° C. for 3 hours under nitrogen atmosphere. The reaction solution was washed with water after being cooled to room temperature. An aqueous layer was extracted with chloroform. This extracted aqueous layer and an organic layer were put together and washed with a saturated saline solution. The organic layer was dried over magnesium sulfate and filtered. The filtrate was condensed to obtain 33 g (yield: 92%) of objective 2,3-bis(4-bromophenyl)quinoxaline as a white solid. Synthetic scheme of Step 1 is shown in the following (d-1).

Quelle