反应详情

2.98 g (20 mmol) of p-dimethylaminobenzaldehyde are added to a solution of 3.24 g (20 mmol) of 1,3-diamino-2-ethylimidazolium chloride in 180 ml of glacial acetic acid. The mixture is stirred at room temperatured for 50 hours, the precipitated 1,3-bis[[p-(dimethylamino)benzylidene]amino]-2-ethylimidazolium chloride is then filtered off and washed with ethanol. The mother liquor is evaporated and the residue is placed on a column loaded with 200 g of silica gel (particle size: 0.063-0.200 mm). By elution with methylene chloride/methanol (9:1 v/v) there is obtained a further portion of 1,3-bis[[p-(dimethylamino)benzylidene]amino]-2-ethyl-imidazolium chloride.

1. filtrationthe precipitated 1,3-bis[[p-(dimethylamino)benzylidene]amino]-2-ethylimidazolium chloride is then filtered off
2. washwashed with ethanol
3. customThe mother liquor is evaporated
4. washBy elution with methylene chloride/methanol (9:1 v/v) there