3-Fluoroaniline → HCID 12832310, compound

Participants

Reaction Steps

5.49 g of 3-fluoroaniline is dissolved in 6.0 g of concentrated sulfuric acid and 120 ml of water and, after the addition of 10 g of ice, diazotized at 0° with a solution of 3.6 g of sodium nitrite in 10 ml of water. The diazonium salt solution is then neutralized with sodium acetate and introduced at 5° under thorough agitation into a solution of 17.2 g of 4,5-bis(4-methoxyphenyl)-2-mercaptoimidazole in 700 ml of dimethylformamide. The mixture is agitated for another 20 minutes, poured into 2.5 l of water, extracted with ethyl acetate, the organic solution washed with water, dried over sodium sulfate, and concentrated to dryness under vacuum. The residue is chromatographed on 500 g of neutral aluminum oxide (activity stage II). Elution with ethyl acetate/hexane produces 7.24 g of 4,5-bis(4-methoxyphenyl)-2-(3-fluorophenylthio)imidazole, mp 147°-149° after recrystallization from ether/ethyl acetate.

Provenance & Evidence