O-Phenylenediamine → 2,3-Bis(4-fluorophenyl)quinoxaline

Participants

Reaction Steps

First, 3.71 g of 4,4′-difluorobenzil and 1.71 g of o-phenylenediamine were stirred on heating in a solvent (200 mL of chloroform) for 6 hours. The reaction solution was cooled to a room temperature, washed with 1 mol/L hydrochloric acid and a saturated aqueous solution of sodium chloride, and dried with magnesium sulfate. The solvent was removed to obtain a ligand 2,3-bis(4-fluorophenyl)quinoxaline) (abbreviation: HFdpq) (pale yellow powder, yield: 99%). A synthetic scheme (b-1) of Step 1 is shown below.

Provenance & Evidence